Merge 5c25848810 into 36b5559b99

Co-authored-by: Daniel <1767914+iamdanielv@users.noreply.github.com>
Co-authored-by: Pascal Getreuer <getreuer@google.com>
Co-authored-by: Pascal Getreuer <50221757+getreuer@users.noreply.github.com>

builddefs/common_features.mk

@@ -215,7 +215,7 @@ else
         COMMON_VPATH += $(PLATFORM_PATH)/$(PLATFORM_KEY)/$(DRIVER_DIR)/flash
         COMMON_VPATH += $(DRIVER_PATH)/flash
         SRC += eeprom_driver.c eeprom_legacy_emulated_flash.c legacy_flash_ops.c
-      else ifneq ($(filter $(MCU_SERIES),STM32F1xx STM32F3xx STM32F4xx STM32L4xx STM32G4xx WB32F3G71xx WB32FQ95xx GD32VF103),)
+      else ifneq ($(filter $(MCU_SERIES),STM32F1xx STM32F3xx STM32F4xx STM32L4xx STM32G4xx WB32F3G71xx WB32FQ95xx AT32F415 GD32VF103),)
         # Wear-leveling EEPROM implementation, backed by MCU flash
         OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_WEAR_LEVELING
         SRC += eeprom_driver.c eeprom_wear_leveling.c

builddefs/generic_features.mk

@@ -36,6 +36,7 @@ GENERIC_FEATURES = \
     HAPTIC \
     KEY_LOCK \
     KEY_OVERRIDE \
+    LAYER_LOCK \
     LEADER \
     MAGIC \
     MOUSEKEY \

data/constants/keycodes/keycodes_0.0.6_quantum.hjson

@@ -3,5 +3,12 @@
         "0x7C20": "!delete!", // old QK_OUTPUT_AUTO
         "0x7C21": "!delete!", // old QK_OUTPUT_USB
         "0x7C22": "!delete!", // old QK_OUTPUT_BLUETOOTH
+        "0x7C7B": {
+            "group": "quantum",
+            "key": "QK_LAYER_LOCK",
+            "aliases": [
+                "QK_LLCK"
+            ]
+        }
     }
 }

data/mappings/info_config.hjson

@@ -64,6 +64,9 @@
     "WEAR_LEVELING_BACKING_SIZE": {"info_key": "eeprom.wear_leveling.backing_size", "value_type": "int", "to_json": false},
     "WEAR_LEVELING_LOGICAL_SIZE": {"info_key": "eeprom.wear_leveling.logical_size", "value_type": "int", "to_json": false},
 
+    // Layer locking
+    "LAYER_LOCK_IDLE_TIMEOUT": {"info_key": "layer_lock.timeout", "value_type": "int"},
+
     // Indicators
     "LED_CAPS_LOCK_PIN": {"info_key": "indicators.caps_lock"},
     "LED_NUM_LOCK_PIN": {"info_key": "indicators.num_lock"},

data/schemas/keyboard.jsonschema

@@ -92,6 +92,7 @@
                 "GD32VF103",
                 "WB32F3G71",
                 "WB32FQ95",
+                "AT32F415",
                 "atmega16u2",
                 "atmega32u2",
                 "atmega16u4",
@@ -216,6 +217,7 @@
             "type": "string",
             "enum": [
                 "apm32-dfu",
+                "at32-dfu",
                 "atmel-dfu",
                 "bootloadhid",
                 "caterina",
@@ -373,6 +375,12 @@
             }
         },
         "keycodes": {"$ref": "qmk.definitions.v1#/keycode_decl_array"},
+        "layer_lock": {
+            "type": "object",
+            "properties": {
+                "timeout": {"$ref": "qmk.definitions.v1#/unsigned_int"}
+            }
+        },
         "layout_aliases": {
             "type": "object",
             "additionalProperties": {"$ref": "qmk.definitions.v1#/layout_macro"}

docs/_sidebar.json

@@ -123,6 +123,7 @@
                     { "text": "Key Lock", "link": "/features/key_lock" },
                     { "text": "Key Overrides", "link": "/features/key_overrides" },
                     { "text": "Layers", "link": "/feature_layers" },
+                    { "text": "Layer Lock", "link": "/features/layer_lock" },
                     { "text": "One Shot Keys", "link": "/one_shot_keys" },
                     { "text": "OS Detection", "link": "/features/os_detection" },
                     { "text": "Raw HID", "link": "/features/rawhid" },

docs/compatible_microcontrollers.md

@@ -57,6 +57,10 @@ You can also use any ARM chip with USB that [ChibiOS](https://www.chibios.org) s
  * [WB32F3G71xx](http://www.westberrytech.com)
  * [WB32FQ95xx](http://www.westberrytech.com)
 
+### Artery (AT32)
+
+ * [AT32F415](https://www.arterychip.com/en/product/AT32F415.jsp)
+
 ### NXP (Kinetis)
 
  * [MKL26Z64](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/kl-series-cortex-m0-plus/kinetis-kl2x-72-96-mhz-usb-ultra-low-power-microcontrollers-mcus-based-on-arm-cortex-m0-plus-core:KL2x)

docs/driver_installation_zadig.md

@@ -98,6 +98,7 @@ The device name here is the name that appears in Zadig, and may not be what the
 |`bootloadhid` |HIDBoot                       |`16C0:05DF`   |HidUsb |
 |`usbasploader`|USBasp                        |`16C0:05DC`   |libusbK|
 |`apm32-dfu`   |APM32 DFU ISP Mode            |`314B:0106`   |WinUSB |
+|`at32-dfu`    |AT32 Bootloader DFU           |`2E3C:DF11`   |WinUSB |
 |`stm32-dfu`   |STM32 BOOTLOADER              |`0483:DF11`   |WinUSB |
 |`gd32v-dfu`   |GD32V BOOTLOADER              |`28E9:0189`   |WinUSB |
 |`kiibohd`     |Kiibohd DFU Bootloader        |`1C11:B007`   |WinUSB |

docs/feature_layers.md

@@ -17,6 +17,9 @@ These functions allow you to activate layers in various ways. Note that layers a
 * `TO(layer)` - activates *layer* and de-activates all other layers (except your default layer). This function is special, because instead of just adding/removing one layer to your active layer stack, it will completely replace your current active layers, uniquely allowing you to replace higher layers with a lower one. This is activated on keydown (as soon as the key is pressed).
 * `TT(layer)` - Layer Tap-Toggle. If you hold the key down, *layer* is activated, and then is de-activated when you let go (like `MO`). If you repeatedly tap it, the layer will be toggled on or off (like `TG`). It needs 5 taps by default, but you can change this by defining `TAPPING_TOGGLE` -- for example, `#define TAPPING_TOGGLE 2` to toggle on just two taps.
 
+See also the [Layer Lock key](features/layer_lock), which locks the highest
+active layer until pressed again.
+
 ### Caveats {#caveats}
 
 Currently, the `layer` argument of `LT()` is limited to layers 0-15, and the `kc` argument to the [Basic Keycode set](keycodes_basic), meaning you can't use keycodes like `LCTL()`, `KC_TILD`, or anything greater than `0xFF`. This is because QMK uses 16-bit keycodes, of which 4 bits are used for the function identifier and 4 bits for the layer, leaving only 8 bits for the keycode.

docs/features/layer_lock.md

@@ -0,0 +1,139 @@
+# Layer Lock
+
+Some [layer switches](../feature_layers#switching-and-toggling-layers) access
+the layer by holding the key, including momentary layer `MO(layer)` and layer
+tap `LT(layer, key)` keys. You may sometimes need to stay on the layer for a
+long period of time. Layer Lock "locks" the current layer to stay on, supposing
+it was accessed by one of:
+
+ * `MO(layer)` momentary layer switch
+ * `LT(layer, key)` layer tap
+ * `OSL(layer)` one-shot layer
+ * `TT(layer)` layer tap toggle
+ * `LM(layer, mod)` layer-mod key (the layer is locked, but not the mods)
+
+Press the Layer Lock key again to unlock the layer. Additionally, when a layer
+is locked, layer switch keys that turn off the layer such as `TO(other_layer)`
+will unlock it.
+
+
+## How do I enable Layer Lock
+
+In your rules.mk, add:
+
+```make
+LAYER_LOCK_ENABLE = yes
+```
+
+Pick a key in your keymap on a layer you intend to lock, and assign it the
+keycode `QK_LAYER_LOCK` (short alias `QK_LLCK`). Note that locking the base
+layer has no effect, so typically, this key is used on layers above the base
+layer.
+
+
+## Example use
+
+Consider a keymap with the following base layer.
+
+![Base layer with a MO(NAV) key.](https://i.imgur.com/DkEhj9x.png)
+
+The highlighted key is a momentary layer switch `MO(NAV)`. Holding it accesses a
+navigation layer.
+
+![Nav layer with a Layer Lock key.](https://i.imgur.com/2wUZNWk.png)
+
+
+Holding the NAV key is fine for brief use, but awkward to continue holding when
+using navigation functions continuously. The Layer Lock key comes to the rescue:
+
+1. Hold the NAV key, activating the navigation layer.
+2. Tap Layer Lock.
+3. Release NAV. The navigation layer stays on.
+4. Make use of the arrow keys, etc.
+5. Tap Layer Lock or NAV again to turn the navigation layer back off.
+
+A variation that would also work is to put the Layer Lock key on the base layer
+and make other layers transparent (`KC_TRNS`) in that position. Pressing the
+Layer Lock key locks (or unlocks) the highest active layer, regardless of which
+layer the Layer Lock key is on.
+
+
+## Idle timeout
+
+Optionally, Layer Lock may be configured to unlock if the keyboard is idle
+for some time. In config.h, define `LAYER_LOCK_IDLE_TIMEOUT` in units of
+milliseconds:
+
+```c
+#define LAYER_LOCK_IDLE_TIMEOUT 60000  // Turn off after 60 seconds.
+```
+
+
+## Functions
+
+Use the following functions to query and manipulate the layer lock state.
+
+| Function                   | Description                        |
+|----------------------------|------------------------------------|
+| `is_layer_locked(layer)`   | Checks whether `layer` is locked.  |
+| `layer_lock_on(layer)`     | Locks and turns on `layer`.        |
+| `layer_lock_off(layer)`    | Unlocks and turns off `layer`.     |
+| `layer_lock_invert(layer)` | Toggles whether `layer` is locked. |
+
+
+## Representing the current Layer Lock state
+
+There is an optional callback `layer_lock_set_user()` that gets called when a
+layer is locked or unlocked. This is useful to represent the current lock state
+for instance by setting an LED. In keymap.c, define
+
+```c
+bool layer_lock_set_user(layer_state_t locked_layers) {
+  // Do something like `set_led(is_layer_locked(NAV));`
+  return true;
+}
+```
+
+The argument `locked_layers` is a bitfield in which the kth bit is on if the kth
+layer is locked. Alternatively, you can use `is_layer_locked(layer)` to check if
+a given layer is locked.
+
+
+## Combine Layer Lock with a mod-tap
+
+It is possible to create a [mod-tap MT key](../mod_tap) that acts as a modifier
+on hold and Layer Lock on tap. Since Layer Lock is not a [basic
+keycode](../keycodes_basic), attempting `MT(mod, QK_LLCK)` is invalid does not
+work directly, yet this effect can be achieved through [changing the tap
+function](../mod_tap#changing-tap-function). For example, the following
+implements a `SFTLLCK` key that acts as Shift on hold and Layer Lock on tap:
+
+```c
+#define SFTLLCK LSFT_T(KC_0)
+
+// Use SFTLLCK in your keymap...
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {
+        case SFTLLCK:
+            if (record->tap.count) {
+                if (record->event.pressed) {
+                    // Toggle the lock on the highest layer.
+                    layer_lock_invert(get_highest_layer(layer_state));
+                }
+                return false;
+            }
+            break;
+
+        // Other macros...
+    }
+    return true;
+}
+```
+
+In the above, `KC_0` is an arbitrary placeholder for the tapping keycode. This
+keycode will never be sent, so any basic keycode will do. In
+`process_record_user()`, the tap press event is changed to toggle the lock on
+the highest layer. Layer Lock can be combined with a [layer-tap LT
+key](../feature_layers#switching-and-toggling-layers) similarly.
+

docs/flashing.md

@@ -345,6 +345,39 @@ Flashing sequence:
 3. Flash a .bin file
 4. Reset the device into application mode (may be done automatically)
 
+## AT32 DFU
+
+All AT32 MCUs come preloaded with a factory bootloader that cannot be modified nor deleted.
+
+To ensure compatibility with the AT32-DFU bootloader, make sure this block is present in your `rules.mk`:
+
+```make
+# Bootloader selection
+BOOTLOADER = at32-dfu
+```
+
+Compatible flashers:
+
+* [dfu-util](https://dfu-util.sourceforge.net/) / `:dfu-util` target in QMK (recommended command line)
+  ```
+  dfu-util -a 0 -d 2E3C:DF11 -s 0x8000000:leave -D <filename>
+  ```
+
+Flashing sequence:
+
+1. Enter the bootloader using any of the following methods:
+    * Tap the `QK_BOOT` keycode
+    * If a reset circuit is present, tap the `RESET` button on the PCB; some boards may also have a toggle switch that must be flipped
+    * Otherwise, you need to bridge `BOOT0` to VCC (via `BOOT0` button or jumper), short `RESET` to GND (via `RESET` button or jumper), and then let go of the `BOOT0` bridge
+2. Wait for the OS to detect the device
+3. Flash a .bin file
+4. Reset the device into application mode (may be done automatically)
+
+### `make` Targets
+
+* `:dfu-util`: Waits until an AT32 bootloader device is available, and then flashes the firmware.
+* `:dfu-util-split-left` and `:dfu-util-split-right`: Flashes the firmware as with `:dfu-util`, but also sets the handedness setting in EEPROM.
+
 ## tinyuf2
 
 Keyboards may opt into supporting the tinyuf2 bootloader. This is currently only supported on F303/F401/F411.

docs/keycodes.md

@@ -387,6 +387,14 @@ See also: [Key Lock](features/key_lock)
 |---------|--------------------------------------------------------------|
 |`QK_LOCK`|Hold down the next key pressed, until the key is pressed again|
 
+## Layer Lock {#layer-lock}
+
+See also: [Layer Lock](features/layer_lock)
+
+|Key            |Aliases  |Description                       |
+|---------------|---------|----------------------------------|
+|`QK_LAYER_LOCK`|`QK_LLCK`|Locks or unlocks the highest layer|
+
 ## Layer Switching {#layer-switching}
 
 See also: [Layer Switching](feature_layers#switching-and-toggling-layers)

docs/porting_your_keyboard_to_qmk.md

@@ -4,52 +4,51 @@ This page describes the support for [Compatible Microcontrollers](compatible_mic
 
 If you have not yet you should read the [Keyboard Guidelines](hardware_keyboard_guidelines) to get a sense of how keyboards fit into QMK.
 
-
 QMK has a number of features to simplify working with keyboards. For most, you don't have to write a single line of code. To get started, run `qmk new-keyboard`:
 
 ```
 $ qmk new-keyboard
 Ψ Generating a new QMK keyboard directory
 
-Name Your Keyboard Project
-For more infomation, see:
-https://docs.qmk.fm/hardware_keyboard_guidelines#naming-your-keyboardproject
+Ψ Name Your Keyboard Project
+Ψ For more information, see:
+https://docs.qmk.fm/hardware_keyboard_guidelines#naming-your-keyboard-project
+Keyboard Name? mycoolkeeb
+Ψ Attribution
+Ψ Used for maintainer, copyright, etc.
+Your GitHub Username? [jsmith] 
+Ψ More Attribution
+Ψ Used for maintainer, copyright, etc.
+Your Real Name? [John Smith] 
+Ψ Pick Base Layout
+Ψ As a starting point, one of the common layouts can be used to
+bootstrap the process
+Default Layout?
+    1. 60_abnt2
+    ...
+    65. none of the above
+Please enter your choice: [65] 
+Ψ What Powers Your Project
+Ψ Is your board using a separate development board, such as a Pro Micro,
+or is the microcontroller integrated onto the PCB?
 
-keyboard Name? mycoolkeeb
-
-Attribution
-Used for maintainer, copyright, etc
-
-Your GitHub Username?  [jsmith] 
-
-More Attribution
-Used for maintainer, copyright, etc
-
-Your Real Name?  [John Smith] 
-
-Pick Base Layout
-As a starting point, one of the common layouts can be used to bootstrap the process
-
-Default Layout? 
-	1. 60_ansi
-...
-	50. tkl_iso
-	51. none of the above
-Please enter your choice:  [51] 
-
-What Powers Your Project
-For more infomation, see:
-https://docs.qmk.fm/#/compatible_microcontrollers
-
-MCU? 
-	1. atmega32u4
-...
-	22. STM32F303
-Please enter your choice:  [12]
+For more information, see:
+https://docs.qmk.fm/compatible_microcontrollers
+Using a Development Board? [y/n] y
+Ψ Select Development Board
+Ψ For more information, see:
+https://docs.qmk.fm/compatible_microcontrollers
+Development Board?
+    1. bit_c_pro
+    ...
+    14. promicro
+    ...
+    18. svlinky
+Please enter your choice: [14] 
 Ψ Created a new keyboard called mycoolkeeb.
-Ψ To start working on things, `cd` into keyboards/mycoolkeeb,
-Ψ or open the directory in your preferred text editor.
-Ψ And build with qmk compile -kb mycoolkeeb -km default.
+Ψ Build Command: qmk compile -kb mycoolkeeb -km default.
+Ψ Project Location: /Users/jsmith/qmk_firmware/keyboards/mycoolkeeb.
+Ψ Now update the config files to match the hardware!
 ```
 
 This will create all the files needed to support your new keyboard, and populate the settings with default values. Now you just need to customize it for your keyboard.
@@ -58,13 +57,13 @@ This will create all the files needed to support your new keyboard, and populate
 
 This is where you'll describe your keyboard. Please follow the [Keyboard Readme Template](documentation_templates#keyboard-readmemd-template) when writing your `readme.md`. You're encouraged to place an image at the top of your `readme.md`, please use an external service such as [Imgur](https://imgur.com) to host the images.
 
-## `info.json`
+## `keyboard.json`
 
-The `info.json` file is where you configure the hardware and feature set for your keyboard. There are a lot of options that can be placed in that file, too many to list here. For a complete overview of available options see the [Data Driven Configuration Options](reference_info_json) page.
+The `keyboard.json` file is where you configure the hardware and feature set for your keyboard. There are a lot of options that can be placed in that file, too many to list here. For a complete overview of available options see the [Data Driven Configuration Options](reference_info_json) page.
 
 ### Hardware Configuration
 
-At the top of the `info.json` you'll find USB related settings. These control how your keyboard appears to the Operating System. If you don't have a good reason to change you should leave the `usb.vid` as `0xFEED`. For the `usb.pid` you should pick a number that is not yet in use.
+At the top of the `keyboard.json` you'll find USB related settings. These control how your keyboard appears to the Operating System. If you don't have a good reason to change you should leave the `usb.vid` as `0xFEED`. For the `usb.pid` you should pick a number that is not yet in use.
 
 Do change the `manufacturer` and `keyboard_name` lines to accurately reflect your keyboard.
 
@@ -82,10 +81,11 @@ Do change the `manufacturer` and `keyboard_name` lines to accurately reflect you
 Windows and macOS will display the `manufacturer` and `keyboard_name` in the list of USB devices. `lsusb` on Linux instead prefers the values in the list maintained by the [USB ID Repository](http://www.linux-usb.org/usb-ids.html). By default, it will only use `manufacturer` and `keyboard_name` if the list does not contain that `usb.vid` / `usb.pid`. `sudo lsusb -v` will show the values reported by the device, and they are also present in kernel logs after plugging it in.
 :::
 
-
 ### Matrix Configuration
 
-The next section of the `info` file deals with your keyboard's matrix. The first thing you should define is which pins on your MCU are connected to rows and columns. To do so simply specify the names of those pins:
+The next section of the `keyboard.json` deals with your keyboard's matrix. The first thing you should define is which pins on your MCU are connected to rows and columns. To do so simply specify the names of those pins:
+
+#### Diode Matrix
 
 ```json
     "matrix_pins": {
@@ -94,7 +94,7 @@ The next section of the `info` file deals with your keyboard's matrix. The first
     },
 ```
 
-The size of the `matrix_pins.cols` and `matrix_pins.rows` arrays infer the size of the matrix (previously `MATRIX_ROWS` and `MATRIX_COLS`). 
+The matrix dimensions are inferred from the length of the `matrix_pins.cols` and `matrix_pins.rows` arrays (previously specified explicitly in `config.h` with `MATRIX_ROWS` and `MATRIX_COLS`).
 
 Finally, you can specify the direction your diodes point. This can be `COL2ROW` or `ROW2COL`.
 
@@ -103,54 +103,56 @@ Finally, you can specify the direction your diodes point. This can be `COL2ROW`
 ```
 
 #### Direct Pin Matrix
-To configure a keyboard where each switch is connected to a separate pin and ground instead of sharing row and column pins, use `matrix_pins.direct`. The mapping defines the pins of each switch in rows and columns, from left to right. The size of the `matrix_pins.direct` array infers the size of the matrix. Use `NO_PIN` to fill in blank spaces. Overrides the behaviour of `diode_direction`, `matrix_pins.cols` and `matrix_pins.rows`.
+
+To configure a keyboard where each switch is connected to a separate pin and ground instead of sharing row and column pins, use `matrix_pins.direct`. This overrides the behaviour of `diode_direction`, `matrix_pins.cols` and `matrix_pins.rows`, and they should not be specified together.
 
 ```json
     "matrix_pins": {
         "direct": [
-            ["F1", "E6", "B0", "B2", "B3" ],
-            ["F5", "F0", "B1", "B7", "D2" ],
-            ["F6", "F7", "C7", "D5", "D3" ],
-            ["B5", "C6", "B6", "NO_PIN", "NO_PIN"]
+            ["F1", "E6", "B0", "B2", "B3"],
+            ["F5", "F0", "B1", "B7", "D2"],
+            ["F6", "F7", "C7", "D5", "D3"],
+            ["B5", "C6", "B6", null, null]
         ]
     },
 ```
 
-### Layout macros
+Here, the matrix dimensions are inferred directly from the dimensions of the `matrix_pins.direct` array. Since there are no row or column pins to prescribe the matrix dimensions, you can arrange it however you like. Each "row" must contain the same number of "column"s; use `null` to fill in blank spaces, but try to minimize them.
 
-Next is configuring Layout Macro(s). These define the physical arrangement of keys, and its position within the matrix that a switch are connected to. This allows you to have a physical arrangement of keys that differs from the wiring matrix.
+### Layout Macros
+
+Next is configuring layout macro(s). These define the physical arrangement of keys, and their position within the matrix that switches are connected to. This allows you to have a physical arrangement of keys that differs from the wiring matrix.
 
 ```json
     "layouts": {
         "LAYOUT_ortho_4x4": {
             "layout": [
-                { "matrix": [0, 0], "x": 0, "y": 0 },
-                { "matrix": [0, 1], "x": 1, "y": 0 },
-                { "matrix": [0, 2], "x": 2, "y": 0 },
-                { "matrix": [0, 3], "x": 3, "y": 0 },
-                { "matrix": [1, 0], "x": 0, "y": 1 },
-                { "matrix": [1, 1], "x": 1, "y": 1 },
-                { "matrix": [1, 2], "x": 2, "y": 1 },
-                { "matrix": [1, 3], "x": 3, "y": 1 },
-                { "matrix": [2, 0], "x": 0, "y": 2 },
-                { "matrix": [2, 1], "x": 1, "y": 2 },
-                { "matrix": [2, 2], "x": 2, "y": 2 },
-                { "matrix": [2, 3], "x": 3, "y": 2 },
-                { "matrix": [3, 0], "x": 0, "y": 3 },
-                { "matrix": [3, 1], "x": 1, "y": 3 },
-                { "matrix": [3, 2], "x": 2, "y": 3 },
-                { "matrix": [3, 3], "x": 3, "y": 3 }
+                {"matrix": [0, 0], "x": 0, "y": 0},
+                {"matrix": [0, 1], "x": 1, "y": 0},
+                {"matrix": [0, 2], "x": 2, "y": 0},
+                {"matrix": [0, 3], "x": 3, "y": 0},
+                {"matrix": [1, 0], "x": 0, "y": 1},
+                {"matrix": [1, 1], "x": 1, "y": 1},
+                {"matrix": [1, 2], "x": 2, "y": 1},
+                {"matrix": [1, 3], "x": 3, "y": 1},
+                {"matrix": [2, 0], "x": 0, "y": 2},
+                {"matrix": [2, 1], "x": 1, "y": 2},
+                {"matrix": [2, 2], "x": 2, "y": 2},
+                {"matrix": [2, 3], "x": 3, "y": 2},
+                {"matrix": [3, 0], "x": 0, "y": 3},
+                {"matrix": [3, 1], "x": 1, "y": 3},
+                {"matrix": [3, 2], "x": 2, "y": 3},
+                {"matrix": [3, 3], "x": 3, "y": 3}
             ]
         }
     }
-
 ```
 
-In the above example, 
+In the above example,
 
 * `LAYOUT_ortho_4x4` defines the name of the layout macro
   * It must conform to the [layout guidelines](hardware_keyboard_guidelines#keyboard-name-h)
-* `"matrix": [0, 0]` defines the electrical position
+* `"matrix": [0, 0]` defines the matrix row and column that the key is associated with
 
 ::: tip
 See also: [Split Keyboard Layout Macro](features/split_keyboard#layout-macro) and [Matrix to Physical Layout](understanding_qmk#matrix-to-physical-layout-map).
@@ -158,9 +160,10 @@ See also: [Split Keyboard Layout Macro](features/split_keyboard#layout-macro) an
 
 ## Additional Configuration
 
-There are a lot of features that can be turned on or off, configured or tuned. Some of these have yet to be migrated over to [Data Driven Configuration](data_driven_config). The following sections cover the process for when an `info.json` option is unavailable.
+There are a lot of features that can be turned on or off, configured or tuned. Some of these have yet to be migrated over to [Data Driven Configuration](data_driven_config). The following sections cover the process for when a data-driven option is unavailable.
 
 ### Configuration Options
+
 For available options for `config.h`, you should see the [Config Options](config_options#the-configh-file) page for more details.
 
 ### Build Options

keyboards/handwired/onekey/at_start_f415/board.h

@@ -0,0 +1,10 @@
+// Copyright 2023-2024 HorrorTroll <https://github.com/HorrorTroll>
+// Copyright 2023-2024 Zhaqian <https://github.com/zhaqian12>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include_next <board.h>
+
+#undef AT32F415KB
+#define AT32F415RC

keyboards/handwired/onekey/at_start_f415/config.h

@@ -0,0 +1,10 @@
+// Copyright 2023-2024 HorrorTroll <https://github.com/HorrorTroll>
+// Copyright 2023-2024 Zhaqian <https://github.com/zhaqian12>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define ADC_PIN A0
+
+#define BACKLIGHT_PWM_DRIVER PWMD5
+#define BACKLIGHT_PWM_CHANNEL 1

keyboards/handwired/onekey/at_start_f415/halconf.h

@@ -0,0 +1,13 @@
+// Copyright 2023-2024 HorrorTroll <https://github.com/HorrorTroll>
+// Copyright 2023-2024 Zhaqian <https://github.com/zhaqian12>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define HAL_USE_ADC TRUE
+
+#define HAL_USE_I2C TRUE
+
+#define HAL_USE_PWM TRUE
+
+#include_next <halconf.h>

keyboards/handwired/onekey/at_start_f415/keyboard.json

@@ -0,0 +1,20 @@
+{
+    "keyboard_name": "Onekey AT-START-F415",
+    "processor": "AT32F415",
+    "bootloader": "at32-dfu",
+    "usb": {
+        "shared_endpoint": {
+            "keyboard": true
+        }
+    },
+    "matrix_pins": {
+        "cols": ["B3"],
+        "rows": ["B4"]
+    },
+    "backlight": {
+        "pin": "A0"
+    },
+    "ws2812": {
+        "pin": "B0"
+    }
+}

keyboards/handwired/onekey/at_start_f415/mcuconf.h

@@ -0,0 +1,16 @@
+// Copyright 2023-2024 HorrorTroll <https://github.com/HorrorTroll>
+// Copyright 2023-2024 Zhaqian <https://github.com/zhaqian12>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include_next <mcuconf.h>
+
+#undef AT32_ADC_USE_ADC1
+#define AT32_ADC_USE_ADC1 TRUE
+
+#undef AT32_I2C_USE_I2C1
+#define AT32_I2C_USE_I2C1 TRUE
+
+#undef AT32_PWM_USE_TMR5
+#define AT32_PWM_USE_TMR5 TRUE

keyboards/handwired/onekey/at_start_f415/readme.md

@@ -0,0 +1,3 @@
+# Artery AT-START-F415 Board Onekey
+
+To trigger keypress, short together pins *B3* and *B4*.

lib/python/qmk/cli/new/keyboard.py

@@ -8,7 +8,7 @@ from pathlib import Path
 from dotty_dict import dotty
 
 from milc import cli
-from milc.questions import choice, question
+from milc.questions import choice, question, yesno
 
 from qmk.git import git_get_username
 from qmk.json_schema import load_jsonschema
@@ -131,60 +131,70 @@ def _question(*args, **kwargs):
     return ret
 
 
-def prompt_keyboard():
-    prompt = """{fg_yellow}Name Your Keyboard Project{style_reset_all}
-For more infomation, see:
-https://docs.qmk.fm/hardware_keyboard_guidelines#naming-your-keyboard-project
+def prompt_heading_subheading(heading, subheading):
+    cli.log.info(f"{{fg_yellow}}{heading}{{style_reset_all}}")
+    cli.log.info(subheading)
 
-Keyboard Name? """
+
+def prompt_keyboard():
+    prompt_heading_subheading("Name Your Keyboard Project", """For more information, see:
+https://docs.qmk.fm/hardware_keyboard_guidelines#naming-your-keyboard-project""")
 
     errmsg = 'Keyboard already exists! Please choose a different name:'
 
-    return _question(prompt, reprompt=errmsg, validate=lambda x: not keyboard(x).exists())
+    return _question("Keyboard Name?", reprompt=errmsg, validate=lambda x: not keyboard(x).exists())
 
 
 def prompt_user():
-    prompt = """
-{fg_yellow}Attribution{style_reset_all}
-Used for maintainer, copyright, etc
+    prompt_heading_subheading("Attribution", "Used for maintainer, copyright, etc.")
 
-Your GitHub Username? """
-    return question(prompt, default=git_get_username())
+    return question("Your GitHub Username?", default=git_get_username())
 
 
 def prompt_name(def_name):
-    prompt = """
-{fg_yellow}More Attribution{style_reset_all}
-Used for maintainer, copyright, etc
+    prompt_heading_subheading("More Attribution", "Used for maintainer, copyright, etc.")
 
-Your Real Name? """
-    return question(prompt, default=def_name)
+    return question("Your Real Name?", default=def_name)
 
 
 def prompt_layout():
-    prompt = """
-{fg_yellow}Pick Base Layout{style_reset_all}
-As a starting point, one of the common layouts can be used to bootstrap the process
+    prompt_heading_subheading("Pick Base Layout", """As a starting point, one of the common layouts can be used to
+bootstrap the process""")
 
-Default Layout? """
     # avoid overwhelming user - remove some?
     filtered_layouts = [x for x in available_layouts if not any(xs in x for xs in ['_split', '_blocker', '_tsangan', '_f13'])]
     filtered_layouts.append("none of the above")
 
-    return choice(prompt, filtered_layouts, default=len(filtered_layouts) - 1)
+    return choice("Default Layout?", filtered_layouts, default=len(filtered_layouts) - 1)
+
+
+def prompt_mcu_type():
+    prompt_heading_subheading(
+        "What Powers Your Project", """Is your board using a separate development board, such as a Pro Micro,
+or is the microcontroller integrated onto the PCB?
+
+For more information, see:
+https://docs.qmk.fm/compatible_microcontrollers"""
+    )
+
+    return yesno("Using a Development Board?")
+
+
+def prompt_dev_board():
+    prompt_heading_subheading("Select Development Board", """For more information, see:
+https://docs.qmk.fm/compatible_microcontrollers""")
+
+    return choice("Development Board?", dev_boards, default=dev_boards.index("promicro"))
 
 
 def prompt_mcu():
-    prompt = """
-{fg_yellow}What Powers Your Project{style_reset_all}
-For more infomation, see:
-https://docs.qmk.fm/#/compatible_microcontrollers
+    prompt_heading_subheading("Select Microcontroller", """For more information, see:
+https://docs.qmk.fm/compatible_microcontrollers""")
 
-MCU? """
     # remove any options strictly used for compatibility
-    filtered_mcu = [x for x in (dev_boards + mcu_types) if not any(xs in x for xs in ['cortex', 'unknown'])]
+    filtered_mcu = [x for x in mcu_types if not any(xs in x for xs in ['cortex', 'unknown'])]
 
-    return choice(prompt, filtered_mcu, default=filtered_mcu.index("atmega32u4"))
+    return choice("Microcontroller?", filtered_mcu, default=filtered_mcu.index("atmega32u4"))
 
 
 @cli.argument('-kb', '--keyboard', help='Specify the name for the new keyboard directory', arg_only=True, type=keyboard_name)
@@ -211,7 +221,11 @@ def new_keyboard(cli):
     user_name = cli.config.new_keyboard.name if cli.config.new_keyboard.name else prompt_user()
     real_name = cli.args.realname or cli.config.new_keyboard.name if cli.args.realname or cli.config.new_keyboard.name else prompt_name(user_name)
     default_layout = cli.args.layout if cli.args.layout else prompt_layout()
-    mcu = cli.args.type if cli.args.type else prompt_mcu()
+
+    if cli.args.type:
+        mcu = cli.args.type
+    else:
+        mcu = prompt_dev_board() if prompt_mcu_type() else prompt_mcu()
 
     config = {}
     if mcu in dev_boards:

lib/python/qmk/cli/new/keymap.py

@@ -1,5 +1,6 @@
 """This script automates the copying of the default keymap into your own keymap.
 """
+import re
 import shutil
 
 from milc import cli
@@ -13,6 +14,13 @@ from qmk.keyboard import keyboard_completer, keyboard_folder
 from qmk.userspace import UserspaceDefs
 
 
+def validate_keymap_name(name):
+    """Returns True if the given keymap name contains only a-z, 0-9 and underscore characters.
+    """
+    regex = re.compile(r'^[a-zA-Z0-9][a-zA-Z0-9_]+$')
+    return bool(regex.match(name))
+
+
 def prompt_keyboard():
     prompt = """{fg_yellow}Select Keyboard{style_reset_all}
 If you`re unsure you can view a full list of supported keyboards with {fg_yellow}qmk list-keyboards{style_reset_all}.
@@ -60,6 +68,10 @@ def new_keymap(cli):
         cli.log.error(f'Default keymap {{fg_cyan}}{keymap_path_default}{{fg_reset}} does not exist!')
         return False
 
+    if not validate_keymap_name(user_name):
+        cli.log.error('Keymap names must contain only {fg_cyan}a-z{fg_reset}, {fg_cyan}0-9{fg_reset} and {fg_cyan}_{fg_reset}! Please choose a different name.')
+        return False
+
     if keymap_path_new.exists():
         cli.log.error(f'Keymap {{fg_cyan}}{user_name}{{fg_reset}} already exists! Please choose a different name.')
         return False

lib/python/qmk/cli/painter/convert_graphics.py

@@ -60,9 +60,7 @@ def painter_convert_graphics(cli):
         return
 
     # Work out the text substitutions for rendering the output data
-    args_str = " ".join((f"--{arg} {getattr(cli.args, arg.replace('-', '_'))}" for arg in ["input", "output", "format", "no-rle", "no-deltas"]))
-    command = f"qmk painter-convert-graphics {args_str}"
-    subs = generate_subs(cli, out_bytes, image_metadata=metadata, command=command)
+    subs = generate_subs(cli, out_bytes, image_metadata=metadata, command_name="painter_convert_graphics")
 
     # Render and write the header file
     header_text = render_header(subs)

lib/python/qmk/cli/painter/make_font.py

@@ -61,10 +61,8 @@ def painter_convert_font_image(cli):
         return
 
     # Work out the text substitutions for rendering the output data
-    args_str = " ".join((f"--{arg} {getattr(cli.args, arg.replace('-', '_'))}" for arg in ["input", "output", "no-ascii", "unicode-glyphs", "format", "no-rle"]))
-    command = f"qmk painter-convert-font-image {args_str}"
     metadata = {"glyphs": _generate_font_glyphs_list(not cli.args.no_ascii, cli.args.unicode_glyphs)}
-    subs = generate_subs(cli, out_bytes, font_metadata=metadata, command=command)
+    subs = generate_subs(cli, out_bytes, font_metadata=metadata, command_name="painter_convert_font_image")
 
     # Render and write the header file
     header_text = render_header(subs)

lib/python/qmk/cli/via2json.py

@@ -29,6 +29,7 @@ def _convert_macros(via_macros):
     if len(via_macros) == 0:
         return list()
     split_regex = re.compile(r'(}\,)|(\,{)')
+    macro_group_regex = re.compile(r'({.+?})')
     macros = list()
     for via_macro in via_macros:
         # Split VIA macro to its elements
@@ -38,13 +39,28 @@ def _convert_macros(via_macros):
         macro_data = list()
         for m in macro:
             if '{' in m or '}' in m:
-                # Found keycode(s)
-                keycodes = m.split(',')
-                # Remove whitespaces and curly braces from around keycodes
-                keycodes = list(map(lambda s: s.strip(' {}'), keycodes))
-                # Remove the KC prefix
-                keycodes = list(map(lambda s: s.replace('KC_', ''), keycodes))
-                macro_data.append({"action": "tap", "keycodes": keycodes})
+                # Split macro groups
+                macro_groups = macro_group_regex.findall(m)
+                for macro_group in macro_groups:
+                    # Remove whitespaces and curly braces from around group
+                    macro_group = macro_group.strip(' {}')
+
+                    macro_action = 'tap'
+                    macro_keycodes = []
+
+                    if macro_group[0] == '+':
+                        macro_action = 'down'
+                        macro_keycodes.append(macro_group[1:])
+                    elif macro_group[0] == '-':
+                        macro_action = 'up'
+                        macro_keycodes.append(macro_group[1:])
+                    else:
+                        macro_keycodes.extend(macro_group.split(',') if ',' in macro_group else [macro_group])
+
+                    # Remove the KC prefixes
+                    macro_keycodes = list(map(lambda s: s.replace('KC_', ''), macro_keycodes))
+
+                    macro_data.append({"action": macro_action, "keycodes": macro_keycodes})
             else:
                 # Found text
                 macro_data.append(m)
@@ -54,13 +70,13 @@ def _convert_macros(via_macros):
 
 
 def _fix_macro_keys(keymap_data):
-    macro_no = re.compile(r'MACRO0?([0-9]{1,2})')
+    macro_no = re.compile(r'MACRO0?\(([0-9]{1,2})\)')
     for i in range(0, len(keymap_data)):
         for j in range(0, len(keymap_data[i])):
             kc = keymap_data[i][j]
             m = macro_no.match(kc)
             if m:
-                keymap_data[i][j] = f'MACRO_{m.group(1)}'
+                keymap_data[i][j] = f'MC_{m.group(1)}'
     return keymap_data
 
 

lib/python/qmk/constants.py

@@ -22,7 +22,7 @@ QMK_FIRMWARE_UPSTREAM = 'qmk/qmk_firmware'
 MAX_KEYBOARD_SUBFOLDERS = 5
 
 # Supported processor types
-CHIBIOS_PROCESSORS = 'cortex-m0', 'cortex-m0plus', 'cortex-m3', 'cortex-m4', 'MKL26Z64', 'MK20DX128', 'MK20DX256', 'MK64FX512', 'MK66FX1M0', 'RP2040', 'STM32F042', 'STM32F072', 'STM32F103', 'STM32F303', 'STM32F401', 'STM32F405', 'STM32F407', 'STM32F411', 'STM32F446', 'STM32G431', 'STM32G474', 'STM32H723', 'STM32H733', 'STM32L412', 'STM32L422', 'STM32L432', 'STM32L433', 'STM32L442', 'STM32L443', 'GD32VF103', 'WB32F3G71', 'WB32FQ95'
+CHIBIOS_PROCESSORS = 'cortex-m0', 'cortex-m0plus', 'cortex-m3', 'cortex-m4', 'MKL26Z64', 'MK20DX128', 'MK20DX256', 'MK64FX512', 'MK66FX1M0', 'RP2040', 'STM32F042', 'STM32F072', 'STM32F103', 'STM32F303', 'STM32F401', 'STM32F405', 'STM32F407', 'STM32F411', 'STM32F446', 'STM32G431', 'STM32G474', 'STM32H723', 'STM32H733', 'STM32L412', 'STM32L422', 'STM32L432', 'STM32L433', 'STM32L442', 'STM32L443', 'GD32VF103', 'WB32F3G71', 'WB32FQ95', 'AT32F415'
 LUFA_PROCESSORS = 'at90usb162', 'atmega16u2', 'atmega32u2', 'atmega16u4', 'atmega32u4', 'at90usb646', 'at90usb647', 'at90usb1286', 'at90usb1287', None
 VUSB_PROCESSORS = 'atmega32a', 'atmega328p', 'atmega328', 'attiny85'
 
@@ -55,6 +55,7 @@ MCU2BOOTLOADER = {
     "GD32VF103": "gd32v-dfu",
     "WB32F3G71": "wb32-dfu",
     "WB32FQ95": "wb32-dfu",
+    "AT32F415": "at32-dfu",
     "atmega16u2": "atmel-dfu",
     "atmega32u2": "atmel-dfu",
     "atmega16u4": "atmel-dfu",
@@ -93,6 +94,7 @@ BOOTLOADER_VIDS_PIDS = {
     'apm32-dfu': {("314b", "0106")},
     'gd32v-dfu': {("28e9", "0189")},
     'wb32-dfu': {("342d", "dfa0")},
+    'at32-dfu': {("2e3c", "df11")},
     'bootloadhid': {("16c0", "05df")},
     'usbasploader': {("16c0", "05dc")},
     'usbtinyisp': {("1782", "0c9f")},

lib/python/qmk/painter.py

@@ -3,6 +3,7 @@
 import datetime
 import math
 import re
+from pathlib import Path
 from string import Template
 from PIL import Image, ImageOps
 
@@ -137,10 +138,31 @@ def _render_image_metadata(metadata):
     return "\n".join(lines)
 
 
-def generate_subs(cli, out_bytes, *, font_metadata=None, image_metadata=None, command):
+def command_args_str(cli, command_name):
+    """Given a command name, introspect milc to get the arguments passed in."""
+
+    args = {}
+    max_length = 0
+    for arg_name, was_passed in cli.args_passed[command_name].items():
+        max_length = max(max_length, len(arg_name))
+
+        val = getattr(cli.args, arg_name.replace("-", "_"))
+
+        # do not leak full paths, keep just file name
+        if isinstance(val, Path):
+            val = val.name
+
+        args[arg_name] = val
+
+    return "\n".join(f"//    {arg_name.ljust(max_length)} | {val}" for arg_name, val in args.items())
+
+
+def generate_subs(cli, out_bytes, *, font_metadata=None, image_metadata=None, command_name):
     if font_metadata is not None and image_metadata is not None:
         raise ValueError("Cant generate subs for font and image at the same time")
 
+    args = command_args_str(cli, command_name)
+
     subs = {
         "year": datetime.date.today().strftime("%Y"),
         "input_file": cli.args.input.name,
@@ -148,7 +170,8 @@ def generate_subs(cli, out_bytes, *, font_metadata=None, image_metadata=None, co
         "byte_count": len(out_bytes),
         "bytes_lines": render_bytes(out_bytes),
         "format": cli.args.format,
-        "generator_command": command,
+        "generator_command": command_name.replace("_", "-"),
+        "command_args": args,
     }
 
     if font_metadata is not None:
@@ -167,7 +190,7 @@ def generate_subs(cli, out_bytes, *, font_metadata=None, image_metadata=None, co
         subs.update({
             "generated_type": "image",
             "var_prefix": "gfx",
-            "generator_command": command,
+            "generator_command": command_name,
             "metadata": _render_image_metadata(image_metadata),
         })
 
@@ -183,7 +206,8 @@ license_template = """\
 // Copyright ${year} QMK -- generated source code only, ${generated_type} retains original copyright
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-// This file was auto-generated by `${generator_command}`
+// This file was auto-generated by `${generator_command}` with arguments:
+${command_args}
 """
 
 

platforms/chibios/boards/GENERIC_AT32_F415XX/board/board.c

@@ -0,0 +1,101 @@
+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+    ChibiOS - Copyright (C) 2023..2024 HorrorTroll
+    ChibiOS - Copyright (C) 2023..2024 Zhaqian
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#include "hal.h"
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   PAL setup.
+ * @details Digital I/O ports static configuration as defined in @p board.h.
+ *          This variable is used by the HAL when initializing the PAL driver.
+ */
+#if HAL_USE_PAL || defined(__DOXYGEN__)
+const PALConfig pal_default_config =
+{
+  {VAL_GPIOAODT, VAL_GPIOACFGLR, VAL_GPIOACFGHR},
+  {VAL_GPIOBODT, VAL_GPIOBCFGLR, VAL_GPIOBCFGHR},
+#if AT32_HAS_GPIOC
+  {VAL_GPIOCODT, VAL_GPIOCCFGLR, VAL_GPIOCCFGHR},
+#endif
+  {VAL_GPIODODT, VAL_GPIODCFGLR, VAL_GPIODCFGHR},
+#if AT32_HAS_GPIOF
+  {VAL_GPIOFODT, VAL_GPIOFCFGLR, VAL_GPIOFCFGHR},
+#endif
+};
+#endif
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Early initialization code.
+ * @details System clocks are initialized before everything else.
+ */
+void __early_init(void) {
+  at32_clock_init();
+}
+
+#if HAL_USE_SDC || defined(__DOXYGEN__)
+/**
+ * @brief   SDC card detection.
+ */
+bool sdc_lld_is_card_inserted(SDCDriver *sdcp) {
+  static bool last_status = false;
+
+  if (blkIsTransferring(sdcp))
+    return last_status;
+  return last_status = (bool)palReadPad(GPIOC, GPIOC_PIN11);
+}
+
+/**
+ * @brief   SDC card write protection detection.
+ */
+bool sdc_lld_is_write_protected(SDCDriver *sdcp) {
+
+  (void)sdcp;
+  return false;
+}
+#endif /* HAL_USE_SDC */
+
+/**
+ * @brief   Board-specific initialization code.
+ * @note    You can add your board-specific code here.
+ */
+void boardInit(void) {
+  IOMUX->REMAP |= IOMUX_REMAP_SWJTAG_MUX_JTAGDIS;
+}

platforms/chibios/boards/GENERIC_AT32_F415XX/board/board.h

@@ -0,0 +1,207 @@
+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+    ChibiOS - Copyright (C) 2023..2024 HorrorTroll
+    ChibiOS - Copyright (C) 2023..2024 Zhaqian
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#ifndef _BOARD_H_
+#define _BOARD_H_
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+/*
+ * Setup for a Generic AT32F415 board.
+ */
+
+/*
+ * Board identifier.
+ */
+#define BOARD_GENERIC_AT32_F415XX
+#define BOARD_NAME                  "GENERIC AT32F415 board"
+
+/*
+ * Board oscillators-related settings.
+ */
+#if !defined(AT32_LEXTCLK)
+#define AT32_LEXTCLK                32768
+#endif
+
+#if !defined(AT32_HEXTCLK)
+#define AT32_HEXTCLK                8000000
+#endif
+
+/*
+ * MCU type, supported types are defined in ./os/hal/platforms/hal_lld.h.
+ */
+#define AT32F415KB
+
+/*
+ * IO pins assignments.
+ */
+#define GPIOA_PIN0                  0U
+#define GPIOA_PIN1                  1U
+#define GPIOA_PIN2                  2U
+#define GPIOA_PIN3                  3U
+#define GPIOA_PIN4                  4U
+#define GPIOA_PIN5                  5U
+#define GPIOA_PIN6                  6U
+#define GPIOA_PIN7                  7U
+#define GPIOA_PIN8                  8U
+#define GPIOA_PIN9                  9U
+#define GPIOA_PIN10                 10U
+#define GPIOA_PIN11                 11U
+#define GPIOA_PIN12                 12U
+#define GPIOA_SWDIO                 13U
+#define GPIOA_SWCLK                 14U
+#define GPIOA_PIN15                 15U
+
+#define GPIOB_PIN0                  0U
+#define GPIOB_PIN1                  1U
+#define GPIOB_PIN2                  2U
+#define GPIOB_PIN3                  3U
+#define GPIOB_PIN4                  4U
+#define GPIOB_PIN5                  5U
+#define GPIOB_PIN6                  6U
+#define GPIOB_PIN7                  7U
+#define GPIOB_PIN8                  8U
+#define GPIOB_PIN9                  9U
+#define GPIOB_PIN10                 10U
+#define GPIOB_PIN11                 11U
+#define GPIOB_PIN12                 12U
+#define GPIOB_PIN13                 13U
+#define GPIOB_PIN14                 14U
+#define GPIOB_PIN15                 15U
+
+#define GPIOC_PIN0                  0U
+#define GPIOC_PIN1                  1U
+#define GPIOC_PIN2                  2U
+#define GPIOC_PIN3                  3U
+#define GPIOC_PIN4                  4U
+#define GPIOC_PIN5                  5U
+#define GPIOC_PIN6                  6U
+#define GPIOC_PIN7                  7U
+#define GPIOC_PIN8                  8U
+#define GPIOC_PIN9                  9U
+#define GPIOC_PIN10                 10U
+#define GPIOC_PIN11                 11U
+#define GPIOC_PIN12                 12U
+#define GPIOC_PIN13                 13U
+#define GPIOC_PIN14                 14U
+#define GPIOC_PIN15                 15U
+
+#define GPIOD_HEXT_IN               0U
+#define GPIOD_HEXT_OUT              1U
+#define GPIOD_PIN2                  2U
+
+#define GPIOF_PIN4                  4U
+#define GPIOF_PIN5                  5U
+#define GPIOF_PIN6                  6U
+#define GPIOF_PIN7                  7U
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/*
+ * I/O ports initial setup, this configuration is established soon after reset
+ * in the initialization code.
+ *
+ * The digits have the following meaning:
+ *   0 - Analog input.
+ *   1 - Push Pull output 10MHz.
+ *   2 - Push Pull output 2MHz.
+ *   3 - Push Pull output 50MHz.
+ *   4 - Digital input.
+ *   5 - Open Drain output 10MHz.
+ *   6 - Open Drain output 2MHz.
+ *   7 - Open Drain output 50MHz.
+ *   8 - Digital input with Pull-Up or Pull-Down resistor depending on ODT.
+ *   9 - Alternate Push Pull output 10MHz.
+ *   A - Alternate Push Pull output 2MHz.
+ *   B - Alternate Push Pull output 50MHz.
+ *   C - Reserved.
+ *   D - Alternate Open Drain output 10MHz.
+ *   E - Alternate Open Drain output 2MHz.
+ *   F - Alternate Open Drain output 50MHz.
+ * Please refer to the AT32 Reference Manual for details.
+ */
+
+/*
+ * Port A setup.
+ */
+#define VAL_GPIOACFGLR          0x88888B88      /*  PA7...PA0 */
+#define VAL_GPIOACFGHR          0x888888B8      /* PA15...PA8 */
+#define VAL_GPIOAODT            0xFFFFFFFF
+
+/*
+ * Port B setup.
+ */
+#define VAL_GPIOBCFGLR          0x88888888      /*  PB7...PB0 */
+#define VAL_GPIOBCFGHR          0x88888888      /* PB15...PB8 */
+#define VAL_GPIOBODT            0xFFFFFFFF
+
+/*
+ * Port C setup.
+ */
+#define VAL_GPIOCCFGLR          0x88888888      /*  PC7...PC0 */
+#define VAL_GPIOCCFGHR          0x88888888      /* PC15...PC8 */
+#define VAL_GPIOCODT            0xFFFFFFFF
+
+/*
+ * Port D setup.
+ * Everything input with pull-up except:
+ * PD0  - Normal input              (GPIOD_HEXT_IN).
+ * PD1  - Normal input              (GPIOD_HEXT_OUT).
+ */
+#define VAL_GPIODCFGLR          0x88888844      /*  PD7...PD0 */
+#define VAL_GPIODCFGHR          0x88888888      /* PD15...PD8 */
+#define VAL_GPIODODT            0xFFFFFFFF
+
+/*
+ * Port F setup.
+ */
+#define VAL_GPIOFCFGLR          0x88888888      /*  PF7...PF0 */
+#define VAL_GPIOFCFGHR          0x88888888      /* PF15...PF8 */
+#define VAL_GPIOFODT            0xFFFFFFFF
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#if !defined(_FROM_ASM_)
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void boardInit(void);
+#ifdef __cplusplus
+}
+#endif
+#endif /* _FROM_ASM_ */
+
+#endif /* _BOARD_H_ */

platforms/chibios/boards/GENERIC_AT32_F415XX/board/board.mk

@@ -0,0 +1,9 @@
+# List of all the board related files.
+BOARDSRC = $(BOARD_PATH)/board/board.c
+
+# Required include directories
+BOARDINC = $(BOARD_PATH)/board
+
+# Shared variables
+ALLCSRC += $(BOARDSRC)
+ALLINC  += $(BOARDINC)

platforms/chibios/boards/GENERIC_AT32_F415XX/configs/config.h

@@ -0,0 +1,13 @@
+// Copyright 2023-2024 HorrorTroll <https://github.com/HorrorTroll>
+// Copyright 2023-2024 Zhaqian <https://github.com/zhaqian12>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define BOARD_OTG_VBUSIG
+
+#define USB_ENDPOINTS_ARE_REORDERABLE
+
+#ifndef EARLY_INIT_PERFORM_BOOTLOADER_JUMP
+#    define EARLY_INIT_PERFORM_BOOTLOADER_JUMP TRUE
+#endif

platforms/chibios/boards/GENERIC_AT32_F415XX/configs/mcuconf.h

@@ -0,0 +1,236 @@
+/*
+    ChibiOS - Copyright (C) 2006..2020 Giovanni Di Sirio
+    ChibiOS - Copyright (C) 2023..2024 HorrorTroll
+    ChibiOS - Copyright (C) 2023..2024 Zhaqian
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#ifndef MCUCONF_H
+#define MCUCONF_H
+
+/*
+ * AT32F415 drivers configuration.
+ * The following settings override the default settings present in
+ * the various device driver implementation headers.
+ * Note that the settings for each driver only have effect if the whole
+ * driver is enabled in halconf.h.
+ *
+ * IRQ priorities:
+ * 15...0       Lowest...Highest.
+ *
+ * DMA priorities:
+ * 0...3        Lowest...Highest.
+ */
+
+#define AT32F415_MCUCONF
+
+/*
+ * General settings.
+ */
+#define AT32_NO_INIT                        FALSE
+
+/*
+ * HAL driver system settings.
+ */
+#define AT32_HICK_ENABLED                   TRUE
+#define AT32_LICK_ENABLED                   FALSE
+#define AT32_HEXT_ENABLED                   TRUE
+#define AT32_LEXT_ENABLED                   FALSE
+#define AT32_SCLKSEL                        AT32_SCLKSEL_PLL
+#define AT32_PLLRCS                         AT32_PLLRCS_HEXT
+#define AT32_PLLHEXTDIV                     AT32_PLLHEXTDIV_DIV1
+#define AT32_PLLCFGEN                       AT32_PLLCFGEN_SOLID
+#define AT32_PLLMULT_VALUE                  18
+#define AT32_PLL_FR_VALUE                   4
+#define AT32_PLL_MS_VALUE                   1
+#define AT32_PLL_NS_VALUE                   72
+#define AT32_AHBDIV                         AT32_AHBDIV_DIV1
+#define AT32_APB1DIV                        AT32_APB1DIV_DIV2
+#define AT32_APB2DIV                        AT32_APB2DIV_DIV2
+#define AT32_ADCDIV                         AT32_ADCDIV_DIV4
+#define AT32_USB_CLOCK_REQUIRED             TRUE
+#define AT32_USBDIV                         AT32_USBDIV_DIV3
+#define AT32_CLKOUT_SEL                     AT32_CLKOUT_SEL_NOCLOCK
+#define AT32_CLKOUTDIV                      AT32_CLKOUTDIV_DIV1
+#define AT32_ERTCSEL                        AT32_ERTCSEL_HEXTDIV
+#define AT32_PVM_ENABLE                     FALSE
+#define AT32_PVMSEL                         AT32_PVMSEL_LEV1
+
+/*
+ * IRQ system settings.
+ */
+#define AT32_IRQ_EXINT0_PRIORITY            6
+#define AT32_IRQ_EXINT1_PRIORITY            6
+#define AT32_IRQ_EXINT2_PRIORITY            6
+#define AT32_IRQ_EXINT3_PRIORITY            6
+#define AT32_IRQ_EXINT4_PRIORITY            6
+#define AT32_IRQ_EXINT5_9_PRIORITY          6
+#define AT32_IRQ_EXINT10_15_PRIORITY        6
+#define AT32_IRQ_EXINT16_PRIORITY           6
+#define AT32_IRQ_EXINT17_PRIORITY           15
+#define AT32_IRQ_EXINT18_PRIORITY           6
+#define AT32_IRQ_EXINT19_PRIORITY           6
+#define AT32_IRQ_EXINT20_PRIORITY           6
+#define AT32_IRQ_EXINT21_PRIORITY           15
+#define AT32_IRQ_EXINT22_PRIORITY           15
+
+#define AT32_IRQ_TMR1_BRK_TMR9_PRIORITY     7
+#define AT32_IRQ_TMR1_OVF_TMR10_PRIORITY    7
+#define AT32_IRQ_TMR1_HALL_TMR11_PRIORITY   7
+#define AT32_IRQ_TMR1_CH_PRIORITY           7
+#define AT32_IRQ_TMR2_PRIORITY              7
+#define AT32_IRQ_TMR3_PRIORITY              7
+#define AT32_IRQ_TMR4_PRIORITY              7
+#define AT32_IRQ_TMR5_PRIORITY              7
+
+#define AT32_IRQ_USART1_PRIORITY            12
+#define AT32_IRQ_USART2_PRIORITY            12
+#define AT32_IRQ_USART3_PRIORITY            12
+#define AT32_IRQ_UART4_PRIORITY             12
+#define AT32_IRQ_UART5_PRIORITY             12
+
+/*
+ * ADC driver system settings.
+ */
+#define AT32_ADC_USE_ADC1                   FALSE
+#define AT32_ADC_ADC1_DMA_PRIORITY          2
+#define AT32_ADC_ADC1_IRQ_PRIORITY          6
+
+/*
+ * CAN driver system settings.
+ */
+#define AT32_CAN_USE_CAN1                   FALSE
+#define AT32_CAN_CAN1_IRQ_PRIORITY          11
+
+/*
+ * DMA driver system settings.
+ */
+#define AT32_DMA_USE_DMAMUX                 TRUE
+
+/*
+ * GPT driver system settings.
+ */
+#define AT32_GPT_USE_TMR1                   FALSE
+#define AT32_GPT_USE_TMR2                   FALSE
+#define AT32_GPT_USE_TMR3                   FALSE
+#define AT32_GPT_USE_TMR4                   FALSE
+#define AT32_GPT_USE_TMR5                   FALSE
+#define AT32_GPT_USE_TMR9                   FALSE
+#define AT32_GPT_USE_TMR10                  FALSE
+#define AT32_GPT_USE_TMR11                  FALSE
+
+/*
+ * I2C driver system settings.
+ */
+#define AT32_I2C_USE_I2C1                   FALSE
+#define AT32_I2C_USE_I2C2                   FALSE
+#define AT32_I2C_BUSY_TIMEOUT               50
+#define AT32_I2C_I2C1_IRQ_PRIORITY          5
+#define AT32_I2C_I2C2_IRQ_PRIORITY          5
+#define AT32_I2C_I2C1_DMA_PRIORITY          3
+#define AT32_I2C_I2C2_DMA_PRIORITY          3
+#define AT32_I2C_DMA_ERROR_HOOK(i2cp)       osalSysHalt("DMA failure")
+
+/*
+ * ICU driver system settings.
+ */
+#define AT32_ICU_USE_TMR1                   FALSE
+#define AT32_ICU_USE_TMR2                   FALSE
+#define AT32_ICU_USE_TMR3                   FALSE
+#define AT32_ICU_USE_TMR4                   FALSE
+#define AT32_ICU_USE_TMR5                   FALSE
+#define AT32_ICU_USE_TMR9                   FALSE
+#define AT32_ICU_USE_TMR10                  FALSE
+#define AT32_ICU_USE_TMR11                  FALSE
+
+/*
+ * PWM driver system settings.
+ */
+#define AT32_PWM_USE_TMR1                   FALSE
+#define AT32_PWM_USE_TMR2                   FALSE
+#define AT32_PWM_USE_TMR3                   FALSE
+#define AT32_PWM_USE_TMR4                   FALSE
+#define AT32_PWM_USE_TMR5                   FALSE
+#define AT32_PWM_USE_TMR9                   FALSE
+#define AT32_PWM_USE_TMR10                  FALSE
+#define AT32_PWM_USE_TMR11                  FALSE
+
+/*
+ * RTC driver system settings.
+ */
+#define AT32_ERTC_DIVA_VALUE                32
+#define AT32_ERTC_DIVB_VALUE                1024
+#define AT32_ERTC_CTRL_INIT                 0
+#define AT32_ERTC_TAMP_INIT                 0
+
+/*
+ * SDC driver system settings.
+ */
+#define AT32_SDC_SDIO_DMA_PRIORITY          3
+#define AT32_SDC_SDIO_IRQ_PRIORITY          9
+#define AT32_SDC_WRITE_TIMEOUT_MS           1000
+#define AT32_SDC_READ_TIMEOUT_MS            1000
+#define AT32_SDC_CLOCK_ACTIVATION_DELAY     10
+#define AT32_SDC_SDIO_UNALIGNED_SUPPORT     TRUE
+
+/*
+ * SERIAL driver system settings.
+ */
+#define AT32_SERIAL_USE_USART1              FALSE
+#define AT32_SERIAL_USE_USART2              FALSE
+#define AT32_SERIAL_USE_USART3              FALSE
+#define AT32_SERIAL_USE_UART4               FALSE
+#define AT32_SERIAL_USE_UART5               FALSE
+
+/*
+ * SPI driver system settings.
+ */
+#define AT32_SPI_USE_SPI1                   FALSE
+#define AT32_SPI_USE_SPI2                   FALSE
+#define AT32_SPI_SPI1_DMA_PRIORITY          1
+#define AT32_SPI_SPI2_DMA_PRIORITY          1
+#define AT32_SPI_SPI1_IRQ_PRIORITY          10
+#define AT32_SPI_SPI2_IRQ_PRIORITY          10
+#define AT32_SPI_DMA_ERROR_HOOK(spip)       osalSysHalt("DMA failure")
+
+/*
+ * ST driver system settings.
+ */
+#define AT32_ST_IRQ_PRIORITY                8
+#define AT32_ST_USE_TIMER                   2
+
+/*
+ * UART driver system settings.
+ */
+#define AT32_UART_USE_USART1                FALSE
+#define AT32_UART_USE_USART2                FALSE
+#define AT32_UART_USE_USART3                FALSE
+#define AT32_UART_USART1_DMA_PRIORITY       0
+#define AT32_UART_USART2_DMA_PRIORITY       0
+#define AT32_UART_USART3_DMA_PRIORITY       0
+#define AT32_UART_DMA_ERROR_HOOK(uartp)     osalSysHalt("DMA failure")
+
+/*
+ * USB driver system settings.
+ */
+#define AT32_USB_USE_OTG1                   TRUE
+#define AT32_USB_OTG1_IRQ_PRIORITY          14
+#define AT32_USB_OTG1_RX_FIFO_SIZE          512
+
+/*
+ * WDG driver system settings.
+ */
+#define AT32_WDG_USE_WDT                    FALSE
+
+#endif /* MCUCONF_H */

platforms/chibios/bootloader.mk

@@ -26,6 +26,7 @@
 #     stm32-dfu    STM32 USB DFU in ROM
 #     apm32-dfu    APM32 USB DFU in ROM
 #     wb32-dfu     WB32 USB DFU in ROM
+#     at32-dfu     AT32 USB DFU in ROM
 #     tinyuf2      TinyUF2
 #     rp2040       Raspberry Pi RP2040
 # Current options for RISC-V:
@@ -119,6 +120,14 @@ ifeq ($(strip $(BOOTLOADER)), wb32-dfu)
     OPT_DEFS += -DBOOTLOADER_WB32_DFU
     BOOTLOADER_TYPE = wb32_dfu
 endif
+ifeq ($(strip $(BOOTLOADER)), at32-dfu)
+    OPT_DEFS += -DBOOTLOADER_AT32_DFU
+    BOOTLOADER_TYPE = at32_dfu
+
+    # Options to pass to dfu-util when flashing
+    DFU_ARGS ?= -d 2E3C:DF11 -a 0 -s 0x08000000:leave
+    DFU_SUFFIX_ARGS ?= -v 2E3C -p DF11
+endif
 
 ifeq ($(strip $(BOOTLOADER_TYPE)),)
     ifneq ($(strip $(BOOTLOADER)),)

platforms/chibios/bootloaders/at32_dfu.c

@@ -0,0 +1,83 @@
+// Copyright 2021-2023 QMK
+// Copyright 2023-2024 HorrorTroll <https://github.com/HorrorTroll>
+// Copyright 2023-2024 Zhaqian <https://github.com/zhaqian12>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "bootloader.h"
+#include "util.h"
+
+#include <ch.h>
+#include <hal.h>
+#include "wait.h"
+
+#ifndef AT32_BOOTLOADER_RAM_SYMBOL
+#    define AT32_BOOTLOADER_RAM_SYMBOL __ram0_end__
+#endif
+
+extern uint32_t AT32_BOOTLOADER_RAM_SYMBOL;
+
+/* This code should be checked whether it runs correctly on platforms */
+#define SYMVAL(sym) (uint32_t)(((uint8_t *)&(sym)) - ((uint8_t *)0))
+#define BOOTLOADER_MAGIC 0xDEADBEEF
+#define MAGIC_ADDR (unsigned long *)(SYMVAL(AT32_BOOTLOADER_RAM_SYMBOL) - 4)
+
+__attribute__((weak)) void bootloader_marker_enable(void) {
+    uint32_t *marker = (uint32_t *)MAGIC_ADDR;
+    *marker          = BOOTLOADER_MAGIC; // set magic flag => reset handler will jump into boot loader
+}
+
+__attribute__((weak)) bool bootloader_marker_active(void) {
+    const uint32_t *marker = (const uint32_t *)MAGIC_ADDR;
+    return (*marker == BOOTLOADER_MAGIC) ? true : false;
+}
+
+__attribute__((weak)) void bootloader_marker_disable(void) {
+    uint32_t *marker = (uint32_t *)MAGIC_ADDR;
+    *marker          = 0;
+}
+
+__attribute__((weak)) void bootloader_jump(void) {
+    bootloader_marker_enable();
+    NVIC_SystemReset();
+}
+
+__attribute__((weak)) void mcu_reset(void) {
+    NVIC_SystemReset();
+}
+
+void enter_bootloader_mode_if_requested(void) {
+    if (bootloader_marker_active()) {
+        bootloader_marker_disable();
+
+        struct system_memory_vector_t {
+            uint32_t stack_top;
+            void (*entrypoint)(void);
+        };
+        const struct system_memory_vector_t *bootloader = (const struct system_memory_vector_t *)(AT32_BOOTLOADER_ADDRESS);
+
+        __disable_irq();
+
+#if defined(__MPU_PRESENT) && (__MPU_PRESENT == 1U)
+        ARM_MPU_Disable();
+#endif
+
+        SysTick->CTRL = 0;
+        SysTick->VAL  = 0;
+        SysTick->LOAD = 0;
+
+        // Clear interrupt enable and interrupt pending registers
+        for (int i = 0; i < ARRAY_SIZE(NVIC->ICER); i++) {
+            NVIC->ICER[i] = 0xFFFFFFFF;
+            NVIC->ICPR[i] = 0xFFFFFFFF;
+        }
+
+        __set_CONTROL(0);
+        __set_MSP(bootloader->stack_top);
+        __enable_irq();
+
+        // Jump to bootloader
+        bootloader->entrypoint();
+        while (true) {
+        }
+    }
+}

platforms/chibios/chibios_config.h

@@ -142,6 +142,19 @@
 #    endif
 #endif
 
+// AT32 compatibility
+#if defined(MCU_AT32)
+#    define CPU_CLOCK AT32_SYSCLK
+
+#    if defined(AT32F415)
+#        define USE_GPIOV1
+#        define USE_I2CV1
+#        define PAL_MODE_ALTERNATE_OPENDRAIN PAL_MODE_AT32_ALTERNATE_OPENDRAIN
+#        define PAL_MODE_ALTERNATE_PUSHPULL PAL_MODE_AT32_ALTERNATE_PUSHPULL
+#        define AUDIO_PWM_PAL_MODE PAL_MODE_ALTERNATE_PUSHPULL
+#    endif
+#endif
+
 #if defined(GD32VF103)
 /* This chip has the same API as STM32F103, but uses different names for literally the same thing.
  * As of 4.7.2021 QMK is tailored to use STM32 defines/names, for compatibility sake

platforms/chibios/drivers/analog.c

@@ -22,7 +22,7 @@
 #    error "You need to set HAL_USE_ADC to TRUE in your halconf.h to use the ADC."
 #endif
 
-#if !RP_ADC_USE_ADC1 && !STM32_ADC_USE_ADC1 && !STM32_ADC_USE_ADC2 && !STM32_ADC_USE_ADC3 && !STM32_ADC_USE_ADC4 && !WB32_ADC_USE_ADC1
+#if !RP_ADC_USE_ADC1 && !STM32_ADC_USE_ADC1 && !STM32_ADC_USE_ADC2 && !STM32_ADC_USE_ADC3 && !STM32_ADC_USE_ADC4 && !WB32_ADC_USE_ADC1 && !AT32_ADC_USE_ADC1
 #    error "You need to set one of the 'xxx_ADC_USE_ADCx' settings to TRUE in your mcuconf.h to use the ADC."
 #endif
 
@@ -45,7 +45,7 @@
 // Otherwise assume V3
 #if defined(STM32F0XX) || defined(STM32L0XX)
 #    define USE_ADCV1
-#elif defined(STM32F1XX) || defined(STM32F2XX) || defined(STM32F4XX) || defined(GD32VF103) || defined(WB32F3G71xx) || defined(WB32FQ95xx)
+#elif defined(STM32F1XX) || defined(STM32F2XX) || defined(STM32F4XX) || defined(GD32VF103) || defined(WB32F3G71xx) || defined(WB32FQ95xx) || defined(AT32F415)
 #    define USE_ADCV2
 #endif
 
@@ -82,7 +82,7 @@
 
 /* User configurable ADC options */
 #ifndef ADC_COUNT
-#    if defined(RP2040) || defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F4XX) || defined(GD32VF103) || defined(WB32F3G71xx) || defined(WB32FQ95xx)
+#    if defined(RP2040) || defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F4XX) || defined(GD32VF103) || defined(WB32F3G71xx) || defined(WB32FQ95xx) || defined(AT32F415)
 #        define ADC_COUNT 1
 #    elif defined(STM32F3XX) || defined(STM32G4XX)
 #        define ADC_COUNT 4
@@ -142,11 +142,16 @@ static ADCConversionGroup adcConversionGroup = {
     .cfgr1 = ADC_CFGR1_CONT | ADC_RESOLUTION,
     .smpr  = ADC_SAMPLING_RATE,
 #elif defined(USE_ADCV2)
-#    if !defined(STM32F1XX) && !defined(GD32VF103) && !defined(WB32F3G71xx) && !defined(WB32FQ95xx)
-    .cr2   = ADC_CR2_SWSTART, // F103 seem very unhappy with, F401 seems very unhappy without...
+#    if !defined(STM32F1XX) && !defined(GD32VF103) && !defined(WB32F3G71xx) && !defined(WB32FQ95xx) && !defined(AT32F415)
+    .cr2  = ADC_CR2_SWSTART, // F103 seem very unhappy with, F401 seems very unhappy without...
 #    endif
+#    if defined(AT32F415)
+    .spt2 = ADC_SPT2_CSPT_AN0(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN1(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN2(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN3(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN4(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN5(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN6(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN7(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN8(ADC_SAMPLING_RATE) | ADC_SPT2_CSPT_AN9(ADC_SAMPLING_RATE),
+    .spt1 = ADC_SPT1_CSPT_AN10(ADC_SAMPLING_RATE) | ADC_SPT1_CSPT_AN11(ADC_SAMPLING_RATE) | ADC_SPT1_CSPT_AN12(ADC_SAMPLING_RATE) | ADC_SPT1_CSPT_AN13(ADC_SAMPLING_RATE) | ADC_SPT1_CSPT_AN14(ADC_SAMPLING_RATE) | ADC_SPT1_CSPT_AN15(ADC_SAMPLING_RATE),
+#    else
     .smpr2 = ADC_SMPR2_SMP_AN0(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN1(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN2(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN3(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN4(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN5(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN6(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN7(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN8(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN9(ADC_SAMPLING_RATE),
     .smpr1 = ADC_SMPR1_SMP_AN10(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN11(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN12(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN13(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN14(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN15(ADC_SAMPLING_RATE),
+#    endif
 #elif defined(RP2040)
 // RP2040 does not have any extra config here
 #else
@@ -242,7 +247,7 @@ __attribute__((weak)) adc_mux pinToMux(pin_t pin) {
         case F9:  return TO_MUX( ADC_CHANNEL_IN7,  2 );
         case F10: return TO_MUX( ADC_CHANNEL_IN8,  2 );
 #    endif
-#elif defined(STM32F1XX) || defined(GD32VF103) || defined(WB32F3G71xx) || defined(WB32FQ95xx)
+#elif defined(STM32F1XX) || defined(GD32VF103) || defined(WB32F3G71xx) || defined(WB32FQ95xx) || defined(AT32F415)
         case A0:  return TO_MUX( ADC_CHANNEL_IN0,  0 );
         case A1:  return TO_MUX( ADC_CHANNEL_IN1,  0 );
         case A2:  return TO_MUX( ADC_CHANNEL_IN2,  0 );
@@ -344,7 +349,7 @@ __attribute__((weak)) adc_mux pinToMux(pin_t pin) {
 
 static inline ADCDriver* intToADCDriver(uint8_t adcInt) {
     switch (adcInt) {
-#if RP_ADC_USE_ADC1 || STM32_ADC_USE_ADC1 || WB32_ADC_USE_ADC1
+#if RP_ADC_USE_ADC1 || STM32_ADC_USE_ADC1 || WB32_ADC_USE_ADC1 || AT32_ADC_USE_ADC1
         case 0:
             return &ADCD1;
 #endif
@@ -391,7 +396,11 @@ int16_t adc_read(adc_mux mux) {
     // TODO: fix previous assumption of only 1 input...
     adcConversionGroup.chselr = 1 << mux.input; /*no macro to convert N to ADC_CHSELR_CHSEL1*/
 #elif defined(USE_ADCV2)
+#    if defined(AT32F415)
+    adcConversionGroup.osq3 = ADC_OSQ3_OSN1_N(mux.input);
+#    else
     adcConversionGroup.sqr3 = ADC_SQR3_SQ1_N(mux.input);
+#    endif
 #elif defined(RP2040)
     adcConversionGroup.channel_mask = 1 << mux.input;
 #else

platforms/chibios/drivers/serial_usart.c

@@ -9,6 +9,17 @@
 
 #if defined(SERIAL_USART_CONFIG)
 static QMKSerialConfig serial_config = SERIAL_USART_CONFIG;
+#elif defined(MCU_AT32) /* AT32 MCUs */
+static QMKSerialConfig serial_config = {
+    .speed = (SERIAL_USART_SPEED),
+    .ctrl1 = (SERIAL_USART_CTRL1),
+    .ctrl2 = (SERIAL_USART_CTRL2),
+#    if !defined(SERIAL_USART_FULL_DUPLEX)
+    .ctrl3 = ((SERIAL_USART_CTRL3) | USART_CTRL3_SLBEN) /* activate half-duplex mode */
+#    else
+    .ctrl3 = (SERIAL_USART_CTRL3)
+#    endif
+};
 #elif defined(MCU_STM32) /* STM32 MCUs */
 static QMKSerialConfig serial_config = {
 #    if HAL_USE_SERIAL
@@ -160,7 +171,7 @@ inline bool serial_transport_receive_blocking(uint8_t* destination, const size_t
  * @brief Initiate pins for USART peripheral. Half-duplex configuration.
  */
 __attribute__((weak)) void usart_init(void) {
-#    if defined(MCU_STM32) /* STM32 MCUs */
+#    if defined(MCU_STM32) || defined(MCU_AT32) /* STM32 and AT32 MCUs */
 #        if defined(USE_GPIOV1)
     palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE_OPENDRAIN);
 #        else
@@ -183,7 +194,7 @@ __attribute__((weak)) void usart_init(void) {
  * @brief Initiate pins for USART peripheral. Full-duplex configuration.
  */
 __attribute__((weak)) void usart_init(void) {
-#    if defined(MCU_STM32) /* STM32 MCUs */
+#    if defined(MCU_STM32) || defined(MCU_AT32) /* STM32 and AT32 MCUs */
 #        if defined(USE_GPIOV1)
     palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE_PUSHPULL);
     palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_INPUT);

platforms/chibios/drivers/serial_usart.h

@@ -74,40 +74,75 @@ typedef SIOConfig QMKSerialConfig;
 #    endif
 #endif
 
-#if !defined(USART_CR1_M0)
-#    define USART_CR1_M0 USART_CR1_M // some platforms (f1xx) dont have this so
-#endif
+#if defined(MCU_STM32) /* STM32 MCUs */
+#    if !defined(USART_CR1_M0)
+#        define USART_CR1_M0 USART_CR1_M // some platforms (f1xx) dont have this so
+#    endif
 
-#if !defined(SERIAL_USART_CR1)
-#    define SERIAL_USART_CR1 (USART_CR1_PCE | USART_CR1_PS | USART_CR1_M0) // parity enable, odd parity, 9 bit length
-#endif
+#    if !defined(SERIAL_USART_CR1)
+#        define SERIAL_USART_CR1 (USART_CR1_PCE | USART_CR1_PS | USART_CR1_M0) // parity enable, odd parity, 9 bit length
+#    endif
 
-#if !defined(SERIAL_USART_CR2)
-#    define SERIAL_USART_CR2 (USART_CR2_STOP_1) // 2 stop bits
-#endif
+#    if !defined(SERIAL_USART_CR2)
+#        define SERIAL_USART_CR2 (USART_CR2_STOP_1) // 2 stop bits
+#    endif
 
-#if !defined(SERIAL_USART_CR3)
-#    define SERIAL_USART_CR3 0
-#endif
+#    if !defined(SERIAL_USART_CR3)
+#        define SERIAL_USART_CR3 0
+#    endif
 
-#if defined(USART1_REMAP)
-#    define USART_REMAP                             \
-        do {                                        \
-            (AFIO->MAPR |= AFIO_MAPR_USART1_REMAP); \
-        } while (0)
-#elif defined(USART2_REMAP)
-#    define USART_REMAP                             \
-        do {                                        \
-            (AFIO->MAPR |= AFIO_MAPR_USART2_REMAP); \
-        } while (0)
-#elif defined(USART3_PARTIALREMAP)
-#    define USART_REMAP                                          \
-        do {                                                     \
-            (AFIO->MAPR |= AFIO_MAPR_USART3_REMAP_PARTIALREMAP); \
-        } while (0)
-#elif defined(USART3_FULLREMAP)
-#    define USART_REMAP                                       \
-        do {                                                  \
-            (AFIO->MAPR |= AFIO_MAPR_USART3_REMAP_FULLREMAP); \
-        } while (0)
+#    if defined(USART1_REMAP)
+#        define USART_REMAP                             \
+            do {                                        \
+                (AFIO->MAPR |= AFIO_MAPR_USART1_REMAP); \
+            } while (0)
+#    elif defined(USART2_REMAP)
+#        define USART_REMAP                             \
+            do {                                        \
+                (AFIO->MAPR |= AFIO_MAPR_USART2_REMAP); \
+            } while (0)
+#    elif defined(USART3_PARTIALREMAP)
+#        define USART_REMAP                                          \
+            do {                                                     \
+                (AFIO->MAPR |= AFIO_MAPR_USART3_REMAP_PARTIALREMAP); \
+            } while (0)
+#    elif defined(USART3_FULLREMAP)
+#        define USART_REMAP                                       \
+            do {                                                  \
+                (AFIO->MAPR |= AFIO_MAPR_USART3_REMAP_FULLREMAP); \
+            } while (0)
+#    endif
+#elif defined(MCU_AT32) /* AT32 MCUs */
+#    if !defined(USART_CTRL1_DBN0)
+#        define USART_CTRL1_DBN0 USART_CTRL1_DBN
+#    endif
+
+#    if !defined(SERIAL_USART_CTRL1)
+#        define SERIAL_USART_CTRL1 (USART_CTRL1_PEN | USART_CTRL1_PSEL | USART_CTRL1_DBN0) // parity enable, odd parity, 9 bit length
+#    endif
+
+#    if !defined(SERIAL_USART_CTRL2)
+#        define SERIAL_USART_CTRL2 (USART_CTRL2_STOPBN_1) // 2 stop bits
+#    endif
+
+#    if !defined(SERIAL_USART_CTRL3)
+#        define SERIAL_USART_CTRL3 0
+#    endif
+
+#    if defined(USART1_REMAP)
+#        define USART_REMAP                               \
+            do {                                          \
+                (IOMUX->REMAP |= IOMUX_REMAP_USART1_MUX); \
+            } while (0)
+#    elif defined(USART3_PARTIALREMAP)
+#        define USART_REMAP                                    \
+            do {                                               \
+                (IOMUX->REMAP |= IOMUX_REMAP_USART3_MUX_MUX1); \
+            } while (0)
+#    elif defined(USART3_FULLREMAP)
+#        define USART_REMAP                                    \
+            do {                                               \
+                (IOMUX->REMAP |= IOMUX_REMAP_USART3_MUX_MUX2); \
+            } while (0)
+#    endif
 #endif

platforms/chibios/drivers/spi_master.c

@@ -103,9 +103,15 @@ bool spi_start_extended(spi_start_config_t *start_config) {
         roundedDivisor <<= 1;
     }
 
+#    if defined(AT32F415)
+    if (roundedDivisor < 2 || roundedDivisor > 1024) {
+        return false;
+    }
+#    else
     if (roundedDivisor < 2 || roundedDivisor > 256) {
         return false;
     }
+#    endif
 #endif
 
 #if defined(K20x) || defined(KL2x)
@@ -240,6 +246,59 @@ bool spi_start_extended(spi_start_config_t *start_config) {
             spiConfig.SSPCR0 |= SPI_SSPCR0_SPH; // Clock phase: sample on second edge transition
             break;
     }
+#elif defined(AT32F415)
+    spiConfig.ctrl1 = 0;
+
+    if (lsbFirst) {
+        spiConfig.ctrl1 |= SPI_CTRL1_LTF;
+    }
+
+    switch (mode) {
+        case 0:
+            break;
+        case 1:
+            spiConfig.ctrl1 |= SPI_CTRL1_CLKPHA;
+            break;
+        case 2:
+            spiConfig.ctrl1 |= SPI_CTRL1_CLKPOL;
+            break;
+        case 3:
+            spiConfig.ctrl1 |= SPI_CTRL1_CLKPHA | SPI_CTRL1_CLKPOL;
+            break;
+    }
+
+    switch (roundedDivisor) {
+        case 2:
+            break;
+        case 4:
+            spiConfig.ctrl1 |= SPI_CTRL1_MDIV_0;
+            break;
+        case 8:
+            spiConfig.ctrl1 |= SPI_CTRL1_MDIV_1;
+            break;
+        case 16:
+            spiConfig.ctrl1 |= SPI_CTRL1_MDIV_1 | SPI_CTRL1_MDIV_0;
+            break;
+        case 32:
+            spiConfig.ctrl1 |= SPI_CTRL1_MDIV_2;
+            break;
+        case 64:
+            spiConfig.ctrl1 |= SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_0;
+            break;
+        case 128:
+            spiConfig.ctrl1 |= SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_1;
+            break;
+        case 256:
+            spiConfig.ctrl1 |= SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_1 | SPI_CTRL1_MDIV_0;
+            break;
+        case 512:
+            spiConfig.ctrl2 |= SPI_CTRL1_MDIV_3;
+            break;
+        case 1024:
+            spiConfig.ctrl2 |= SPI_CTRL1_MDIV_3;
+            spiConfig.ctrl1 |= SPI_CTRL1_MDIV_0;
+            break;
+    }
 #else
     spiConfig.cr1 = 0;
 

platforms/chibios/drivers/wear_leveling/wear_leveling_efl.c

@@ -33,7 +33,7 @@ static inline uint32_t detect_flash_size(void) {
 #elif defined(FLASH_SIZE)
     return FLASH_SIZE;
 #elif defined(FLASHSIZE_BASE)
-#    if defined(QMK_MCU_SERIES_STM32F0XX) || defined(QMK_MCU_SERIES_STM32F1XX) || defined(QMK_MCU_SERIES_STM32F3XX) || defined(QMK_MCU_SERIES_STM32F4XX) || defined(QMK_MCU_SERIES_STM32G4XX) || defined(QMK_MCU_SERIES_STM32L0XX) || defined(QMK_MCU_SERIES_STM32L4XX) || defined(QMK_MCU_SERIES_GD32VF103)
+#    if defined(QMK_MCU_SERIES_STM32F0XX) || defined(QMK_MCU_SERIES_STM32F1XX) || defined(QMK_MCU_SERIES_STM32F3XX) || defined(QMK_MCU_SERIES_STM32F4XX) || defined(QMK_MCU_SERIES_STM32G4XX) || defined(QMK_MCU_SERIES_STM32L0XX) || defined(QMK_MCU_SERIES_STM32L4XX) || defined(QMK_MCU_SERIES_AT32F415) || defined(QMK_MCU_SERIES_GD32VF103)
     return ((*(uint32_t *)FLASHSIZE_BASE) & 0xFFFFU) << 10U; // this register has the flash size in kB, so we convert it to bytes
 #    elif defined(QMK_MCU_SERIES_STM32L1XX)
 #        error This MCU family has an uncommon flash size register definition and has not been implemented. Perhaps try using the true EEPROM on the MCU instead?

platforms/chibios/drivers/wear_leveling/wear_leveling_efl_config.h

@@ -16,6 +16,8 @@
 #        define BACKING_STORE_WRITE_SIZE 4 // from hal_efl_lld.c
 #    elif defined(QMK_MCU_FAMILY_WB32)
 #        define BACKING_STORE_WRITE_SIZE 8 // from hal_efl_lld.c
+#    elif defined(QMK_MCU_FAMILY_AT32)
+#        define BACKING_STORE_WRITE_SIZE 2 // from hal_efl_lld.c
 #    elif defined(QMK_MCU_FAMILY_STM32)
 #        if defined(STM32_FLASH_LINE_SIZE) // from some family's stm32_registry.h file
 #            define BACKING_STORE_WRITE_SIZE (STM32_FLASH_LINE_SIZE)

platforms/chibios/drivers/ws2812_bitbang.c

@@ -11,7 +11,7 @@
 /* Adapted from https://github.com/bigjosh/SimpleNeoPixelDemo/ */
 
 #ifndef WS2812_BITBANG_NOP_FUDGE
-#    if defined(STM32F0XX) || defined(STM32F1XX) || defined(GD32VF103) || defined(STM32F3XX) || defined(STM32F4XX) || defined(STM32L0XX) || defined(WB32F3G71xx) || defined(WB32FQ95xx)
+#    if defined(STM32F0XX) || defined(STM32F1XX) || defined(GD32VF103) || defined(STM32F3XX) || defined(STM32F4XX) || defined(STM32L0XX) || defined(WB32F3G71xx) || defined(WB32FQ95xx) || defined(AT32F415)
 #        define WS2812_BITBANG_NOP_FUDGE 0.4
 #    else
 #        if defined(RP2040)

platforms/chibios/drivers/ws2812_pwm.c

@@ -40,6 +40,9 @@
 #if (STM32_DMA_SUPPORTS_DMAMUX == TRUE) && !defined(WS2812_PWM_DMAMUX_ID)
 #    error "please consult your MCU's datasheet and specify in your config.h: #define WS2812_PWM_DMAMUX_ID STM32_DMAMUX1_TIM?_UP"
 #endif
+#if (AT32_DMA_SUPPORTS_DMAMUX == TRUE) && !defined(WS2812_PWM_DMAMUX_CHANNEL) && !defined(WS2812_PWM_DMAMUX_ID)
+#    error "please consult your MCU's datasheet and specify in your config.h: #define WS2812_PWM_DMAMUX_CHANNEL 1, #define WS2812_PWM_DMAMUX_ID AT32_DMAMUX_TMR?_OVERFLOW"
+#endif
 
 /* Summarize https://www.st.com/resource/en/application_note/an4013-stm32-crossseries-timer-overview-stmicroelectronics.pdf to
  * figure out if we are using a 32bit timer. This is needed to setup the DMA controller correctly.
@@ -269,6 +272,14 @@ typedef uint32_t ws2812_buffer_t;
 #        define WS2812_PWM_DMA_PERIPHERAL_WIDTH STM32_DMA_CR_PSIZE_HWORD
 typedef uint16_t ws2812_buffer_t;
 #    endif
+#elif defined(AT32F415)
+#    define WS2812_PWM_DMA_MEMORY_WIDTH AT32_DMA_CCTRL_MWIDTH_BYTE
+#    if defined(WS2812_PWM_TIMER_32BIT)
+#        define WS2812_PWM_DMA_PERIPHERAL_WIDTH AT32_DMA_CCTRL_PWIDTH_WORD
+#    else
+#        define WS2812_PWM_DMA_PERIPHERAL_WIDTH AT32_DMA_CCTRL_PWIDTH_HWORD
+#    endif
+typedef uint8_t ws2812_buffer_t;
 #else
 #    define WS2812_PWM_DMA_MEMORY_WIDTH STM32_DMA_CR_MSIZE_BYTE
 #    if defined(WS2812_PWM_TIMER_32BIT)
@@ -309,8 +320,13 @@ void ws2812_init(void) {
                 [0 ... 3]                = {.mode = PWM_OUTPUT_DISABLED, .callback = NULL},    // Channels default to disabled
                 [WS2812_PWM_CHANNEL - 1] = {.mode = WS2812_PWM_OUTPUT_MODE, .callback = NULL}, // Turn on the channel we care about
             },
+#if defined(AT32F415)
+        .ctrl2 = 0,
+        .iden  = AT32_TMR_IDEN_OVFDEN, // DMA on update event for next period
+#else
         .cr2  = 0,
         .dier = TIM_DIER_UDE, // DMA on update event for next period
+#endif
     };
     //#pragma GCC diagnostic pop  // Restore command-line warning options
 
@@ -321,6 +337,11 @@ void ws2812_init(void) {
     dmaStreamSetSource(WS2812_PWM_DMA_STREAM, ws2812_frame_buffer);
     dmaStreamSetDestination(WS2812_PWM_DMA_STREAM, &(WS2812_PWM_DRIVER.tim->CCR[WS2812_PWM_CHANNEL - 1])); // Ziel ist der An-Zeit im Cap-Comp-Register
     dmaStreamSetMode(WS2812_PWM_DMA_STREAM, WB32_DMA_CHCFG_HWHIF(WS2812_PWM_DMA_CHANNEL) | WB32_DMA_CHCFG_DIR_M2P | WB32_DMA_CHCFG_PSIZE_WORD | WB32_DMA_CHCFG_MSIZE_WORD | WB32_DMA_CHCFG_MINC | WB32_DMA_CHCFG_CIRC | WB32_DMA_CHCFG_TCIE | WB32_DMA_CHCFG_PL(3));
+#elif defined(AT32F415)
+    dmaStreamAlloc(WS2812_PWM_DMA_STREAM - AT32_DMA_STREAM(0), 10, NULL, NULL);
+    dmaStreamSetPeripheral(WS2812_PWM_DMA_STREAM, &(WS2812_PWM_DRIVER.tmr->CDT[WS2812_PWM_CHANNEL - 1])); // Ziel ist der An-Zeit im Cap-Comp-Register
+    dmaStreamSetMemory0(WS2812_PWM_DMA_STREAM, ws2812_frame_buffer);
+    dmaStreamSetMode(WS2812_PWM_DMA_STREAM, AT32_DMA_CCTRL_DTD_M2P | WS2812_PWM_DMA_PERIPHERAL_WIDTH | WS2812_PWM_DMA_MEMORY_WIDTH | AT32_DMA_CCTRL_MINCM | AT32_DMA_CCTRL_LM | AT32_DMA_CCTRL_CHPL(3));
 #else
     dmaStreamAlloc(WS2812_PWM_DMA_STREAM - STM32_DMA_STREAM(0), 10, NULL, NULL);
     dmaStreamSetPeripheral(WS2812_PWM_DMA_STREAM, &(WS2812_PWM_DRIVER.tim->CCR[WS2812_PWM_CHANNEL - 1])); // Ziel ist der An-Zeit im Cap-Comp-Register
@@ -335,6 +356,11 @@ void ws2812_init(void) {
     dmaSetRequestSource(WS2812_PWM_DMA_STREAM, WS2812_PWM_DMAMUX_ID);
 #endif
 
+#if (AT32_DMA_SUPPORTS_DMAMUX == TRUE)
+    // If the MCU has a DMAMUX we need to assign the correct resource
+    dmaSetRequestSource(WS2812_PWM_DMA_STREAM, WS2812_PWM_DMAMUX_CHANNEL, WS2812_PWM_DMAMUX_ID);
+#endif
+
     // Start DMA
     dmaStreamEnable(WS2812_PWM_DMA_STREAM);
 

platforms/chibios/drivers/ws2812_spi.c

@@ -40,26 +40,53 @@
 
 // Define SPI config speed
 // baudrate should target 3.2MHz
+#if defined(AT32F415)
+#    if WS2812_SPI_DIVISOR == 2
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (0)
+#    elif WS2812_SPI_DIVISOR == 4
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (SPI_CTRL1_MDIV_0)
+#    elif WS2812_SPI_DIVISOR == 8
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (SPI_CTRL1_MDIV_1)
+#    elif WS2812_SPI_DIVISOR == 16 // default
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (SPI_CTRL1_MDIV_1 | SPI_CTRL1_MDIV_0)
+#    elif WS2812_SPI_DIVISOR == 32
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (SPI_CTRL1_MDIV_2)
+#    elif WS2812_SPI_DIVISOR == 64
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_0)
+#    elif WS2812_SPI_DIVISOR == 128
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_1)
+#    elif WS2812_SPI_DIVISOR == 256
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_1 | SPI_CTRL1_MDIV_0)
+#    elif WS2812_SPI_DIVISOR == 512
+#        define WS2812_SPI_DIVISOR_CTRL2_MDIV_X (SPI_CTRL1_MDIV_3)
+#    elif WS2812_SPI_DIVISOR == 1024
+#        define WS2812_SPI_DIVISOR_CTRL2_MDIV_X (SPI_CTRL1_MDIV_3)
+#        define WS2812_SPI_DIVISOR_CTRL1_MDIV_X (SPI_CTRL1_MDIV_0)
+#    else
+#        error "Configured WS2812_SPI_DIVISOR value is not supported at this time."
+#    endif
+#else
 // F072 fpclk = 48MHz
 // 48/16 = 3Mhz
-#if WS2812_SPI_DIVISOR == 2
-#    define WS2812_SPI_DIVISOR_CR1_BR_X (0)
-#elif WS2812_SPI_DIVISOR == 4
-#    define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_0)
-#elif WS2812_SPI_DIVISOR == 8
-#    define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_1)
-#elif WS2812_SPI_DIVISOR == 16 // default
-#    define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_1 | SPI_CR1_BR_0)
-#elif WS2812_SPI_DIVISOR == 32
-#    define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2)
-#elif WS2812_SPI_DIVISOR == 64
-#    define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_0)
-#elif WS2812_SPI_DIVISOR == 128
-#    define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_1)
-#elif WS2812_SPI_DIVISOR == 256
-#    define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0)
-#else
-#    error "Configured WS2812_SPI_DIVISOR value is not supported at this time."
+#    if WS2812_SPI_DIVISOR == 2
+#        define WS2812_SPI_DIVISOR_CR1_BR_X (0)
+#    elif WS2812_SPI_DIVISOR == 4
+#        define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_0)
+#    elif WS2812_SPI_DIVISOR == 8
+#        define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_1)
+#    elif WS2812_SPI_DIVISOR == 16 // default
+#        define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_1 | SPI_CR1_BR_0)
+#    elif WS2812_SPI_DIVISOR == 32
+#        define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2)
+#    elif WS2812_SPI_DIVISOR == 64
+#        define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_0)
+#    elif WS2812_SPI_DIVISOR == 128
+#        define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_1)
+#    elif WS2812_SPI_DIVISOR == 256
+#        define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0)
+#    else
+#        error "Configured WS2812_SPI_DIVISOR value is not supported at this time."
+#    endif
 #endif
 
 // Use SPI circular buffer
@@ -176,8 +203,16 @@ void ws2812_init(void) {
         NULL, // error_cb
         PAL_PORT(WS2812_DI_PIN),
         PAL_PAD(WS2812_DI_PIN),
+#    if defined(AT32F415)
+        WS2812_SPI_DIVISOR_CTRL1_MDIV_X,
+#        if (WS2812_SPI_DIVISOR == 512 || WS2812_SPI_DIVISOR == 1024)
+        WS2812_SPI_DIVISOR_CTRL2_MDIV_X,
+#        endif
+        0
+#    else
         WS2812_SPI_DIVISOR_CR1_BR_X,
         0
+#    endif
 #endif
     };
 

platforms/chibios/flash.mk

@@ -113,6 +113,8 @@ else ifeq ($(strip $(MCU_FAMILY)),STM32)
 	$(UNSYNC_OUTPUT_CMD) && $(call EXEC_DFU_UTIL)
 else ifeq ($(strip $(MCU_FAMILY)),WB32)
 	$(UNSYNC_OUTPUT_CMD) && $(call EXEC_WB32_DFU_UPDATER)
+else ifeq ($(strip $(MCU_FAMILY)),AT32)
+	$(UNSYNC_OUTPUT_CMD) && $(call EXEC_DFU_UTIL)
 else ifeq ($(strip $(MCU_FAMILY)),GD32V)
 	$(UNSYNC_OUTPUT_CMD) && $(call EXEC_DFU_UTIL)
 else

platforms/chibios/mcu_selection.mk

@@ -809,6 +809,40 @@ ifneq ($(findstring WB32FQ95, $(MCU)),)
   WB32_BOOTLOADER_ADDRESS ?= 0x1FFFE000
 endif
 
+ifneq ($(findstring AT32F415, $(MCU)),)
+  # Cortex version
+  MCU = cortex-m4
+
+  # ARM version, CORTEX-M0/M1 are 6, CORTEX-M3/M4/M7 are 7
+  ARMV = 7
+
+  ## chip/board settings
+  # - the next two should match the directories in
+  #   <chibios[-contrib]>/os/hal/ports/$(MCU_PORT_NAME)/$(MCU_SERIES)
+  #   OR
+  #   <chibios[-contrib]>/os/hal/ports/$(MCU_FAMILY)/$(MCU_SERIES)
+  MCU_FAMILY = AT32
+  MCU_SERIES = AT32F415
+
+  # Linker script to use
+  # - it should exist either in <chibios>/os/common/startup/ARMCMx/compilers/GCC/ld/
+  #   or <keyboard_dir>/ld/
+  MCU_LDSCRIPT ?= AT32F415xB
+
+  # Startup code to use
+  #  - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
+  MCU_STARTUP ?= at32f415
+
+  # Board: it should exist either in <chibios>/os/hal/boards/,
+  # <keyboard_dir>/boards/, or drivers/boards/
+  BOARD ?= GENERIC_AT32_F415XX
+
+  USE_FPU ?= no
+
+  # Bootloader address for AT32 DFU
+  AT32_BOOTLOADER_ADDRESS ?= 0x1FFFAC00
+endif
+
 ifneq ($(findstring GD32VF103, $(MCU)),)
   # RISC-V
   MCU = risc-v

platforms/chibios/platform.mk

@@ -155,6 +155,10 @@ ifdef WB32_BOOTLOADER_ADDRESS
     OPT_DEFS += -DWB32_BOOTLOADER_ADDRESS=$(WB32_BOOTLOADER_ADDRESS)
 endif
 
+ifdef AT32_BOOTLOADER_ADDRESS
+    OPT_DEFS += -DAT32_BOOTLOADER_ADDRESS=$(AT32_BOOTLOADER_ADDRESS)
+endif
+
 # Work out if we need to set up the include for the bootloader definitions
 ifneq ("$(wildcard $(KEYBOARD_PATH_5)/bootloader_defs.h)","")
     OPT_DEFS += -include $(KEYBOARD_PATH_5)/bootloader_defs.h

quantum/keyboard.c

@@ -140,6 +140,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef OS_DETECTION_ENABLE
 #    include "os_detection.h"
 #endif
+#if defined(LAYER_LOCK_ENABLE) && LAYER_LOCK_IDLE_TIMEOUT > 0
+#    include "layer_lock.h"
+#endif // LAYER_LOCK_ENABLE
 
 static uint32_t last_input_modification_time = 0;
 uint32_t        last_input_activity_time(void) {
@@ -655,6 +658,10 @@ void quantum_task(void) {
 #ifdef SECURE_ENABLE
     secure_task();
 #endif
+
+#if defined(LAYER_LOCK_ENABLE) && LAYER_LOCK_IDLE_TIMEOUT > 0
+    layer_lock_task();
+#endif
 }
 
 /** \brief Main task that is repeatedly called as fast as possible. */

quantum/keycodes.h

@@ -759,6 +759,7 @@ enum qk_keycode_defines {
     QK_TRI_LAYER_UPPER = 0x7C78,
     QK_REPEAT_KEY = 0x7C79,
     QK_ALT_REPEAT_KEY = 0x7C7A,
+    QK_LAYER_LOCK = 0x7C7B,
     QK_KB_0 = 0x7E00,
     QK_KB_1 = 0x7E01,
     QK_KB_2 = 0x7E02,
@@ -1445,6 +1446,7 @@ enum qk_keycode_defines {
     TL_UPPR    = QK_TRI_LAYER_UPPER,
     QK_REP     = QK_REPEAT_KEY,
     QK_AREP    = QK_ALT_REPEAT_KEY,
+    QK_LLCK    = QK_LAYER_LOCK,
 };
 
 // Range Helpers
@@ -1501,7 +1503,7 @@ enum qk_keycode_defines {
 #define IS_UNDERGLOW_KEYCODE(code) ((code) >= QK_UNDERGLOW_TOGGLE && (code) <= QK_UNDERGLOW_SPEED_DOWN)
 #define IS_RGB_KEYCODE(code) ((code) >= RGB_MODE_PLAIN && (code) <= RGB_MODE_TWINKLE)
 #define IS_RGB_MATRIX_KEYCODE(code) ((code) >= QK_RGB_MATRIX_ON && (code) <= QK_RGB_MATRIX_SPEED_DOWN)
-#define IS_QUANTUM_KEYCODE(code) ((code) >= QK_BOOTLOADER && (code) <= QK_ALT_REPEAT_KEY)
+#define IS_QUANTUM_KEYCODE(code) ((code) >= QK_BOOTLOADER && (code) <= QK_LAYER_LOCK)
 #define IS_KB_KEYCODE(code) ((code) >= QK_KB_0 && (code) <= QK_KB_31)
 #define IS_USER_KEYCODE(code) ((code) >= QK_USER_0 && (code) <= QK_USER_31)
 
@@ -1527,6 +1529,6 @@ enum qk_keycode_defines {
 #define UNDERGLOW_KEYCODE_RANGE             QK_UNDERGLOW_TOGGLE ... QK_UNDERGLOW_SPEED_DOWN
 #define RGB_KEYCODE_RANGE                   RGB_MODE_PLAIN ... RGB_MODE_TWINKLE
 #define RGB_MATRIX_KEYCODE_RANGE            QK_RGB_MATRIX_ON ... QK_RGB_MATRIX_SPEED_DOWN
-#define QUANTUM_KEYCODE_RANGE               QK_BOOTLOADER ... QK_ALT_REPEAT_KEY
+#define QUANTUM_KEYCODE_RANGE               QK_BOOTLOADER ... QK_LAYER_LOCK
 #define KB_KEYCODE_RANGE                    QK_KB_0 ... QK_KB_31
 #define USER_KEYCODE_RANGE                  QK_USER_0 ... QK_USER_31

quantum/layer_lock.c

@@ -0,0 +1,81 @@
+// Copyright 2022-2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "layer_lock.h"
+#include "quantum_keycodes.h"
+
+#ifndef NO_ACTION_LAYER
+// The current lock state. The kth bit is on if layer k is locked.
+layer_state_t locked_layers = 0;
+
+// Layer Lock timer to disable layer lock after X seconds inactivity
+#    if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
+uint32_t layer_lock_timer = 0;
+
+void layer_lock_task(void) {
+    if (locked_layers && timer_elapsed32(layer_lock_timer) > LAYER_LOCK_IDLE_TIMEOUT) {
+        layer_lock_all_off();
+        layer_lock_timer = timer_read32();
+    }
+}
+#    endif // LAYER_LOCK_IDLE_TIMEOUT > 0
+
+bool is_layer_locked(uint8_t layer) {
+    return locked_layers & ((layer_state_t)1 << layer);
+}
+
+void layer_lock_invert(uint8_t layer) {
+    const layer_state_t mask = (layer_state_t)1 << layer;
+    if ((locked_layers & mask) == 0) { // Layer is being locked.
+#    ifndef NO_ACTION_ONESHOT
+        if (layer == get_oneshot_layer()) {
+            reset_oneshot_layer(); // Reset so that OSL doesn't turn layer off.
+        }
+#    endif // NO_ACTION_ONESHOT
+        layer_on(layer);
+#    if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
+        layer_lock_timer = timer_read32();
+#    endif   // LAYER_LOCK_IDLE_TIMEOUT > 0
+    } else { // Layer is being unlocked.
+        layer_off(layer);
+    }
+    layer_lock_set_kb(locked_layers ^= mask);
+}
+
+// Implement layer_lock_on/off by deferring to layer_lock_invert.
+void layer_lock_on(uint8_t layer) {
+    if (!is_layer_locked(layer)) {
+        layer_lock_invert(layer);
+    }
+}
+
+void layer_lock_off(uint8_t layer) {
+    if (is_layer_locked(layer)) {
+        layer_lock_invert(layer);
+    }
+}
+
+void layer_lock_all_off(void) {
+    layer_and(~locked_layers);
+    locked_layers = 0;
+    layer_lock_set_kb(locked_layers);
+}
+
+__attribute__((weak)) bool layer_lock_set_kb(layer_state_t locked_layers) {
+    return layer_lock_set_user(locked_layers);
+}
+__attribute__((weak)) bool layer_lock_set_user(layer_state_t locked_layers) {
+    return true;
+}
+#endif // NO_ACTION_LAYER

quantum/layer_lock.h

@@ -0,0 +1,135 @@
+// Copyright 2022-2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @file layer_lock.h
+ * @brief Layer Lock, a key to stay in the current layer.
+ *
+ * Overview
+ * --------
+ *
+ * Layers are often accessed by holding a button, e.g. with a momentary layer
+ * switch `MO(layer)` or layer tap `LT(layer, key)` key. But you may sometimes
+ * want to "lock" or "toggle" the layer so that it stays on without having to
+ * hold down a button. One way to do that is with a tap-toggle `TT` layer key,
+ * but here is an alternative.
+ *
+ * This library implements a "Layer Lock key". When tapped, it "locks" the
+ * highest layer to stay active, assuming the layer was activated by one of the
+ * following keys:
+ *
+ *  * `MO(layer)` momentary layer switch
+ *  * `LT(layer, key)` layer tap
+ *  * `OSL(layer)` one-shot layer
+ *  * `TT(layer)` layer tap toggle
+ *  * `LM(layer, mod)` layer-mod key (the layer is locked, but not the mods)
+ *
+ * Tapping the Layer Lock key again unlocks and turns off the layer.
+ *
+ * @note When a layer is "locked", other layer keys such as `TO(layer)` or
+ * manually calling `layer_off(layer)` will override and unlock the layer.
+ *
+ * Configuration
+ * -------------
+ *
+ * Optionally, a timeout may be defined so that Layer Lock disables
+ * automatically if not keys are pressed for `LAYER_LOCK_IDLE_TIMEOUT`
+ * milliseconds. Define `LAYER_LOCK_IDLE_TIMEOUT` in your config.h, for instance
+ *
+ *     #define LAYER_LOCK_IDLE_TIMEOUT 60000  // Turn off after 60 seconds.
+ *
+ * and call `layer_lock_task()` from your `matrix_scan_user()` in keymap.c:
+ *
+ *     void matrix_scan_user(void) {
+ *       layer_lock_task();
+ *       // Other tasks...
+ *     }
+ *
+ * For full documentation, see
+ * <https://getreuer.info/posts/keyboards/layer-lock>
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "action_layer.h"
+#include "action_util.h"
+
+/**
+ * Handler function for Layer Lock.
+ *
+ * In your keymap, define a custom keycode to use for Layer Lock. Then handle
+ * Layer Lock from your `process_record_user` function by calling
+ * `process_layer_lock`, passing your custom keycode for the `lock_keycode` arg:
+ *
+ *     #include "features/layer_lock.h"
+ *
+ *     bool process_record_user(uint16_t keycode, keyrecord_t* record) {
+ *       if (!process_layer_lock(keycode, record, LLOCK)) { return false; }
+ *       // Your macros ...
+ *
+ *       return true;
+ *     }
+ */
+
+#ifndef NO_ACTION_LAYER
+/** Returns true if `layer` is currently locked. */
+bool is_layer_locked(uint8_t layer);
+
+/** Locks and turns on `layer`. */
+void layer_lock_on(uint8_t layer);
+
+/** Unlocks and turns off `layer`. */
+void layer_lock_off(uint8_t layer);
+
+/** Unlocks and turns off all locked layers. */
+void layer_lock_all_off(void);
+
+/** Toggles whether `layer` is locked. */
+void layer_lock_invert(uint8_t layer);
+
+/**
+ * Optional callback that gets called when a layer is locked or unlocked.
+ *
+ * This is useful to represent the current lock state, e.g. by setting an LED or
+ * playing a sound. In your keymap, define
+ *
+ *     void layer_lock_set_user(layer_state_t locked_layers) {
+ *       // Do something like `set_led(is_layer_locked(NAV));`
+ *     }
+ *
+ * @param locked_layers Bitfield in which the kth bit represents whether the
+ *                      kth layer is on.
+ */
+bool layer_lock_set_kb(layer_state_t locked_layers);
+bool layer_lock_set_user(layer_state_t locked_layers);
+
+void layer_lock_task(void);
+#else  // NO_ACTION_LAYER
+static inline bool is_layer_locked(uint8_t layer) {
+    return false;
+}
+static inline void layer_lock_on(uint8_t layer) {}
+static inline void layer_lock_off(uint8_t layer) {}
+static inline void layer_lock_all_off(void) {}
+static inline void layer_lock_invert(uint8_t layer) {}
+static inline bool layer_lock_set_kb(layer_state_t locked_layers) {
+    return true;
+}
+static inline bool layer_lock_set_user(layer_state_t locked_layers) {
+    return true;
+}
+static inline void layer_lock_task(void) {}
+#endif // NO_ACTION_LAYER

quantum/process_keycode/process_layer_lock.c

@@ -0,0 +1,95 @@
+// Copyright 2022-2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @file layer_lock.c
+ * @brief Layer Lock implementation
+ *
+ * For full documentation, see
+ * <https://getreuer.info/posts/keyboards/layer-lock>
+ */
+
+#include "layer_lock.h"
+#include "process_layer_lock.h"
+#include "quantum_keycodes.h"
+#include "action_util.h"
+
+// The current lock state. The kth bit is on if layer k is locked.
+extern layer_state_t locked_layers;
+#if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
+extern uint32_t layer_lock_timer;
+#endif
+
+// Handles an event on an `MO` or `TT` layer switch key.
+static bool handle_mo_or_tt(uint8_t layer, keyrecord_t* record) {
+    if (is_layer_locked(layer)) {
+        if (record->event.pressed) { // On press, unlock the layer.
+            layer_lock_invert(layer);
+        }
+        return false; // Skip default handling.
+    }
+    return true;
+}
+
+bool process_layer_lock(uint16_t keycode, keyrecord_t* record) {
+#ifndef NO_ACTION_LAYER
+#    if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
+    layer_lock_timer = timer_read32();
+#    endif // LAYER_LOCK_IDLE_TIMEOUT > 0
+
+    // The intention is that locked layers remain on. If something outside of
+    // this feature turned any locked layers off, unlock them.
+    if ((locked_layers & ~layer_state) != 0) {
+        layer_lock_set_kb(locked_layers &= layer_state);
+    }
+
+    if (keycode == QK_LAYER_LOCK) {
+        if (record->event.pressed) { // The layer lock key was pressed.
+            layer_lock_invert(get_highest_layer(layer_state));
+        }
+        return false;
+    }
+
+    switch (keycode) {
+        case QK_MOMENTARY ... QK_MOMENTARY_MAX: // `MO(layer)` keys.
+            return handle_mo_or_tt(QK_MOMENTARY_GET_LAYER(keycode), record);
+
+        case QK_LAYER_TAP_TOGGLE ... QK_LAYER_TAP_TOGGLE_MAX: // `TT(layer)`.
+            return handle_mo_or_tt(QK_LAYER_TAP_TOGGLE_GET_LAYER(keycode), record);
+
+        case QK_LAYER_MOD ... QK_LAYER_MOD_MAX: { // `LM(layer, mod)`.
+            uint8_t layer = QK_LAYER_MOD_GET_LAYER(keycode);
+            if (is_layer_locked(layer)) {
+                if (record->event.pressed) { // On press, unlock the layer.
+                    layer_lock_invert(layer);
+                } else { // On release, clear the mods.
+                    clear_mods();
+                    send_keyboard_report();
+                }
+                return false; // Skip default handling.
+            }
+        } break;
+
+#    ifndef NO_ACTION_TAPPING
+        case QK_LAYER_TAP ... QK_LAYER_TAP_MAX: // `LT(layer, key)` keys.
+            if (record->tap.count == 0 && !record->event.pressed && is_layer_locked(QK_LAYER_TAP_GET_LAYER(keycode))) {
+                // Release event on a held layer-tap key where the layer is locked.
+                return false; // Skip default handling so that layer stays on.
+            }
+            break;
+#    endif // NO_ACTION_TAPPING
+    }
+#endif // NO_ACTION_LAYER
+    return true;
+}

quantum/process_keycode/process_layer_lock.h

@@ -0,0 +1,69 @@
+// Copyright 2022-2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @file layer_lock.h
+ * @brief Layer Lock, a key to stay in the current layer.
+ *
+ * Overview
+ * --------
+ *
+ * Layers are often accessed by holding a button, e.g. with a momentary layer
+ * switch `MO(layer)` or layer tap `LT(layer, key)` key. But you may sometimes
+ * want to "lock" or "toggle" the layer so that it stays on without having to
+ * hold down a button. One way to do that is with a tap-toggle `TT` layer key,
+ * but here is an alternative.
+ *
+ * This library implements a "Layer Lock key". When tapped, it "locks" the
+ * highest layer to stay active, assuming the layer was activated by one of the
+ * following keys:
+ *
+ *  * `MO(layer)` momentary layer switch
+ *  * `LT(layer, key)` layer tap
+ *  * `OSL(layer)` one-shot layer
+ *  * `TT(layer)` layer tap toggle
+ *  * `LM(layer, mod)` layer-mod key (the layer is locked, but not the mods)
+ *
+ * Tapping the Layer Lock key again unlocks and turns off the layer.
+ *
+ * @note When a layer is "locked", other layer keys such as `TO(layer)` or
+ * manually calling `layer_off(layer)` will override and unlock the layer.
+ *
+ * Configuration
+ * -------------
+ *
+ * Optionally, a timeout may be defined so that Layer Lock disables
+ * automatically if not keys are pressed for `LAYER_LOCK_IDLE_TIMEOUT`
+ * milliseconds. Define `LAYER_LOCK_IDLE_TIMEOUT` in your config.h, for instance
+ *
+ *     #define LAYER_LOCK_IDLE_TIMEOUT 60000  // Turn off after 60 seconds.
+ *
+ * and call `layer_lock_task()` from your `matrix_scan_user()` in keymap.c:
+ *
+ *     void matrix_scan_user(void) {
+ *       layer_lock_task();
+ *       // Other tasks...
+ *     }
+ *
+ * For full documentation, see
+ * <https://getreuer.info/posts/keyboards/layer-lock>
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "action.h"
+
+bool process_layer_lock(uint16_t keycode, keyrecord_t* record);

quantum/quantum.c

@@ -76,6 +76,10 @@
 #    include "process_unicode_common.h"
 #endif
 
+#ifdef LAYER_LOCK_ENABLE
+#    include "process_layer_lock.h"
+#endif // LAYER_LOCK_ENABLE
+
 #ifdef AUDIO_ENABLE
 #    ifndef GOODBYE_SONG
 #        define GOODBYE_SONG SONG(GOODBYE_SOUND)
@@ -400,6 +404,9 @@ bool process_record_quantum(keyrecord_t *record) {
 #ifdef TRI_LAYER_ENABLE
             process_tri_layer(keycode, record) &&
 #endif
+#ifdef LAYER_LOCK_ENABLE
+            process_layer_lock(keycode, record) &&
+#endif
 #ifdef BLUETOOTH_ENABLE
             process_connection(keycode, record) &&
 #endif

quantum/quantum.h

@@ -240,6 +240,10 @@ extern layer_state_t layer_state;
 #    include "os_detection.h"
 #endif
 
+#ifdef LAYER_LOCK_ENABLE
+#    include "layer_lock.h"
+#endif // LAYER_LOCK_ENABLE
+
 void set_single_default_layer(uint8_t default_layer);
 void set_single_persistent_default_layer(uint8_t default_layer);
 

tests/layer_lock/config.h

@@ -0,0 +1,8 @@
+// Copyright 2021 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "test_common.h"
+
+#define LAYER_LOCK_IDLE_TIMEOUT 1000

tests/layer_lock/test.mk

@@ -0,0 +1,8 @@
+# Copyright 2021 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# --------------------------------------------------------------------------------
+# Keep this file, even if it is empty, as a marker that this folder contains tests
+# --------------------------------------------------------------------------------
+
+LAYER_LOCK_ENABLE = yes

tests/layer_lock/test_layer_lock.cpp

@@ -0,0 +1,284 @@
+// Copyright 2021 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "keycodes.h"
+#include "test_common.hpp"
+
+using testing::_;
+
+class LayerLock : public TestFixture {};
+
+TEST_F(LayerLock, LayerLockState) {
+    TestDriver driver;
+    KeymapKey  key_a = KeymapKey(0, 0, 0, KC_A);
+    KeymapKey  key_b = KeymapKey(1, 0, 0, KC_B);
+    KeymapKey  key_c = KeymapKey(2, 0, 0, KC_C);
+    KeymapKey  key_d = KeymapKey(3, 0, 0, KC_C);
+
+    set_keymap({key_a, key_b, key_c, key_d});
+
+    EXPECT_FALSE(is_layer_locked(1));
+    EXPECT_FALSE(is_layer_locked(2));
+    EXPECT_FALSE(is_layer_locked(3));
+
+    layer_lock_invert(1); // Layer 1: unlocked -> locked
+    layer_lock_on(2);     // Layer 2: unlocked -> locked
+    layer_lock_off(3);    // Layer 3: stays unlocked
+
+    // Layers 1 and 2 are now on.
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(layer_state_is(2));
+    // Layers 1 and 2 are now locked.
+    EXPECT_TRUE(is_layer_locked(1));
+    EXPECT_TRUE(is_layer_locked(2));
+    EXPECT_FALSE(is_layer_locked(3));
+
+    layer_lock_invert(1); // Layer 1: locked -> unlocked
+    layer_lock_on(2);     // Layer 2: stays locked
+    layer_lock_on(3);     // Layer 3: unlocked -> locked
+
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_TRUE(layer_state_is(2));
+    EXPECT_TRUE(layer_state_is(3));
+    EXPECT_FALSE(is_layer_locked(1));
+    EXPECT_TRUE(is_layer_locked(2));
+    EXPECT_TRUE(is_layer_locked(3));
+
+    layer_lock_invert(1); // Layer 1: unlocked -> locked
+    layer_lock_off(2);    // Layer 2: locked -> unlocked
+
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_FALSE(layer_state_is(2));
+    EXPECT_TRUE(layer_state_is(3));
+    EXPECT_TRUE(is_layer_locked(1));
+    EXPECT_FALSE(is_layer_locked(2));
+    EXPECT_TRUE(is_layer_locked(3));
+
+    layer_lock_all_off(); // Layers 1 and 3: locked -> unlocked
+
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_FALSE(layer_state_is(2));
+    EXPECT_FALSE(layer_state_is(3));
+    EXPECT_FALSE(is_layer_locked(1));
+    EXPECT_FALSE(is_layer_locked(2));
+    EXPECT_FALSE(is_layer_locked(3));
+}
+
+TEST_F(LayerLock, LayerLockMomentaryTest) {
+    TestDriver driver;
+    KeymapKey  key_layer = KeymapKey(0, 0, 0, MO(1));
+    KeymapKey  key_a     = KeymapKey(0, 1, 0, KC_A);
+    KeymapKey  key_trns  = KeymapKey(1, 0, 0, KC_TRNS);
+    KeymapKey  key_ll    = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
+
+    set_keymap({key_layer, key_a, key_trns, key_ll});
+
+    EXPECT_NO_REPORT(driver);
+    key_layer.press();
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_FALSE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    tap_key(key_ll);
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    key_layer.release();
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    // Pressing Layer Lock again unlocks the lock.
+    EXPECT_NO_REPORT(driver);
+    key_ll.press();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_FALSE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+}
+
+TEST_F(LayerLock, LayerLockLayerTapTest) {
+    TestDriver driver;
+    KeymapKey  key_layer = KeymapKey(0, 0, 0, LT(1, KC_B));
+    KeymapKey  key_a     = KeymapKey(0, 1, 0, KC_A);
+    KeymapKey  key_trns  = KeymapKey(1, 0, 0, KC_TRNS);
+    KeymapKey  key_ll    = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
+
+    set_keymap({key_layer, key_a, key_trns, key_ll});
+
+    EXPECT_NO_REPORT(driver);
+    key_layer.press();
+    idle_for(TAPPING_TERM);
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    tap_key(key_ll);
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    // Pressing Layer Lock again unlocks the lock.
+    EXPECT_NO_REPORT(driver);
+    key_ll.press();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_FALSE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+}
+
+TEST_F(LayerLock, LayerLockOneshotTapTest) {
+    TestDriver driver;
+    KeymapKey  key_layer = KeymapKey(0, 0, 0, OSL(1));
+    KeymapKey  key_a     = KeymapKey(0, 1, 0, KC_A);
+    KeymapKey  key_trns  = KeymapKey(1, 0, 0, KC_TRNS);
+    KeymapKey  key_ll    = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
+
+    set_keymap({key_layer, key_a, key_trns, key_ll});
+
+    EXPECT_NO_REPORT(driver);
+    tap_key(key_layer);
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    tap_key(key_ll);
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    // Pressing Layer Lock again unlocks the lock.
+    EXPECT_NO_REPORT(driver);
+    key_ll.press();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_FALSE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+}
+
+TEST_F(LayerLock, LayerLockOneshotHoldTest) {
+    TestDriver driver;
+    KeymapKey  key_layer = KeymapKey(0, 0, 0, OSL(1));
+    KeymapKey  key_a     = KeymapKey(0, 1, 0, KC_A);
+    KeymapKey  key_trns  = KeymapKey(1, 0, 0, KC_TRNS);
+    KeymapKey  key_ll    = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
+
+    set_keymap({key_layer, key_a, key_trns, key_ll});
+
+    EXPECT_NO_REPORT(driver);
+    key_layer.press();
+    idle_for(TAPPING_TERM);
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    tap_key(key_ll);
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    key_layer.release();
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    // Pressing Layer Lock again unlocks the lock.
+    EXPECT_NO_REPORT(driver);
+    key_ll.press();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_FALSE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+}
+
+TEST_F(LayerLock, LayerLockTimeoutTest) {
+    TestDriver driver;
+    KeymapKey  key_layer = KeymapKey(0, 0, 0, MO(1));
+    KeymapKey  key_a     = KeymapKey(0, 1, 0, KC_A);
+    KeymapKey  key_trns  = KeymapKey(1, 0, 0, KC_TRNS);
+    KeymapKey  key_ll    = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
+
+    set_keymap({key_layer, key_a, key_trns, key_ll});
+
+    EXPECT_NO_REPORT(driver);
+    key_layer.press();
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    tap_key(key_ll);
+    EXPECT_TRUE(layer_state_is(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    key_layer.release();
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    idle_for(LAYER_LOCK_IDLE_TIMEOUT);
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_FALSE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+}
+
+TEST_F(LayerLock, ToKeyOverridesLayerLock) {
+    TestDriver driver;
+    KeymapKey  key_layer = KeymapKey(0, 0, 0, MO(1));
+    KeymapKey  key_to0   = KeymapKey(1, 0, 0, TO(0));
+    KeymapKey  key_ll    = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
+
+    set_keymap({key_layer, key_to0, key_ll});
+
+    EXPECT_NO_REPORT(driver);
+    layer_lock_on(1);
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_NO_REPORT(driver);
+    tap_key(key_to0); // TO(0) overrides Layer Lock and unlocks layer 1.
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_FALSE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+}
+
+TEST_F(LayerLock, LayerClearOverridesLayerLock) {
+    TestDriver driver;
+    KeymapKey  key_layer = KeymapKey(0, 0, 0, MO(1));
+    KeymapKey  key_a     = KeymapKey(0, 1, 0, KC_A);
+    KeymapKey  key_ll    = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
+
+    set_keymap({key_layer, key_a, key_ll});
+
+    EXPECT_NO_REPORT(driver);
+    layer_lock_on(1);
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(1));
+    EXPECT_TRUE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+
+    EXPECT_REPORT(driver, (KC_A));
+    layer_clear(); // layer_clear() overrides Layer Lock and unlocks layer 1.
+    key_a.press();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(1));
+    EXPECT_FALSE(is_layer_locked(1));
+    VERIFY_AND_CLEAR(driver);
+}

tests/test_common/keycode_table.cpp

@@ -699,6 +699,7 @@ std::map<uint16_t, std::string> KEYCODE_ID_TABLE = {
     {QK_TRI_LAYER_UPPER, "QK_TRI_LAYER_UPPER"},
     {QK_REPEAT_KEY, "QK_REPEAT_KEY"},
     {QK_ALT_REPEAT_KEY, "QK_ALT_REPEAT_KEY"},
+    {QK_LAYER_LOCK, "QK_LAYER_LOCK"},
     {QK_KB_0, "QK_KB_0"},
     {QK_KB_1, "QK_KB_1"},
     {QK_KB_2, "QK_KB_2"},