qmk_firmware/reference_info_json.md

info.json

The information contained in info.json is combined with the config.h and rules.mk files, dynamically generating the necessary configuration for your keyboard at compile time. It is also used by the QMK API, and contains the information QMK Configurator needs to display a representation of your keyboard. Its key/value pairs are ruled by the data/schemas/keyboard.jsonschema file. To learn more about the why and how of the schema file see the Data Driven Configuration page.

You can create info.json files at every level under qmk_firmware/keyboards/<name>. These files are combined, with more specific files overriding keys in less specific files. This means you do not need to duplicate your metadata information. For example, qmk_firmware/keyboards/clueboard/info.json specifies manufacturer and maintainer, while qmk_firmware/keyboards/clueboard/66/info.json specifies more specific information about Clueboard 66%.

info.json Format

The info.json file is a JSON formatted dictionary. The first six keys noted here must be defined in info.json, or your keyboard will not be accepted into the QMK repository.

• keyboard_name
  • A free-form text string describing the keyboard.
  • Example: Clueboard 66%
• manufacturer
  • A free-form text string describing the keyboard's manufacturer.
  • Example: Clueboard
• url
  • A URL to the keyboard's product page, QMK.fm/keyboards page, or other page describing information about the keyboard.
  • Example: https://clueboard.co
• maintainer
  • GitHub username of the maintainer, or qmk for community maintained boards.
  • Example: skullydazed
• usb
  • Configure USB VID, PID, and device version. See the USB section for more detail.
• debounce
  • The amount of time in milliseconds to wait for debounce to happen.
  • Default: 5
• diode_direction
  • The direction diodes face. See DIRECT_PINS in the hardware configuration for more details.
• layout_aliases
  • A dictionary containing layout aliases. The key is the alias and the value is a layout in layouts it maps to.
• layouts
  • Physical Layout representations. See the Layout Format section for more detail.
• matrix_pins
  • Configure the pins corresponding to columns and rows, or direct pins. See the Matrix Pins section for more detail.
• rgblight
  • Configure the RGB Lighting feature. See the RGB Lighting section for more detail.

?> For all the available keys and their allowed values refer back to the data/schemas/keyboard.jsonschema file.

Layout Format

Within our info.json file the layouts portion of the dictionary contains several nested dictionaries. The outer layer consists of QMK layout macros, for example LAYOUT_ansi or LAYOUT_iso.

• layout
  • A list of Key Dictionaries describing the physical layout. See the next section for more details.

Key Dictionary Format

Each Key Dictionary in a layout describes the physical properties of a key. If you are familiar with the Raw Data for https://keyboard-layout-editor.com you will find many of the concepts the same. We re-use the same key names and layout choices wherever possible, but unlike keyboard-layout-editor each key is stateless, inheriting no properties from the keys that came before it.

All key positions and rotations are specified in relation to the top-left corner of the keyboard, and the top-left corner of each key.

• x
  • Required. The absolute position of the key in the horizontal axis, in Key Units.
• y
  • Required. The absolute position of the key in the vertical axis, in Key Units.
• w
  • The width of the key, in Key Units.
  • Default: 1
• h
  • The height of the key, in Key Units.
  • Default: 1
• label
  • What to name this position in the matrix. This should usually correspond to the keycode for the first layer of the default keymap.
• matrix
  • A two item list describing the row and column location for this key.
  • Example: [0, 4]

Matrix Pins

Currently QMK supports connecting switches either directly to GPIO pins or via a switch matrix. At this time you can not combine these, they are mutually exclusive.

Switch Matrix

Most keyboards use a switch matrix to connect keyswitches to the MCU. You can define your pin columns and rows to configure your switch matrix. When defining switch matrices you should also define your diode_direction.

Example:

{
    "diode_direction": "COL2ROW",
    "matrix_pins": {
        "cols": ["F4", "E6", "B1", "D2"],
        "rows": ["B0", "D3", "D5", "D4", "D6"]
    }
}

Direct Pins

Direct pins are when you connect one side of the switch to GND and the other side to a GPIO pin on your MCU. No diode is required, but there is a 1:1 mapping between switches and pins.

When specifying direct pins you need to arrange them in nested arrays. The outer array consists of rows, while the inner array uses text strings to identify the pins used in each row. You can use null to indicate an empty spot in the matrix.

Notice that when using direct pins, diode_direction is left undefined.

Example:

{
    "matrix_pins": {
        "direct": [
            ["A10", "A9"],
            ["A0", "B8"],
            [null, "B11"],
            ["B9", "A8"],
            ["A7", "B1"],
            [null, "B2"]
        ]
    }
}

Additional Options

• input_pressed_state
  • This configures state of the GPIO pins when the key is pressed - 1 for high, 0 for low
  • Default: 0

Example:

    "matrix_pins": {
        "input_pressed_state": 1,
},

Non-RGB LED Lighting

This section controls basic 2-pin LEDs, which typically pass through keyswitches and are soldered into the PCB, or are placed in PCB sockets.

Backlight

Enable by setting

    "features": {
        "backlight": true
    }

• breathing
  • Enable backlight breathing, if supported
• breathing_period
  • The length of one backlight “breath” in seconds
• levels
  • The number of brightness levels (maximum 31, excluding off)
• max_brightness
  • The maximum duty cycle of the backlight LED(s) (0-255)
• pin
  • The pin that controls the backlight LED(s)
• pins
  • Array of pins that controls the backlight LED(s) (See Multiple Backlight Pins)
• on_state
  • The state of the indicator pins when the LED is "on" - 1 for high, 0 for low
  • Default: 1

Example:

{
    "backlight": {
        "breathing": true,
        "breathing_period": 5,
        "levels": 15,
        "pin": "B7"
    }
}

LED Indicators

Used for indicating Num Lock, Caps Lock, and Scroll Lock. May be soldered in-switch or in a dedicated area.

• num_lock
  • The pin that controls the Num Lock LED
• caps_lock
  • The pin that controls the Caps Lock LED
• scroll_lock
  • The pin that controls the Scroll Lock LED
• compose
  • The pin that controls the Compose LED
• kana
  • The pin that controls the Kana LED
• on_state
  • The state of the indicator pins when the LED is "on" - 1 for high, 0 for low
  • Default: 1

Example:

{
    "indicators": {
        "num_lock": "B6",
        "caps_lock": "D2",
        "scroll_lock": "A3"
    }
}

RGB Lighting

This section controls the legacy WS2812 support in QMK. This should not be confused with the RGB Matrix feature, which can be used to control both WS2812 and ISSI RGB LEDs.

The following items can be set. Not every value is required.

• led_count
  • The number of LEDs in your strip
• pin
  • The GPIO pin that your LED strip is connected to
• animations
  • A dictionary that lists enabled and disabled animations. See RGB Light Animations below.
• sleep
  • Set to true to enable lighting during host sleep
• split
  • Set to true to enable synchronization functionality between split halves
• split_count
  • For split keyboards, the number of LEDs on each side
  • Example [ 10 , 10 ]
• max_brightness
  • What the maximum brightness (value) level is (0-255)
• hue_steps
  • How many steps of adjustment to have for hue
• saturation_steps
  • How many steps of adjustment to have for saturation
• brightness_steps
  • How many steps of adjustment to have for brightness (value)

Example:

{
    "rgblight": {
        "led_count": 4,
        "pin": "F6",
        "hue_steps": 10,
        "saturation_steps": 17,
        "brightness_steps": 17,
        "animations": {
            "knight": true,
            "rainbow_swirl": true
        }
    }
}

RGBLight Animations

The following animations can be enabled:

Key	Description
alternating	Enable alternating animation mode.
breathing	Enable breathing animation mode.
christmas	Enable christmas animation mode.
knight	Enable knight animation mode.
rainbow_mood	Enable rainbow mood animation mode.
rainbow_swirl	Enable rainbow swirl animation mode.
rgb_test	Enable RGB test animation mode.
snake	Enable snake animation mode.
static_gradient	Enable static gradient mode.
twinkle	Enable twinkle animation mode.

USB

Every USB keyboard needs to have its USB parameters defined. At a minimum you need to set the Vendor ID, Product ID, and device version.

Example:

{
    "usb": {
        "vid": "0xC1ED",
        "pid": "0x23B0",
        "device_version": "1.0.0"
    }
}

The device version is a BCD (binary coded decimal) value, in the format MMmr, so the below value would look like 0x0100 in the generated code. This also means the maximum valid values for each part are 99.9.9, despite it being a hexadecimal value under the hood.

Encoders

This section controls the basic rotary encoder support.

Enable by setting

    "features": {
        "encoder": true
    }

The following items can be set. Not every value is required.

• pin_a
  • Required. A pad definition
• pin_b
  • Required. B pad definition
• resolution
  • How many pulses the encoder registers between each detent

Examples:

{
    "encoder": {
        "rotary": [
            { "pin_a": "B5", "pin_b": "A2" }
        ]
    }
}

{
    "encoder": {
        "rotary": [
            { "pin_a": "B5", "pin_b": "A2", "resolution": 4 }
            { "pin_a": "B6", "pin_b": "A3", "resolution": 2 }
        ]
    }
}

Secure

The following options can be configured:

Key	Description
unlock_sequence	Timeout for the user to perform the configured unlock sequence - 0 to disable
unlock_timeout	Timeout while unlocked before returning to locked - 0 to disable
idle_timeout	Array of matrix locations describing a sequential sequence of keypresses

Example:

{
    "secure": {
        "unlock_sequence": [ [0,0], [0,1] ],
        "unlock_timeout": 5000,
        "idle_timeout": 60000
    }
}

Bootmagic

This section configures Bootmagic Lite support.

The following options can be configured:

Key	Description
matrix	A two item list describing the row and column location for the trigger key.

Example:

{
    "bootmagic": {
        "enabled": true,
        "matrix": [0, 0]
    },
}