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Joystick: add support for 8-way hat switch (#24515)
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Ryan
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@ -1,6 +1,6 @@
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# Joystick {#joystick}
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This feature provides game controller input as a joystick device supporting up to 6 axes and 32 buttons. Axes can be read either from an [ADC-capable input pin](../drivers/adc), or can be virtual, so that its value is provided by your code.
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This feature provides game controller input as a joystick device supporting up to 6 axes, 32 buttons and a hat switch. Axes can be read either from an [ADC-capable input pin](../drivers/adc), or can be virtual, so that its value is provided by your code.
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An analog device such as a [potentiometer](https://en.wikipedia.org/wiki/Potentiometer) found on an analog joystick's axes is based on a voltage divider, where adjusting the movable wiper controls the output voltage which can then be read by the microcontroller's ADC.
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@ -37,6 +37,42 @@ By default, two axes and eight buttons are defined, with a reported resolution o
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You must define at least one button or axis. Also note that the maximum ADC resolution of the supported AVR MCUs is 10-bit, and 12-bit for most STM32 MCUs.
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:::
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### Hat Switch {#hat-switch}
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To enable the 8-way hat switch, add the following to your `config.h`:
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```c
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#define JOYSTICK_HAS_HAT
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````
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The position can be set by calling `joystick_set_hat(value)`. The range of values moves clockwise from the top (ie. north), with the default "center" position represented by a value of `-1`:
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```
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0
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7 N 1
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NW .--'--. NE
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/ \
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6 W | -1 | E 2
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\ /
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SW '--.--' SE
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5 S 3
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4
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```
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Alternatively you can use these predefined names:
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|Define |Value|Angle|
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|------------------------|-----|-----|
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|`JOYSTICK_HAT_CENTER` |`-1` | |
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|`JOYSTICK_HAT_NORTH` |`0` |0° |
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|`JOYSTICK_HAT_NORTHEAST`|`1` |45° |
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|`JOYSTICK_HAT_EAST` |`2` |90° |
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|`JOYSTICK_HAT_SOUTHEAST`|`3` |135° |
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|`JOYSTICK_HAT_SOUTH` |`4` |180° |
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|`JOYSTICK_HAT_SOUTHWEST`|`5` |225° |
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|`JOYSTICK_HAT_WEST` |`6` |270° |
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|`JOYSTICK_HAT_NORTHWEST`|`7` |315° |
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### Axes {#axes}
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When defining axes for your joystick, you must provide a definition array typically in your `keymap.c`.
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@ -149,6 +185,8 @@ Contains the state of the joystick.
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A bit-packed array containing the joystick button states. The size is calculated as `(JOYSTICK_BUTTON_COUNT - 1) / 8 + 1`.
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- `int16_t axes[]`
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An array of analog values for each defined axis.
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- `int8_t hat`
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The hat switch position.
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- `bool dirty`
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Whether the current state needs to be sent to the host.
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@ -222,3 +260,14 @@ Set the value of the given axis.
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The axis to set the value of.
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- `int16_t value`
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The value to set.
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---
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### `void joystick_set_hat(int8_t value)` {#api-joystick-set-hat}
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Set the position of the hat switch.
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#### Arguments {#api-joystick-set-hat-arguments}
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- `int8_t value`
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The hat switch position to set.
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@ -29,6 +29,9 @@ joystick_t joystick_state = {
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0
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#endif
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},
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#ifdef JOYSTICK_HAS_HAT
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.hat = -1,
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#endif
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.dirty = false,
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};
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@ -145,6 +148,13 @@ void joystick_set_axis(uint8_t axis, int16_t value) {
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}
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}
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#ifdef JOYSTICK_HAS_HAT
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void joystick_set_hat(int8_t value) {
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joystick_state.hat = value;
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joystick_state.dirty = true;
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}
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#endif
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void joystick_init(void) {
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joystick_init_axes();
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}
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@ -52,6 +52,16 @@
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#define JOYSTICK_MAX_VALUE ((1L << (JOYSTICK_AXIS_RESOLUTION - 1)) - 1)
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#define JOYSTICK_HAT_CENTER -1
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#define JOYSTICK_HAT_NORTH 0
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#define JOYSTICK_HAT_NORTHEAST 1
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#define JOYSTICK_HAT_EAST 2
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#define JOYSTICK_HAT_SOUTHEAST 3
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#define JOYSTICK_HAT_SOUTH 4
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#define JOYSTICK_HAT_SOUTHWEST 5
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#define JOYSTICK_HAT_WEST 6
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#define JOYSTICK_HAT_NORTHWEST 7
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// configure on input_pin of the joystick_axes array entry to NO_PIN
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// to prevent it from being read from the ADC. This allows outputting forged axis value.
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#define JOYSTICK_AXIS_VIRTUAL \
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@ -73,6 +83,9 @@ extern joystick_config_t joystick_axes[JOYSTICK_AXIS_COUNT];
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typedef struct {
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uint8_t buttons[(JOYSTICK_BUTTON_COUNT - 1) / 8 + 1];
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int16_t axes[JOYSTICK_AXIS_COUNT];
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#ifdef JOYSTICK_HAS_HAT
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int8_t hat;
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#endif
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bool dirty;
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} joystick_t;
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@ -129,4 +142,11 @@ void joystick_read_axes(void);
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*/
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void joystick_set_axis(uint8_t axis, int16_t value);
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/**
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* \brief Set the position of the hat switch.
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*
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* \param value The hat switch position to set.
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*/
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void joystick_set_hat(int8_t value);
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/** \} */
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@ -193,6 +193,10 @@ void host_joystick_send(joystick_t *joystick) {
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},
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# endif
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# ifdef JOYSTICK_HAS_HAT
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.hat = joystick->hat,
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# endif
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# if JOYSTICK_BUTTON_COUNT > 0
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.buttons =
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{
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@ -246,6 +246,11 @@ typedef struct {
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joystick_axis_t axes[JOYSTICK_AXIS_COUNT];
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#endif
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#ifdef JOYSTICK_HAS_HAT
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int8_t hat : 4;
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uint8_t reserved : 4;
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#endif
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#if JOYSTICK_BUTTON_COUNT > 0
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uint8_t buttons[(JOYSTICK_BUTTON_COUNT - 1) / 8 + 1];
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#endif
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@ -247,6 +247,23 @@ const USB_Descriptor_HIDReport_Datatype_t PROGMEM SharedReport[] = {
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HID_RI_INPUT(8, HID_IOF_DATA | HID_IOF_VARIABLE | HID_IOF_ABSOLUTE),
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# endif
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# ifdef JOYSTICK_HAS_HAT
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// Hat Switch (4 bits)
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HID_RI_USAGE(8, 0x39), // Hat Switch
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HID_RI_LOGICAL_MINIMUM(8, 0x00),
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HID_RI_LOGICAL_MAXIMUM(8, 0x07),
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HID_RI_PHYSICAL_MINIMUM(8, 0),
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HID_RI_PHYSICAL_MAXIMUM(16, 315),
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HID_RI_UNIT(8, 0x14), // Degree, English Rotation
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HID_RI_REPORT_COUNT(8, 1),
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HID_RI_REPORT_SIZE(8, 4),
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HID_RI_INPUT(8, HID_IOF_DATA | HID_IOF_VARIABLE | HID_IOF_ABSOLUTE | HID_IOF_NULLSTATE),
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// Padding (4 bits)
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HID_RI_REPORT_COUNT(8, 0x04),
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HID_RI_REPORT_SIZE(8, 0x01),
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HID_RI_INPUT(8, HID_IOF_CONSTANT),
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# endif
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# if JOYSTICK_BUTTON_COUNT > 0
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HID_RI_USAGE_PAGE(8, 0x09), // Button
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HID_RI_USAGE_MINIMUM(8, 0x01),
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@ -621,6 +621,23 @@ const PROGMEM uchar shared_hid_report[] = {
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0x81, 0x02, // Input (Data, Variable, Absolute)
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# endif
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# ifdef JOYSTICK_HAS_HAT
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// Hat Switch (4 bits)
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0x09, 0x39, // Usage (Hat Switch)
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0x15, 0x00, // Logical Minimum (0)
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0x25, 0x07, // Logical Maximum (7)
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0x35, 0x00, // Physical Minimum (0)
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0x46, 0x3B, 0x01, // Physical Maximum (315)
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0x65, 0x14, // Unit (Degree, English Rotation)
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0x95, 0x01, // Report Count (1)
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0x75, 0x04, // Report Size (4)
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0x81, 0x42, // Input (Data, Variable, Absolute, Null State)
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// Padding (4 bits)
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0x95, 0x04, // Report Count (4)
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0x75, 0x01, // Report Size (1)
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0x81, 0x01, // Input (Constant)
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# endif
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# if JOYSTICK_BUTTON_COUNT > 0
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0x05, 0x09, // Usage Page (Button)
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0x19, 0x01, // Usage Minimum (Button 1)
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