qmk_firmware/docs/feature_rgb_matrix.md

RGB Matrix Lighting

There is basic support for addressable RGB matrix lighting with the I2C IS31FL3731 RGB controller. To enable it, add this to your rules.mk:

RGB_MATRIX_ENABLE = yes

Configure the hardware via your config.h:

// This is a 7-bit address, that gets left-shifted and bit 0
// set to 0 for write, 1 for read (as per I2C protocol)
// The address will vary depending on your wiring:
// 0b1110100 AD <-> GND
// 0b1110111 AD <-> VCC
// 0b1110101 AD <-> SCL
// 0b1110110 AD <-> SDA
#define DRIVER_ADDR_1 0b1110100
#define DRIVER_ADDR_2 0b1110110

#define DRIVER_COUNT 2
#define DRIVER_1_LED_TOTAL 25
#define DRIVER_2_LED_TOTAL 24
#define DRIVER_LED_TOTAL DRIVER_1_LED_TOTAL + DRIVER_2_LED_TOTAL

Currently only 2 drivers are supported, but it would be trivial to support all 4 combinations.

Define these arrays listing all the LEDs in your <keyboard>.c:

const is31_led g_is31_leds[DRIVER_LED_TOTAL] = {
/* Refer to IS31 manual for these locations
 *   driver
 *   |  R location
 *   |  |      G location
 *   |  |      |      B location
 *   |  |      |      | */
    {0, C1_3,  C2_3,  C3_3},
    ....
}

Where Cx_y is the location of the LED in the matrix defined by the datasheet. The driver is the index of the driver you defined in your config.h (0 or 1 right now).

const rgb_led g_rgb_leds[DRIVER_LED_TOTAL] = {
/* {row | col << 4}
 *    |           {x=0..224, y=0..64}
 *    |              |               modifier
 *    |              |                 | */
    {{0|(0<<4)},   {20.36*0, 21.33*0}, 1},
    {{0|(1<<4)},   {20.36*1, 21.33*0}, 1},
    ....
}

The format for the matrix position used in this array is {row | (col << 4)}. The x is between (inclusive) 0-224, and y is between (inclusive) 0-64. The easiest way to calculate these positions is:

x = 224 / ( NUMBER_OF_ROWS - 1 ) * ROW_POSITION
y = 64 / (NUMBER_OF_COLS - 1 ) * COL_POSITION

Where all variables are decimels/floats.

modifier is a boolean, whether or not a certain key is considered a modifier (used in some effects).

Keycodes

All RGB keycodes are currently shared with the RGBLIGHT system:

* `RGB_TOG` - toggle
* `RGB_MOD` - cycle through modes
* `RGB_HUI` - increase hue
* `RGB_HUD` - decrease hue
* `RGB_SAI` - increase saturation
* `RGB_SAD` - decrease saturation
* `RGB_VAI` - increase value
* `RGB_VAD` - decrease value


* `RGB_MODE_*` keycodes will generally work, but are not currently mapped to the correct effects for the RGB Matrix system

RGB Matrix Effects

These are the effects that are currently available:

enum rgb_matrix_effects {
	RGB_MATRIX_SOLID_COLOR = 1,
    RGB_MATRIX_SOLID_REACTIVE,
    RGB_MATRIX_ALPHAS_MODS,
    RGB_MATRIX_DUAL_BEACON,
    RGB_MATRIX_GRADIENT_UP_DOWN,
    RGB_MATRIX_RAINDROPS,
    RGB_MATRIX_CYCLE_ALL,
    RGB_MATRIX_CYCLE_LEFT_RIGHT,
    RGB_MATRIX_CYCLE_UP_DOWN,
    RGB_MATRIX_RAINBOW_BEACON,
    RGB_MATRIX_RAINBOW_PINWHEELS,
    RGB_MATRIX_RAINBOW_MOVING_CHEVRON,
    RGB_MATRIX_JELLYBEAN_RAINDROPS,
#ifdef RGB_MATRIX_KEYPRESSES
    RGB_MATRIX_SPLASH,
    RGB_MATRIX_MULTISPLASH,
    RGB_MATRIX_SOLID_SPLASH,
    RGB_MATRIX_SOLID_MULTISPLASH,
#endif
    RGB_MATRIX_EFFECT_MAX
};

Custom layer effects

Custom layer effects can be done by defining this in your <keyboard>.c:

void rgb_matrix_indicators_kb(void) {
	// rgb_matrix_set_color(index, red, green, blue);
}

A similar function works in the keymap as rgb_matrix_indicators_user.

Additional config.h Options

#define RGB_MATRIX_KEYPRESSES // reacts to keypresses (will slow down matrix scan by a lot)
#define RGB_MATRIX_KEYRELEASES // reacts to keyreleases (not recommened)
#define RGB_DISABLE_AFTER_TIMEOUT 0 // number of ticks to wait until disabling effects
#define RGB_DISABLE_WHEN_USB_SUSPENDED false // turn off effects when suspended
#define RGB_MATRIX_SKIP_FRAMES 1 // number of frames to skip when displaying animations (0 is full effect)

EEPROM storage

The EEPROM for it is currently shared with the RGBLIGHT system (it's generally assumed only one RGB would be used at a time), but could be configured to use its own 32bit address with:

#define EECONFIG_RGB_MATRIX (uint32_t *)16

Where 16 is an unused index from eeconfig.h.

Suspended state

To use the suspend feature, add this to your <keyboard>.c:

void suspend_power_down_kb(void)
{
    rgb_matrix_set_suspend_state(true);
}

void suspend_wakeup_init_kb(void)
{
    rgb_matrix_set_suspend_state(false);
}