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LED Matrix Lighting :id=led-matrix-lighting

This feature allows you to use LED matrices driven by external drivers. It hooks into the backlight system so you can use the same keycodes as backlighting to control it.

If you want to use RGB LED's you should use the RGB Matrix Subsystem instead.

Driver configuration :id=driver-configuration

IS31FL3731 :id=is31fl3731

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

LED_MATRIX_ENABLE = yes
LED_MATRIX_DRIVER = is31fl3731

You can use between 1 and 4 IS31FL3731 IC's. Do not specify LED_DRIVER_ADDR_<N> defines for IC's that are not present on your keyboard. You can define the following items in config.h:

Variable Description Default
IS31FL3731_I2C_TIMEOUT (Optional) How long to wait for i2c messages, in milliseconds 100
IS31FL3731_I2C_PERSISTENCE (Optional) Retry failed messages this many times 0
LED_MATRIX_LED_COUNT (Required) How many LED lights are present across all drivers
IS31FL3731_I2C_ADDRESS_1 (Required) Address for the first LED driver
IS31FL3731_I2C_ADDRESS_2 (Optional) Address for the second LED driver
IS31FL3731_I2C_ADDRESS_3 (Optional) Address for the third LED driver
IS31FL3731_I2C_ADDRESS_4 (Optional) Address for the fourth LED driver

Here is an example using 2 drivers.

// 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:
// 00 AD <-> GND
// 01 AD <-> SCL
// 10 AD <-> SDA
// 11 AD <-> VCC
// ADDR represents A1:A0 of the 7-bit address.
// The result is: 0b11101(ADDR)
#define IS31FL3731_I2C_ADDRESS_1 IS31FL3731_I2C_ADDRESS_GND
#define IS31FL3731_I2C_ADDRESS_2 IS31FL3731_I2C_ADDRESS_SDA

#define LED_DRIVER_1_LED_TOTAL 25
#define LED_DRIVER_2_LED_TOTAL 24
#define LED_MATRIX_LED_COUNT (LED_DRIVER_1_LED_TOTAL + LED_DRIVER_2_LED_TOTAL)

!> Note the parentheses, this is so when LED_MATRIX_LED_COUNT is used in code and expanded, the values are added together before any additional math is applied to them. As an example, rand() % (LED_DRIVER_1_LED_TOTAL + LED_DRIVER_2_LED_TOTAL) will give very different results than rand() % LED_DRIVER_1_LED_TOTAL + LED_DRIVER_2_LED_TOTAL.

For split keyboards using LED_MATRIX_SPLIT with an LED driver, you can either have the same driver address or different driver addresses. If using different addresses, use IS31FL3731_I2C_ADDRESS_1 for one and IS31FL3731_I2C_ADDRESS_2 for the other one. Then, in g_is31fl3731_leds, fill out the correct driver index (0 or 1). If using one address, use IS31FL3731_I2C_ADDRESS_1 for both, and use index 0 for g_is31fl3731_leds.

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

const is31fl3731_led_t PROGMEM g_is31fl3731_leds[LED_MATRIX_LED_COUNT] = {
/* Refer to IS31 manual for these locations
 *    driver
 *    |  LED address
 *    |  | */
    { 0, C1_1  },
    { 0, C1_15 },
    // ...
}

Where Cx_y is the location of the LED in the matrix defined by the datasheet and the header file drivers/led/issi/is31fl3731-simple.h. The driver is the index of the driver you defined in your config.h (0, 1, 2, or 3 ).

IS31FLCOMMON :id=is31flcommon

There is basic support for addressable LED matrix lighting with a selection of I2C ISSI Lumissil LED controllers through a shared common driver. To enable it, add this to your rules.mk:

LED_MATRIX_ENABLE = yes
LED_MATRIX_DRIVER = <driver name>

Where <driver name> is the applicable LED driver chip as below

Driver Name Data Sheet Capability
IS31FL3742A datasheet 180 LED, 30x6 Matrix
IS31FL3743A datasheet 198 LED, 18x11 Matrix
IS31FL3745 datasheet 144 LED, 18x8 Matrix
IS31FL3746A datasheet 72 LED, 18x4 Matrix

You can use between 1 and 4 IC's. Do not specify DRIVER_ADDR_<N> define for IC's if not present on your keyboard. The DRIVER_ADDR_1 default assumes that all Address pins on the controller have been connected to GND. Drivers that have SYNC functionality have the default settings to disable if 1 driver. If more than 1 drivers then DRIVER_ADDR_1 will be set to Master and the remaiing ones set to Slave.

Configure the hardware via your config.h:

Variable Description Default
ISSI_TIMEOUT (Optional) How long to wait for i2c messages, in milliseconds 100
ISSI_PERSISTENCE (Optional) Retry failed messages this many times 0
LED_MATRIX_LED_COUNT (Required) How many LED lights are present across all drivers
DRIVER_ADDR_1 (Optional) Address for the first LED driver
DRIVER_ADDR_<N> (Required) Address for the additional LED drivers
ISSI_SSR_<N> (Optional) Configuration for the Spread Spectrum Register
ISSI_CONFIGURATION (Optional) Configuration for the Configuration Register
ISSI_GLOBALCURRENT (Optional) Configuration for the Global Current Register 0xFF
ISSI_PULLDOWNUP (Optional) Configuration for the Pull Up & Pull Down Register
ISSI_TEMP (Optional) Configuration for the Tempature Register
ISSI_PWM_ENABLE (Optional) Configuration for the PWM Enable Register
ISSI_PWM_SET (Optional) Configuration for the PWM Setting Register
ISSI_SCAL_LED (Optional) Configuration for the LEDs Scaling Registers 0xFF
ISSI_MANUAL_SCALING (Optional) If you wish to configure the Scaling Registers manually

Defaults

Variable IS31FL3742A IS31FL3743A IS31FL3745 IS31FL3746
DRIVER_ADDR_1 0b0110000 0b0100000 0b0100000 0b1100000
ISSI_SSR_1 0x00 0x00 / 0x60 0x00 / 0xC0 0x00
ISSI_SSR_<2-4> 0x00 0x40 0x80 0x00
ISSI_CONFIGURATION 0x31 0x01 0x31 0x01
ISSI_PULLDOWNUP 0x55 0x33 0x33 0x33
ISSI_TEMP N/A 0x00 0x00 0x00
ISSI_PWM_ENABLE N/A N/A N/A 0x00
ISSI_PWM_SET 0x00 N/A N/A 0x00

Here is an example using 2 drivers.

#define DRIVER_ADDR_2 0b0100001

#define DRIVER_1_LED_TOTAL 66
#define DRIVER_2_LED_TOTAL 42
#define LED_MATRIX_LED_COUNT (DRIVER_1_LED_TOTAL + DRIVER_2_LED_TOTAL)

!> Note the parentheses, this is so when LED_MATRIX_LED_COUNT is used in code and expanded, the values are added together before any additional math is applied to them. As an example, rand() % (DRIVER_1_LED_TOTAL + DRIVER_2_LED_TOTAL) will give very different results than rand() % DRIVER_1_LED_TOTAL + DRIVER_2_LED_TOTAL.

Currently only 4 drivers are supported, but it would be trivial to support for more. Note that using a combination of different drivers is not supported. All drivers must be of the same model.

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

const is31_led PROGMEM g_is31_leds[LED_MATRIX_LED_COUNT] = {
/* Refer to IS31 manual for these locations
 *    driver
 *    |  LED address
 *    |  | */
    { 0, CS1_SW1 },
    { 0, CS2_SW1 },
    // ...
}

Where CSx_SWx 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, 1, 2, or 3 for now).

ISSI_MANUAL_SCALING is used to override the Scaling for individual LED's. By default they will be set as per ISSI_SCAL_LED. In config.h set how many LED's you want to manually set scaling for. Eg #define ISSI_MANUAL_SCALING 3

Then Define the array listing all the LEDs you want to override in your <keyboard>.c:

const is31_led PROGMEM g_is31_scaling[ISSI_MANUAL_SCALING] = {
/*   LED Index
 *   |  Scaling
 *   |  | */
    {5, 120},
    {9, 120},
    ....
}

Where LED Index is the position of the LED in the g_is31_leds array. The scaling value between 0 and 255 to be written to the Scaling Register.

Common Configuration :id=common-configuration

From this point forward the configuration is the same for all the drivers. The led_config_t struct provides a key electrical matrix to led index lookup table, what the physical position of each LED is on the board, and what type of key or usage the LED if the LED represents. Here is a brief example:

led_config_t g_led_config = { {
  // Key Matrix to LED Index
  {   5, NO_LED, NO_LED,   0 },
  { NO_LED, NO_LED, NO_LED, NO_LED },
  {   4, NO_LED, NO_LED,   1 },
  {   3, NO_LED, NO_LED,   2 }
}, {
  // LED Index to Physical Position
  { 188,  16 }, { 187,  48 }, { 149,  64 }, { 112,  64 }, {  37,  48 }, {  38,  16 }
}, {
  // LED Index to Flag
  1, 4, 4, 4, 4, 1
} };

The first part, // Key Matrix to LED Index, tells the system what key this LED represents by using the key's electrical matrix row & col. The second part, // LED Index to Physical Position represents the LED's physical { x, y } position on the keyboard. The default expected range of values for { x, y } is the inclusive range { 0..224, 0..64 }. This default expected range is due to effects that calculate the center of the keyboard for their animations. The easiest way to calculate these positions is imagine your keyboard is a grid, and the top left of the keyboard represents { x, y } coordinate { 0, 0 } and the bottom right of your keyboard represents { 224, 64 }. Using this as a basis, you can use the following formula to calculate the physical position:

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

Where NUMBER_OF_COLS, NUMBER_OF_ROWS, COL_POSITION, & ROW_POSITION are all based on the physical layout of your keyboard, not the electrical layout.

As mentioned earlier, the center of the keyboard by default is expected to be { 112, 32 }, but this can be changed if you want to more accurately calculate the LED's physical { x, y } positions. Keyboard designers can implement #define LED_MATRIX_CENTER { 112, 32 } in their config.h file with the new center point of the keyboard, or where they want it to be allowing more possibilities for the { x, y } values. Do note that the maximum value for x or y is 255, and the recommended maximum is 224 as this gives animations runoff room before they reset.

// LED Index to Flag is a bitmask, whether or not a certain LEDs is of a certain type. It is recommended that LEDs are set to only 1 type.

Flags :id=flags

Define Value Description
HAS_FLAGS(bits, flags) n/a Evaluates to true if bits has all flags set
HAS_ANY_FLAGS(bits, flags) n/a Evaluates to true if bits has any flags set
LED_FLAG_NONE 0x00 If this LED has no flags
LED_FLAG_ALL 0xFF If this LED has all flags
LED_FLAG_MODIFIER 0x01 If the LED is on a modifier key
LED_FLAG_KEYLIGHT 0x04 If the LED is for key backlight
LED_FLAG_INDICATOR 0x08 If the LED is for keyboard state indication

Keycodes :id=keycodes

All LED matrix keycodes are currently shared with the Backlight feature.

Key Aliases Description
QK_BACKLIGHT_TOGGLE BL_TOGG Toggle LED Matrix on or off
QK_BACKLIGHT_STEP BL_STEP Cycle through modes
QK_BACKLIGHT_ON BL_ON Turn on LED Matrix
QK_BACKLIGHT_OFF BL_OFF Turn off LED Matrix
QK_BACKLIGHT_UP BL_UP Increase the brightness level
QK_BACKLIGHT_DOWN BL_DOWN Decrease the brightness level

LED Matrix Effects :id=led-matrix-effects

These are the effects that are currently available:

enum led_matrix_effects {
    LED_MATRIX_NONE = 0,
    LED_MATRIX_SOLID = 1,           // Static single val, no speed support
    LED_MATRIX_ALPHAS_MODS,         // Static dual val, speed is val for LEDs marked as modifiers
    LED_MATRIX_BREATHING,           // Cycling brightness animation
    LED_MATRIX_BAND,                // Band fading brightness scrolling left to right
    LED_MATRIX_BAND_PINWHEEL,       // 3 blade spinning pinwheel fades brightness
    LED_MATRIX_BAND_SPIRAL,         // Spinning spiral fades brightness
    LED_MATRIX_CYCLE_LEFT_RIGHT,    // Full gradient scrolling left to right
    LED_MATRIX_CYCLE_UP_DOWN,       // Full gradient scrolling top to bottom
    LED_MATRIX_CYCLE_OUT_IN,        // Full gradient scrolling out to in
    LED_MATRIX_DUAL_BEACON,         // Full gradient spinning around center of keyboard
    LED_MATRIX_SOLID_REACTIVE_SIMPLE,   // Pulses keys hit then fades out
    LED_MATRIX_SOLID_REACTIVE_WIDE,       // Value pulses near a single key hit then fades out
    LED_MATRIX_SOLID_REACTIVE_MULTIWIDE,  // Value pulses near multiple key hits then fades out
    LED_MATRIX_SOLID_REACTIVE_CROSS,      // Value pulses the same column and row of a single key hit then fades out
    LED_MATRIX_SOLID_REACTIVE_MULTICROSS, // Value pulses the same column and row of multiple key hits then fades out
    LED_MATRIX_SOLID_REACTIVE_NEXUS,      // Value pulses away on the same column and row of a single key hit then fades out
    LED_MATRIX_SOLID_REACTIVE_MULTINEXUS, // Value pulses away on the same column and row of multiple key hits then fades out
    LED_MATRIX_SOLID_SPLASH,             // Value pulses away from a single key hit then fades out
    LED_MATRIX_SOLID_MULTISPLASH,        // Value pulses away from multiple key hits then fades out
    LED_MATRIX_WAVE_LEFT_RIGHT,           // Sine wave scrolling from left to right
    LED_MATRIX_WAVE_UP_DOWN,              // Sine wave scrolling from up to down
    LED_MATRIX_EFFECT_MAX
};

You can enable a single effect by defining ENABLE_[EFFECT_NAME] in your config.h:

Define Description
#define ENABLE_LED_MATRIX_ALPHAS_MODS Enables LED_MATRIX_ALPHAS_MODS
#define ENABLE_LED_MATRIX_BREATHING Enables LED_MATRIX_BREATHING
#define ENABLE_LED_MATRIX_BAND Enables LED_MATRIX_BAND
#define ENABLE_LED_MATRIX_BAND_PINWHEEL Enables LED_MATRIX_BAND_PINWHEEL
#define ENABLE_LED_MATRIX_BAND_SPIRAL Enables LED_MATRIX_BAND_SPIRAL
#define ENABLE_LED_MATRIX_CYCLE_LEFT_RIGHT Enables LED_MATRIX_CYCLE_LEFT_RIGHT
#define ENABLE_LED_MATRIX_CYCLE_UP_DOWN Enables LED_MATRIX_CYCLE_UP_DOWN
#define ENABLE_LED_MATRIX_CYCLE_OUT_IN Enables LED_MATRIX_CYCLE_OUT_IN
#define ENABLE_LED_MATRIX_DUAL_BEACON Enables LED_MATRIX_DUAL_BEACON
#define ENABLE_LED_MATRIX_WAVE_LEFT_RIGHT Enables LED_MATRIX_WAVE_LEFT_RIGHT
#define ENABLE_LED_MATRIX_WAVE_UP_DOWN Enables LED_MATRIX_WAVE_UP_DOWN
Reactive Defines Description
#define ENABLE_LED_MATRIX_SOLID_REACTIVE_SIMPLE Enables LED_MATRIX_SOLID_REACTIVE_SIMPLE
#define ENABLE_LED_MATRIX_SOLID_REACTIVE_WIDE Enables LED_MATRIX_SOLID_REACTIVE_WIDE
#define ENABLE_LED_MATRIX_SOLID_REACTIVE_MULTIWIDE Enables LED_MATRIX_SOLID_REACTIVE_MULTIWIDE
#define ENABLE_LED_MATRIX_SOLID_REACTIVE_CROSS Enables LED_MATRIX_SOLID_REACTIVE_CROSS
#define ENABLE_LED_MATRIX_SOLID_REACTIVE_MULTICROSS Enables LED_MATRIX_SOLID_REACTIVE_MULTICROSS
#define ENABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS Enables LED_MATRIX_SOLID_REACTIVE_NEXUS
#define ENABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS Enables LED_MATRIX_SOLID_REACTIVE_MULTINEXUS
#define ENABLE_LED_MATRIX_SOLID_SPLASH Enables LED_MATRIX_SOLID_SPLASH
#define ENABLE_LED_MATRIX_SOLID_MULTISPLASH Enables LED_MATRIX_SOLID_MULTISPLASH

?> These modes introduce additional logic that can increase firmware size.

Custom LED Matrix Effects :id=custom-led-matrix-effects

By setting LED_MATRIX_CUSTOM_USER (and/or LED_MATRIX_CUSTOM_KB) in rules.mk, new effects can be defined directly from userspace, without having to edit any QMK core files.

To declare new effects, create a new led_matrix_user/kb.inc that looks something like this:

led_matrix_user.inc should go in the root of the keymap directory. led_matrix_kb.inc should go in the root of the keyboard directory.

To use custom effects in your code, simply prepend LED_MATRIX_CUSTOM_ to the effect name specified in LED_MATRIX_EFFECT(). For example, an effect declared as LED_MATRIX_EFFECT(my_cool_effect) would be referenced with:

led_matrix_mode(led_MATRIX_CUSTOM_my_cool_effect);
// !!! DO NOT ADD #pragma once !!! //

// Step 1.
// Declare custom effects using the LED_MATRIX_EFFECT macro
// (note the lack of semicolon after the macro!)
LED_MATRIX_EFFECT(my_cool_effect)
LED_MATRIX_EFFECT(my_cool_effect2)

// Step 2.
// Define effects inside the `LED_MATRIX_CUSTOM_EFFECT_IMPLS` ifdef block
#ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS

// e.g: A simple effect, self-contained within a single method
static bool my_cool_effect(effect_params_t* params) {
  LED_MATRIX_USE_LIMITS(led_min, led_max);
  for (uint8_t i = led_min; i < led_max; i++) {
    led_matrix_set_value(i, 0xFF);
  }
  return led_matrix_check_finished_leds(led_max);
}

// e.g: A more complex effect, relying on external methods and state, with
// dedicated init and run methods
static uint8_t some_global_state;
static void my_cool_effect2_complex_init(effect_params_t* params) {
  some_global_state = 1;
}
static bool my_cool_effect2_complex_run(effect_params_t* params) {
  LED_MATRIX_USE_LIMITS(led_min, led_max);
  for (uint8_t i = led_min; i < led_max; i++) {
    led_matrix_set_value(i, some_global_state++);
  }
  return led_matrix_check_finished_leds(led_max);
}
static bool my_cool_effect2(effect_params_t* params) {
  if (params->init) my_cool_effect2_complex_init(params);
  return my_cool_effect2_complex_run(params);
}

#endif // LED_MATRIX_CUSTOM_EFFECT_IMPLS

For inspiration and examples, check out the built-in effects under quantum/led_matrix/animations/.

Additional config.h Options :id=additional-configh-options

#define LED_MATRIX_KEYRELEASES // reactive effects respond to keyreleases (instead of keypresses)
#define LED_MATRIX_TIMEOUT 0 // number of milliseconds to wait until led automatically turns off
#define LED_DISABLE_WHEN_USB_SUSPENDED // turn off effects when suspended
#define LED_MATRIX_LED_PROCESS_LIMIT (LED_MATRIX_LED_COUNT + 4) / 5 // limits the number of LEDs to process in an animation per task run (increases keyboard responsiveness)
#define LED_MATRIX_LED_FLUSH_LIMIT 16 // limits in milliseconds how frequently an animation will update the LEDs. 16 (16ms) is equivalent to limiting to 60fps (increases keyboard responsiveness)
#define LED_MATRIX_MAXIMUM_BRIGHTNESS 255 // limits maximum brightness of LEDs
#define LED_MATRIX_DEFAULT_ON true // Sets the default enabled state, if none has been set
#define LED_MATRIX_DEFAULT_MODE LED_MATRIX_SOLID // Sets the default mode, if none has been set
#define LED_MATRIX_DEFAULT_VAL LED_MATRIX_MAXIMUM_BRIGHTNESS // Sets the default brightness value, if none has been set
#define LED_MATRIX_DEFAULT_SPD 127 // Sets the default animation speed, if none has been set
#define LED_MATRIX_SPLIT { X, Y }   // (Optional) For split keyboards, the number of LEDs connected on each half. X = left, Y = Right.
                                    // If reactive effects are enabled, you also will want to enable SPLIT_TRANSPORT_MIRROR

EEPROM storage :id=eeprom-storage

The EEPROM for it is currently shared with the RGB Matrix system (it's generally assumed only one feature would be used at a time).

Direct Operation :id=direct-operation

Function Description
led_matrix_set_value_all(v) Set all of the LEDs to the given value, where v is between 0 and 255 (not written to EEPROM)
led_matrix_set_value(index, v) Set a single LED to the given value, where v is between 0 and 255, and index is between 0 and LED_MATRIX_LED_COUNT (not written to EEPROM)

Disable/Enable Effects :id=disable-enable-effects

Function Description
led_matrix_toggle() Toggle effect range LEDs between on and off
led_matrix_toggle_noeeprom() Toggle effect range LEDs between on and off (not written to EEPROM)
led_matrix_enable() Turn effect range LEDs on, based on their previous state
led_matrix_enable_noeeprom() Turn effect range LEDs on, based on their previous state (not written to EEPROM)
led_matrix_disable() Turn effect range LEDs off, based on their previous state
led_matrix_disable_noeeprom() Turn effect range LEDs off, based on their previous state (not written to EEPROM)

Change Effect Mode :id=change-effect-mode

Function Description
led_matrix_mode(mode) Set the mode, if LED animations are enabled
led_matrix_mode_noeeprom(mode) Set the mode, if LED animations are enabled (not written to EEPROM)
led_matrix_step() Change the mode to the next LED animation in the list of enabled LED animations
led_matrix_step_noeeprom() Change the mode to the next LED animation in the list of enabled LED animations (not written to EEPROM)
led_matrix_step_reverse() Change the mode to the previous LED animation in the list of enabled LED animations
led_matrix_step_reverse_noeeprom() Change the mode to the previous LED animation in the list of enabled LED animations (not written to EEPROM)
led_matrix_increase_speed() Increase the speed of the animations
led_matrix_increase_speed_noeeprom() Increase the speed of the animations (not written to EEPROM)
led_matrix_decrease_speed() Decrease the speed of the animations
led_matrix_decrease_speed_noeeprom() Decrease the speed of the animations (not written to EEPROM)
led_matrix_set_speed(speed) Set the speed of the animations to the given value where speed is between 0 and 255
led_matrix_set_speed_noeeprom(speed) Set the speed of the animations to the given value where speed is between 0 and 255 (not written to EEPROM)

Change Value :id=change-value

Function Description
led_matrix_increase_val() Increase the value for effect range LEDs. This wraps around at maximum value
led_matrix_increase_val_noeeprom() Increase the value for effect range LEDs. This wraps around at maximum value (not written to EEPROM)
led_matrix_decrease_val() Decrease the value for effect range LEDs. This wraps around at minimum value
led_matrix_decrease_val_noeeprom() Decrease the value for effect range LEDs. This wraps around at minimum value (not written to EEPROM)

Query Current Status :id=query-current-status

Function Description
led_matrix_is_enabled() Gets current on/off status
led_matrix_get_mode() Gets current mode
led_matrix_get_val() Gets current val
led_matrix_get_speed() Gets current speed
led_matrix_get_suspend_state() Gets current suspend state

Callbacks :id=callbacks

Indicators :id=indicators

If you want to set custom indicators, such as an LED for Caps Lock, or layer indication, then you can use the led_matrix_indicators_kb function on the keyboard level source file, or led_matrix_indicators_user function in the user keymap.c.

bool led_matrix_indicators_kb(void) {
    if (!led_matrix_indicators_user()) {
        return false;
    }
    led_matrix_set_value(index, value);
    return true;
}

In addition, there are the advanced indicator functions. These are aimed at those with heavily customized displays, where rendering every LED per cycle is expensive. This includes a special macro to help make this easier to use: LED_MATRIX_INDICATOR_SET_VALUE(i, v).

void led_matrix_indicators_advanced_user(uint8_t led_min, uint8_t led_max) {
    LED_MATRIX_INDICATOR_SET_VALUE(index, value);
    return false;
}