QMK Flash backlighting

/*  https://www.reddit.com/r/olkb/comments/po9skn/how_do_i_flash_the_leds_on_the_dz60_on_every/
 *  Code to briefly flash backlighting on every keypress.
 *  Every keypress will turn backlighting on.
 *  The backlighting will turn off BACKLIGHT_FLASH_TIME milliseconds after the most recent keypress.
 *  This goes in keymap.c
 *
 *  *Note 1: the number of backlight levels is defined in config.h, or defaults to 3.  31 is the max allowed number of levels.
 *  Change '31' to below this value to flash the LEDs at a lower brightness.
 */

#define BACKLIGHT_FLASH_TIME 200  //configure flash time in milliseconds

uint16_t last_keydown_time = 0;  //marks the time of last keydown event

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    if (record->event.pressed) {           //when any key is pressed
        last_keydown_time = timer_read();  //update last_keydown_time to now
        backlight_level_noeeprom(31);      //set backlight level to 31 (max possible) *Note 1
    }

    switch (keycode) {
        //macro code
    }
    return true;
}


void matrix_scan_user(void) {
    if (get_backlight_level()) {  //if backlight is on (level is not zero)
        if (timer_elapsed(last_keydown_time) > BACKLIGHT_FLASH_TIME) {  //if last keydown was more than BACKLIGHT_FLASH_TIME ms ago
            backlight_level_noeeprom(0);  //turn backlight off
        }
    }
}