qmk-dactyl-manuform-a/keyboards/clueboard/66/rev4/rev4.c

#include "rev4.h"

void matrix_init_kb(void) {
    led_init_ports();

    matrix_init_user();
}

void led_init_ports() {
    // Set our LED pins as output
    setPinOutput(B13); // LED1
    writePinLow(B13);
    setPinOutput(B14); // LED2
    writePinLow(B14);
    setPinOutput(A8); // LED3
    writePinLow(A8);
    setPinOutput(A0); // Capslock LED
    writePinLow(A0);
}

bool led_update_kb(led_t led_state) {
    bool res = led_update_user(led_state);
    if(res) {
        writePin(B13, led_state.num_lock);
        writePin(A0, led_state.caps_lock);
        writePin(B14, led_state.caps_lock);
        writePin(A8, led_state.scroll_lock);
    }
    return res;
}