qmk_firmware/keyboards/dz60/dz60.c

#include "dz60.h"

void led_set_kb(uint8_t usb_led) {
    if (usb_led & (1 << USB_LED_CAPS_LOCK)) {
        DDRB |= (1 << 2); PORTB &= ~(1 << 2);
    } else {
        DDRB &= ~(1 << 2); PORTB &= ~(1 << 2);
    }
}