qmk-firmware/keyboards/vision_division/vision_division.c

#include "vision_division.h"

void matrix_init_kb(void) {
	// put your keyboard start-up code here
	// runs once when the firmware starts up

	matrix_init_user();
}

void matrix_scan_kb(void) {
	// put your looping keyboard code here
	// runs every cycle (a lot)

	matrix_scan_user();
}

bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
	// put your per-action keyboard code here
	// runs for every action, just before processing by the firmware

	return process_record_user(keycode, record);
}

void led_set_kb(uint8_t usb_led) {
	// put your keyboard LED indicator (ex: Caps Lock LED) toggling code here

  if (usb_led & (1 << USB_LED_CAPS_LOCK))
  {
    // HI
    DDRD  |= (1<<4);
    PORTD |= (1<<4);
  }
  else
  {
    // Hi-Z
    DDRD  &= ~(1<<4);
    PORTD &= ~(1<<4);
  }

  if (usb_led & (1 << USB_LED_NUM_LOCK))
  {
    // HI
    DDRD  |= (1<<5);
    PORTD |= (1<<5);
  }
  else
  {
    // Hi-Z
    DDRD  &= ~(1<<5);
    PORTD &= ~(1<<5);
  }

  if (usb_led & (1 << USB_LED_SCROLL_LOCK))
  {
    // HI
    DDRD  |= (1<<6);
    PORTD |= (1<<6);
  }
  else
  {
    // Hi-Z
    DDRD  &= ~(1<<6);
    PORTD &= ~(1<<6);
  }

	led_set_user(usb_led);
}