qmk_firmware/keyboards/printedpad/printedpad.h

// Copyright 2023 Noah Beidelman (@noahbei)
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#include "quantum.h"

//for oled key press
extern bool key_pressed;

// for changing oled display mode
extern uint8_t current_display_mode;

//for determining when the layer is changed and having a timer for how long we flash the layer
extern uint32_t flash_timer;
extern bool layer_changed;