qmk-firmware/platforms/hardware_id.h

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// Copyright 2022 QMK
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <stdint.h>
/** \brief Storage for a hardware ID
*
* Ensure this is sized to cover all hardware scenarios
*/
typedef struct hardware_id_t {
uint32_t data[4];
} hardware_id_t;
/** \brief Query the devices "unique" ID
*/
hardware_id_t get_hardware_id(void);