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3ce6ddcdb2
The CPU ID only differs in byte 4 (RC calibration) between devices. Add a word of warning to the documentation that this may not be very unique.
36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
/*
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* Copyright (C) 2018 RWTH Aachen, Josua Arndt, Steffen Robertz
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_atmega_common
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* @{
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*
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* @file
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* @brief Low-level CPUID driver implementation
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*
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* @author Steffen Robertz <steffen.robertz@rwth-aachen.de>
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* @author Josua Arndt <jarndt@ias.rwth-aachen.de>
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*
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* @}
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*/
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#include <stdint.h>
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#include "avr/boot.h"
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/*
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* This uses the RC calibration byte as CPU ID, so it may not be very unique.
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* The first three bytes are constant across different MCUs of the same series.
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*/
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void cpuid_get(void *id)
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{
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uint8_t *out = id;
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out[0] = boot_signature_byte_get(0x00); /* Atmel manufacturer ID (0x1E) */
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out[1] = boot_signature_byte_get(0x02); /* Part Number high byte */
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out[2] = boot_signature_byte_get(0x04); /* Part Number low byte */
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out[3] = boot_signature_byte_get(0x01); /* internal RC calibration byte */
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}
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