35 lines
715 B
C
35 lines
715 B
C
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/*
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* Copyright (c) 2022 Yonatan Schachter
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include <drivers/hwinfo.h>
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#include <hardware/flash.h>
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#define FLASH_RUID_DATA_BYTES 8
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ssize_t z_impl_hwinfo_get_device_id(uint8_t *buffer, size_t length)
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{
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uint8_t id[FLASH_RUID_DATA_BYTES];
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uint32_t key;
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/*
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* flash_get_unique_id temporarily disables XIP to query the
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* flash for its ID. If the CPU is interrupted while XIP is
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* disabled, it will halt. Therefore, interrupts must be disabled
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* before fetching the ID.
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*/
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key = irq_lock();
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flash_get_unique_id(id);
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irq_unlock(key);
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if (length > sizeof(id)) {
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length = sizeof(id);
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}
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memcpy(buffer, id, length);
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return length;
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}
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