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https://github.com/zephyrproject-rtos/zephyr
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8c749ffc0a
The unique identifier for this platform is a 96-bit value, where the upper 56 bits provide an ASCII encoding of the lot number, and the lower 40 bits provide the wafer number and X, Y position on the wafer. Extract the value into big-endian form for device-independent interpretation. Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
32 lines
595 B
C
32 lines
595 B
C
/*
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* Copyright (c) 2018 Alexander Wachter
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <soc.h>
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#include <drivers/hwinfo.h>
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#include <string.h>
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#include <sys/byteorder.h>
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struct stm32_uid {
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u32_t id[3];
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};
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ssize_t z_impl_hwinfo_get_device_id(u8_t *buffer, size_t length)
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{
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struct stm32_uid dev_id;
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dev_id.id[0] = sys_cpu_to_be32(LL_GetUID_Word2());
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dev_id.id[1] = sys_cpu_to_be32(LL_GetUID_Word1());
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dev_id.id[2] = sys_cpu_to_be32(LL_GetUID_Word0());
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if (length > sizeof(dev_id.id)) {
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length = sizeof(dev_id.id);
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}
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memcpy(buffer, dev_id.id, length);
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return length;
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}
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