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https://github.com/zephyrproject-rtos/zephyr
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1668c21e17
Resources indicate that CFG2 holds the upper 32 bits, and CFG1 the lower 32 bits, of a 64-bit unique identifier. Store it in big-endian format so it reads correctly when accessed as a byte sequence. https://community.nxp.com/docs/DOC-94459 Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
31 lines
531 B
C
31 lines
531 B
C
/*
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* Copyright (c) 2019 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 imxrt_uid {
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u32_t id[2];
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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 imxrt_uid dev_id;
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dev_id.id[0] = sys_cpu_to_be32(OCOTP->CFG2);
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dev_id.id[1] = sys_cpu_to_be32(OCOTP->CFG1);
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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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