39 lines
1004 B
C
39 lines
1004 B
C
/*
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* Copyright (c) 2019 Leandro A. F. Pereira
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* Copyright (c) 2020 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <soc/efuse_reg.h>
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#include <drivers/hwinfo.h>
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#include <string.h>
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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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uint32_t rdata1 = sys_read32(EFUSE_BLK0_RDATA1_REG);
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uint32_t rdata2 = sys_read32(EFUSE_BLK0_RDATA2_REG);
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uint8_t id[6];
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/* The first word provides the lower 32 bits of the MAC
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* address; the low 16 bits of the second word provide the
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* upper 16 bytes of the MAC address. The upper 16 bits are
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* (apparently) a checksum, and reserved. See ESP32 Technical
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* Reference Manual V4.1 section 20.5.
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*/
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id[0] = (uint8_t)(rdata2 >> 8);
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id[1] = (uint8_t)(rdata2 >> 0);
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id[2] = (uint8_t)(rdata1 >> 24);
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id[3] = (uint8_t)(rdata1 >> 16);
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id[4] = (uint8_t)(rdata1 >> 8);
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id[5] = (uint8_t)(rdata1 >> 0);
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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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