b5a95bad3d
This fixes an issue where the unique device identifier is incorrectly copied from an address on the AHB bus to memory using memcpy. I verified corrected behavior by comparing `hwinfo devid` command output to memory view of the SoC using the debugger. Signed-off-by: Bryce Wilkins <bryce.wilkins@gmail.com>
40 lines
745 B
C
40 lines
745 B
C
/*
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* Copyright (c) 2021 NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT nxp_lpc_uid
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#include <zephyr/drivers/hwinfo.h>
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#include <string.h>
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#include <zephyr/sys/byteorder.h>
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#define UID_WORD_COUNT (DT_INST_REG_SIZE(0) / sizeof(uint32_t))
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struct uid {
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uint32_t id[UID_WORD_COUNT];
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};
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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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volatile const uint32_t * const uid_addr = (uint32_t *) DT_INST_REG_ADDR(0);
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struct uid dev_id;
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if (buffer == NULL) {
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return 0;
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}
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for (size_t i = 0 ; i < UID_WORD_COUNT ; i++) {
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dev_id.id[i] = sys_cpu_to_be32(uid_addr[i]);
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}
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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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