94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
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* Copyright (c) 2021 ARM Limited. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* ----------------------------------------------------------------------
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*
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* $Date: 27. May 2021
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* $Revision: V1.0.0
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*
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* Project: CMSIS-DAP Examples LPC-Link2
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* Title: ser_num.c CMSIS-DAP Serial Number module for LPC-Link2
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*
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*---------------------------------------------------------------------------*/
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "ser_num.h"
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// Serial Number
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#define SER_NUM_PREFIX "00A1"
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static char SerialNum[32];
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#define IAP_LOCATION *(volatile unsigned int *)(0x10400100)
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#define IAP_READ_DEVICE_SERIAL_NUMBER 58U
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typedef void (*IAP)(unsigned int [],unsigned int[]);
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/**
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\brief Calculate 32-bit CRC (polynom: 0x04C11DB7, init value: 0xFFFFFFFF)
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\param[in] data pointer to data
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\param[in] len data length (in bytes)
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\return CRC32 value
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*/
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static uint32_t crc32 (const uint8_t *data, uint32_t len) {
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uint32_t crc32;
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uint32_t n;
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crc32 = 0xFFFFFFFFU;
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while (len != 0U) {
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crc32 ^= ((uint32_t)*data++) << 24U;
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for (n = 8U; n; n--) {
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if (crc32 & 0x80000000U) {
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crc32 <<= 1U;
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crc32 ^= 0x04C11DB7U;
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} else {
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crc32 <<= 1U;
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}
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}
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len--;
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}
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return (crc32);
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}
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/**
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\brief Get serial number string. First characters are fixed. Last eight
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characters are Unique (calculated from devices's unique ID)
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\return Serial number string or NULL (callculation of unique ID failed)
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*/
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char *GetSerialNum (void) {
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uint32_t command_param[5];
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uint32_t status_result[5];
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uint32_t uid;
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char *str;
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IAP iap_entry;
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memset(command_param, 0, sizeof(command_param));
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memset(status_result, 0, sizeof(status_result));
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iap_entry = (IAP)IAP_LOCATION;
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command_param[0] = IAP_READ_DEVICE_SERIAL_NUMBER;
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iap_entry(command_param, status_result);
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str = NULL;
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if (status_result[0] == 0U) {
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uid = crc32 ((uint8_t *)&status_result[1], 16U);
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snprintf(SerialNum, sizeof(SerialNum), "%s%08X", SER_NUM_PREFIX, uid);
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str = SerialNum;
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}
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return (str);
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}
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