feat(util): add esp_crc8 for efuse check

This commit is contained in:
Wu Jian Gang
2018-06-28 19:32:06 +08:00
parent 8a90670956
commit 1f2f10c7d4
2 changed files with 52 additions and 6 deletions

View File

@ -12,8 +12,8 @@
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ROM_CRC_H
#define ROM_CRC_H
#ifndef __CRC_H_
#define __CRC_H_
#include <stdint.h>
@ -115,6 +115,17 @@ uint8_t crc8_le(uint8_t crc, uint8_t const *buf, uint32_t len);
*/
uint8_t crc8_be(uint8_t crc, uint8_t const *buf, uint32_t len);
/**
* @brief A crc8 algorithm used in efuse check.
*
* @param uint8_t const *p : Pointer to original data.
*
* @param uint32_t len : Data length in byte.
*
* @return uint8_t: Crc value.
*/
uint8_t esp_crc8(uint8_t const *p, uint32_t len);
/**
* @}
*/

View File

@ -1,5 +1,20 @@
// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdint.h>
#include <stdbool.h>
#include "crc.h"
static const uint32_t crc32_le_table[256] = {
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L,
@ -18,7 +33,7 @@ static const uint32_t crc32_le_table[256] = {
0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L,
0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL,
0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L,
0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L,
0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L,
@ -43,9 +58,29 @@ uint32_t crc32_le(uint32_t crc, const uint8_t *buf, uint32_t len)
crc = ~crc;
for (i = 0; i < len; i++){
for (i = 0; i < len; i++) {
crc = crc32_le_table[(crc ^ buf[i]) & 0xff] ^ (crc >> 8);
}
return ~crc;
}
}
uint8_t esp_crc8(uint8_t const *p, uint32_t len)
{
uint8_t i;
uint8_t crc = 0;
while (len--) {
crc = crc ^ (*p++);
for (i = 0; i < 8; i++) {
if (crc & 0x01) {
crc = (crc >> 1) ^ 0x8c;
} else {
crc = crc >> 1;
}
}
}
return crc;
}