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Add standardized CRC helper functions (#4798)

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Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
Mat931
2023-07-30 21:45:56 +00:00
committed by GitHub
parent 9aa5ee3372
commit 98bf427600
6 changed files with 104 additions and 97 deletions
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esphome/core/helpers.cpp
+89 -11
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@@ -34,6 +34,9 @@
#include <limits>
#include <random>
#endif
#ifdef USE_ESP32
#include "esp32/rom/crc.h"
#endif
#ifdef USE_ESP32_IGNORE_EFUSE_MAC_CRC
#include "esp_efuse.h"
@@ -44,6 +47,23 @@ namespace esphome {
static const char *const TAG = "helpers";
static const uint16_t CRC16_A001_LE_LUT_L[] = {0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440};
static const uint16_t CRC16_A001_LE_LUT_H[] = {0x0000, 0xcc01, 0xd801, 0x1400, 0xf001, 0x3c00, 0x2800, 0xe401,
0xa001, 0x6c00, 0x7800, 0xb401, 0x5000, 0x9c01, 0x8801, 0x4400};
#ifndef USE_ESP32
static const uint16_t CRC16_8408_LE_LUT_L[] = {0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7};
static const uint16_t CRC16_8408_LE_LUT_H[] = {0x0000, 0x1081, 0x2102, 0x3183, 0x4204, 0x5285, 0x6306, 0x7387,
0x8408, 0x9489, 0xa50a, 0xb58b, 0xc60c, 0xd68d, 0xe70e, 0xf78f};
static const uint16_t CRC16_1021_BE_LUT_L[] = {0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef};
static const uint16_t CRC16_1021_BE_LUT_H[] = {0x0000, 0x1231, 0x2462, 0x3653, 0x48c4, 0x5af5, 0x6ca6, 0x7e97,
0x9188, 0x83b9, 0xb5ea, 0xa7db, 0xd94c, 0xcb7d, 0xfd2e, 0xef1f};
#endif
// STL backports
#if _GLIBCXX_RELEASE < 7
@@ -76,21 +96,79 @@ uint8_t crc8(uint8_t *data, uint8_t len) {
}
return crc;
}
uint16_t crc16(const uint8_t *data, uint8_t len) {
uint16_t crc = 0xFFFF;
while (len--) {
crc ^= *data++;
for (uint8_t i = 0; i < 8; i++) {
if ((crc & 0x01) != 0) {
crc >>= 1;
crc ^= 0xA001;
} else {
crc >>= 1;
uint16_t crc16(const uint8_t *data, uint16_t len, uint16_t crc, uint16_t reverse_poly, bool refin, bool refout) {
#ifdef USE_ESP32
if (reverse_poly == 0x8408) {
crc = crc16_le(refin ? crc : (crc ^ 0xffff), data, len);
return refout ? crc : (crc ^ 0xffff);
}
#endif
if (refin) {
crc ^= 0xffff;
}
#ifndef USE_ESP32
if (reverse_poly == 0x8408) {
while (len--) {
uint8_t combo = crc ^ (uint8_t) *data++;
crc = (crc >> 8) ^ CRC16_8408_LE_LUT_L[combo & 0x0F] ^ CRC16_8408_LE_LUT_H[combo >> 4];
}
} else
#endif
if (reverse_poly == 0xa001) {
while (len--) {
uint8_t combo = crc ^ (uint8_t) *data++;
crc = (crc >> 8) ^ CRC16_A001_LE_LUT_L[combo & 0x0F] ^ CRC16_A001_LE_LUT_H[combo >> 4];
}
} else {
while (len--) {
crc ^= *data++;
for (uint8_t i = 0; i < 8; i++) {
if (crc & 0x0001) {
crc = (crc >> 1) ^ reverse_poly;
} else {
crc >>= 1;
}
}
}
}
return crc;
return refout ? (crc ^ 0xffff) : crc;
}
uint16_t crc16be(const uint8_t *data, uint16_t len, uint16_t crc, uint16_t poly, bool refin, bool refout) {
#ifdef USE_ESP32
if (poly == 0x1021) {
crc = crc16_be(refin ? crc : (crc ^ 0xffff), data, len);
return refout ? crc : (crc ^ 0xffff);
}
#endif
if (refin) {
crc ^= 0xffff;
}
#ifndef USE_ESP32
if (poly == 0x1021) {
while (len--) {
uint8_t combo = (crc >> 8) ^ *data++;
crc = (crc << 8) ^ CRC16_1021_BE_LUT_L[combo & 0x0F] ^ CRC16_1021_BE_LUT_H[combo >> 4];
}
} else {
#endif
while (len--) {
crc ^= (((uint16_t) *data++) << 8);
for (uint8_t i = 0; i < 8; i++) {
if (crc & 0x8000) {
crc = (crc << 1) ^ poly;
} else {
crc <<= 1;
}
}
}
#ifndef USE_ESP32
}
#endif
return refout ? (crc ^ 0xffff) : crc;
}
uint32_t fnv1_hash(const std::string &str) {
uint32_t hash = 2166136261UL;
for (char c : str) {