mirror of
https://github.com/betaflight/betaflight.git
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111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
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* This file is part of Cleanflight.
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*
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* Cleanflight is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Cleanflight is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Cleanflight. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include "streambuf.h"
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uint16_t crc16_ccitt(uint16_t crc, unsigned char a)
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{
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crc ^= (uint16_t)a << 8;
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for (int ii = 0; ii < 8; ++ii) {
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if (crc & 0x8000) {
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crc = (crc << 1) ^ 0x1021;
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} else {
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crc = crc << 1;
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}
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}
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return crc;
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}
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uint16_t crc16_ccitt_update(uint16_t crc, const void *data, uint32_t length)
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{
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const uint8_t *p = (const uint8_t *)data;
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const uint8_t *pend = p + length;
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for (; p != pend; p++) {
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crc = crc16_ccitt(crc, *p);
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}
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return crc;
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}
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void crc16_ccitt_sbuf_append(sbuf_t *dst, uint8_t *start)
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{
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uint16_t crc = 0;
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const uint8_t * const end = sbufPtr(dst);
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for (const uint8_t *ptr = start; ptr < end; ++ptr) {
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crc = crc16_ccitt(crc, *ptr);
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}
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sbufWriteU16(dst, crc);
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}
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uint8_t crc8_dvb_s2(uint8_t crc, unsigned char a)
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{
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crc ^= a;
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for (int ii = 0; ii < 8; ++ii) {
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if (crc & 0x80) {
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crc = (crc << 1) ^ 0xD5;
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} else {
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crc = crc << 1;
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}
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}
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return crc;
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}
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uint8_t crc8_dvb_s2_update(uint8_t crc, const void *data, uint32_t length)
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{
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const uint8_t *p = (const uint8_t *)data;
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const uint8_t *pend = p + length;
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for (; p != pend; p++) {
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crc = crc8_dvb_s2(crc, *p);
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}
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return crc;
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}
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void crc8_dvb_s2_sbuf_append(sbuf_t *dst, uint8_t *start)
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{
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uint8_t crc = 0;
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const uint8_t * const end = dst->ptr;
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for (const uint8_t *ptr = start; ptr < end; ++ptr) {
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crc = crc8_dvb_s2(crc, *ptr);
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}
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sbufWriteU8(dst, crc);
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}
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uint8_t crc8_xor_update(uint8_t crc, const void *data, uint32_t length)
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{
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const uint8_t *p = (const uint8_t *)data;
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const uint8_t *pend = p + length;
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for (; p != pend; p++) {
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crc ^= *p;
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}
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return crc;
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}
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void crc8_xor_sbuf_append(sbuf_t *dst, uint8_t *start)
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{
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uint8_t crc = 0;
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const uint8_t *end = dst->ptr;
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for (uint8_t *ptr = start; ptr < end; ++ptr) {
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crc ^= *ptr;
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}
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sbufWriteU8(dst, crc);
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}
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