2023-12-07 03:39:09 +00:00
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/* Copyright 2023 Dual Tachyon
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* https://github.com/DualTachyon
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may 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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* http://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,
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* WITHOUT 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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2023-12-17 04:23:45 +00:00
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#include "../bsp/dp32g030/crc.h"
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#include "crc.h"
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2023-12-07 03:39:09 +00:00
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void CRC_Init(void)
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{
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CRC_CR =
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CRC_CR_CRC_EN_BITS_DISABLE |
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CRC_CR_INPUT_REV_BITS_NORMAL |
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CRC_CR_INPUT_INV_BITS_BIT_INVERTED |
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CRC_CR_OUTPUT_REV_BITS_REVERSED |
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CRC_CR_OUTPUT_INV_BITS_BIT_INVERTED |
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CRC_CR_DATA_WIDTH_BITS_8 |
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CRC_CR_CRC_SEL_BITS_CRC_16_CCITT;
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CRC_IV = 0;
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}
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#ifdef ENABLE_MDC1200
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void CRC_InitReverse(void)
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{
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CRC_CR =
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CRC_CR_CRC_EN_BITS_DISABLE |
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CRC_CR_INPUT_REV_BITS_NORMAL |
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CRC_CR_INPUT_INV_BITS_BIT_INVERTED |
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CRC_CR_OUTPUT_REV_BITS_REVERSED |
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CRC_CR_OUTPUT_INV_BITS_BIT_INVERTED |
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CRC_CR_DATA_WIDTH_BITS_8 |
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CRC_CR_CRC_SEL_BITS_CRC_16_CCITT;
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CRC_IV = 0;
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}
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#endif
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#define CRC16_XMODEM_POLY 0x1021
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uint16_t CRC_Calculate1( void *pBuffer, uint16_t Size)
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{
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uint8_t *pData = ( uint8_t *)pBuffer;
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uint16_t crc = 0; // 初始CRC值为0
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while (Size--) {
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crc ^= (*pData++) << 8; // 将数据字节的最高位与CRC异或
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for (uint8_t i = 0; i < 8; i++) {
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if (crc & 0x8000) { // 检查最高位是否为1
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crc = (crc << 1) ^ CRC16_XMODEM_POLY; // 如果最高位为1，执行CRC多项式计算
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} else {
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crc = crc << 1; // 如果最高位为0，继续左移
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}
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}
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}
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return crc;
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}
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//uint16_t CRC_Calculate( void *pBuffer, uint16_t Size) {
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//
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// unsigned int i;
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// uint8_t *data8 = ( uint8_t *)pBuffer;
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// uint16_t crc = 0;
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// for (i = 0; i < Size; i++)
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// {
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// unsigned int k;
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// crc ^= data8[i];
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// for (k = 8; k > 0; k--)
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// crc = (crc & 1u) ? (crc >> 1) ^ 0x8408 : crc >> 1;
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// }
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// return crc ^ 0xffff;
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//}
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uint16_t CRC_Calculate(const void *buffer, const unsigned int size)
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{
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const uint8_t *data = (const uint8_t *)buffer;
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uint16_t i;
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uint16_t crc;
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CRC_CR = (CRC_CR & ~CRC_CR_CRC_EN_MASK) | CRC_CR_CRC_EN_BITS_ENABLE;
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for (i = 0; i < size; i++)
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CRC_DATAIN = data[i];
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crc = (uint16_t)CRC_DATAOUT;
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CRC_CR = (CRC_CR & ~CRC_CR_CRC_EN_MASK) | CRC_CR_CRC_EN_BITS_DISABLE;
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return crc;
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}
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