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97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2025 OpenMV, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// Only compile for STM32 families with configurable CRC hardware
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#include STM32_HAL_H
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#include "omv_crc.h"
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#include <stdbool.h>
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#if defined(STM32F7) || defined(STM32H7) || defined(STM32N6)
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static CRC_HandleTypeDef hcrc = {0};
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static bool crc_initialized = false;
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static void omv_crc_init(void) {
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hcrc.Instance = CRC;
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hcrc.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;
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hcrc.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_DISABLE;
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hcrc.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_DISABLE;
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hcrc.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_NONE;
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hcrc.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;
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hcrc.Init.CRCLength = CRC_POLYLENGTH_32B;
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hcrc.Init.InitValue = OMV_CRC32_INIT;
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hcrc.Init.GeneratingPolynomial = OMV_CRC32_POLY;
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HAL_CRC_Init(&hcrc);
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crc_initialized = true;
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}
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uint16_t omv_crc16_start(const void *buf, size_t len) {
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if (!crc_initialized) {
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omv_crc_init();
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}
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// Set CRC16 polynomial and length directly
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WRITE_REG(hcrc.Instance->POL, OMV_CRC16_POLY);
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MODIFY_REG(hcrc.Instance->CR, CRC_CR_POLYSIZE, CRC_POLYLENGTH_16B);
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if (len == 0) {
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return OMV_CRC16_INIT;
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}
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return (uint16_t) HAL_CRC_Calculate(&hcrc, (uint32_t *) buf, len);
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}
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uint16_t omv_crc16_update(uint16_t crc, const void *buf, size_t len) {
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if (len == 0) {
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return crc;
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}
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return (uint16_t) HAL_CRC_Accumulate(&hcrc, (uint32_t *) buf, len);
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}
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uint32_t omv_crc32_start(const void *buf, size_t len) {
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if (!crc_initialized) {
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omv_crc_init();
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}
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// Set CRC32 polynomial and length directly
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WRITE_REG(hcrc.Instance->POL, OMV_CRC32_POLY);
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MODIFY_REG(hcrc.Instance->CR, CRC_CR_POLYSIZE, CRC_POLYLENGTH_32B);
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if (len == 0) {
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return OMV_CRC32_INIT;
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}
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return HAL_CRC_Calculate(&hcrc, (uint32_t *) buf, len);
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}
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uint32_t omv_crc32_update(uint32_t crc, const void *buf, size_t len) {
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if (len == 0) {
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return crc;
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}
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return HAL_CRC_Accumulate(&hcrc, (uint32_t *) buf, len);
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}
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#endif // STM32F7 || STM32H7 || STM32N6
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