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