/* mbed Microcontroller Library * Copyright (c) 2019, Arm Limited and affiliates. * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "crc_api.h" #include "mbed_assert.h" #include "mbed_error.h" #include "cyhal_crc.h" #include "objects.h" #if DEVICE_CRC #ifdef __cplusplus extern "C" { #endif static cyhal_crc_t cy_crc; static crc_algorithm_t cy_crc_cfg; static bool cy_crc_initialized = false; void hal_crc_compute_partial_start(const crc_mbed_config_t *config) { if (!cy_crc_initialized) { if (CY_RSLT_SUCCESS != cyhal_crc_init(&cy_crc)) { MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_crc_init"); } cy_crc_initialized = true; } if (!HAL_CRC_IS_SUPPORTED(config->polynomial, config->width)) { MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_UNSUPPORTED), "unsupported CRC width"); } cy_crc_cfg.width = config->width; cy_crc_cfg.polynomial = config->polynomial; cy_crc_cfg.lfsrInitState = config->initial_xor; cy_crc_cfg.dataXor = 0; cy_crc_cfg.remXor = config->final_xor; cy_crc_cfg.dataReverse = config->reflect_in ? 1 : 0; cy_crc_cfg.remReverse = config->reflect_out ? 1 : 0; if (CY_RSLT_SUCCESS != cyhal_crc_start(&cy_crc, &cy_crc_cfg)) { MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_crc_start"); } } void hal_crc_compute_partial(const uint8_t *data, const size_t size) { MBED_ASSERT(cy_crc_initialized); if (NULL == data || 0 == size) { return; } if (CY_RSLT_SUCCESS != cyhal_crc_compute(&cy_crc, data, size)) { MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_crc_compute"); } } uint32_t hal_crc_get_result(void) { uint32_t value; if (CY_RSLT_SUCCESS != cyhal_crc_finish(&cy_crc, &value)) { MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_crc_finish"); } cyhal_crc_free(&cy_crc); cy_crc_initialized = false; return value; } #ifdef __cplusplus }; #endif #endif // DEVICE_CRC