mirror of https://github.com/ARMmbed/mbed-os.git
94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2019, Arm Limited and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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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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#include "crc_api.h"
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#include "mbed_assert.h"
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#include "mbed_error.h"
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#include "cyhal_crc.h"
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#if DEVICE_CRC
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#ifdef __cplusplus
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extern "C" {
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#endif
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static cyhal_crc_t cy_crc;
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static crc_algorithm_t cy_crc_cfg;
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static bool cy_crc_initialized = false;
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bool hal_crc_is_supported(const crc_mbed_config_t *config)
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{
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return config->width <= 32;
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}
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void hal_crc_compute_partial_start(const crc_mbed_config_t *config)
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{
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if (!cy_crc_initialized) {
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if (CY_RSLT_SUCCESS != cyhal_crc_init(&cy_crc)) {
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MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_crc_init");
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}
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cy_crc_initialized = true;
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}
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if (!hal_crc_is_supported(config)) {
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MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_UNSUPPORTED), "unsupported CRC width");
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}
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cy_crc_cfg.width = config->width;
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cy_crc_cfg.polynomial = config->polynomial;
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cy_crc_cfg.lfsrInitState = config->initial_xor;
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cy_crc_cfg.dataXor = 0;
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cy_crc_cfg.remXor = config->final_xor;
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cy_crc_cfg.dataReverse = config->reflect_in ? 1 : 0;
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cy_crc_cfg.remReverse = config->reflect_out ? 1 : 0;
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if (CY_RSLT_SUCCESS != cyhal_crc_start(&cy_crc, &cy_crc_cfg)) {
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MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_crc_start");
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}
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}
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void hal_crc_compute_partial(const uint8_t *data, const size_t size)
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{
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MBED_ASSERT(cy_crc_initialized);
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if (NULL == data || 0 == size) {
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return;
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}
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if (CY_RSLT_SUCCESS != cyhal_crc_compute(&cy_crc, data, size)) {
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MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_crc_compute");
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}
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}
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uint32_t hal_crc_get_result(void)
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{
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uint32_t value;
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if (CY_RSLT_SUCCESS != cyhal_crc_finish(&cy_crc, &value)) {
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MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_crc_finish");
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}
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cyhal_crc_free(&cy_crc);
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cy_crc_initialized = false;
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// mbed expects result to be aligned unusually in this case
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if (0 != (cy_crc_cfg.width % 8) && 0 == cy_crc_cfg.remReverse) {
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value ^= cy_crc_cfg.remXor; // Undo result XOR
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value <<= 8 - (cy_crc_cfg.width % 8); // Left align to nearest byte
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value ^= cy_crc_cfg.remXor; // Redo result XOR
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}
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return value;
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}
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#ifdef __cplusplus
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};
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#endif
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#endif // DEVICE_CRC
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