mirror of https://github.com/ARMmbed/mbed-os.git
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/* mbed Microcontroller Library
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* (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2018 All rights reserved
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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 <stdbool.h>
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#include "crc_api.h"
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#include "device.h"
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#ifdef DEVICE_CRC
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static uint32_t final_xor;
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bool hal_crc_is_supported(const crc_mbed_config_t *config)
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{
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if (config == NULL) {
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return false;
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}
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// Currently supported only CRC16_CCITT polynomial.
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if (config->polynomial != POLY_16BIT_CCITT) {
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return false;
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}
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if (config->width != 16) {
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return false;
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}
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// Not support for reflect_in and reflect_out.
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if ((config->reflect_in == true) || (config->reflect_out == true)) {
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return false;
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}
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return true;
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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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TSB_CG_FSYSENB_IPENB20 = 1;
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// Intial Value as initial_xor
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TSB_CRC->CLC = config->initial_xor;
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final_xor = config->final_xor;
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// Data width setting CRC data width is 8 bits.
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// Form setting CRC form is CRC16.
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TSB_CRC->TYP = 0x01;
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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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if (data && size) {
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uint32_t index = 0U;
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for(index = 0U; index < size; index++) {
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TSB_CRC->DIN = data[index];
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}
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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 result;
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// Note: Please read [CRCCLC] twice and use the result of the 2nd time
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result = TSB_CRC->CLC;
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result = TSB_CRC->CLC ^ final_xor;
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return (result);
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}
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#endif // DEVICE_CRC
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