mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_Cypress/TARGET_PSOC6/crc_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 189:f392fc9709a3 1 /* mbed Microcontroller Library
AnnaBridge 189:f392fc9709a3 2 * Copyright (c) 2019 Cypress Semiconductor Corporation
AnnaBridge 189:f392fc9709a3 3 * SPDX-License-Identifier: Apache-2.0
AnnaBridge 189:f392fc9709a3 4 *
AnnaBridge 189:f392fc9709a3 5 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 189:f392fc9709a3 6 * you may not use this file except in compliance with the License.
AnnaBridge 189:f392fc9709a3 7 * You may obtain a copy of the License at
AnnaBridge 189:f392fc9709a3 8 *
AnnaBridge 189:f392fc9709a3 9 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 189:f392fc9709a3 10 *
AnnaBridge 189:f392fc9709a3 11 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 189:f392fc9709a3 12 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 189:f392fc9709a3 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 189:f392fc9709a3 14 * See the License for the specific language governing permissions and
AnnaBridge 189:f392fc9709a3 15 * limitations under the License.
AnnaBridge 189:f392fc9709a3 16 */
AnnaBridge 189:f392fc9709a3 17
AnnaBridge 189:f392fc9709a3 18 #include "device.h"
AnnaBridge 189:f392fc9709a3 19
AnnaBridge 189:f392fc9709a3 20 #if DEVICE_CRC
AnnaBridge 189:f392fc9709a3 21
AnnaBridge 189:f392fc9709a3 22 #include "mbed_assert.h"
AnnaBridge 189:f392fc9709a3 23 #include "crc_api.h"
AnnaBridge 189:f392fc9709a3 24
AnnaBridge 189:f392fc9709a3 25 #include "psoc6_utils.h"
AnnaBridge 189:f392fc9709a3 26
AnnaBridge 189:f392fc9709a3 27 #include "cy_crypto_core_crc.h"
AnnaBridge 189:f392fc9709a3 28
AnnaBridge 189:f392fc9709a3 29 static uint32_t crcWidth = 0;
AnnaBridge 189:f392fc9709a3 30 static uint32_t crcShift = 0;
AnnaBridge 189:f392fc9709a3 31 static uint32_t crcXorMask;
AnnaBridge 189:f392fc9709a3 32
AnnaBridge 189:f392fc9709a3 33 /* Cypress CRYPTO HW supports ANY CRC algorithms from CRC-3 to CRC-32 */
AnnaBridge 189:f392fc9709a3 34 bool hal_crc_is_supported(const crc_mbed_config_t *config)
AnnaBridge 189:f392fc9709a3 35 {
AnnaBridge 189:f392fc9709a3 36 return (config != NULL);
AnnaBridge 189:f392fc9709a3 37 }
AnnaBridge 189:f392fc9709a3 38
AnnaBridge 189:f392fc9709a3 39 void hal_crc_compute_partial_start(const crc_mbed_config_t *config)
AnnaBridge 189:f392fc9709a3 40 {
AnnaBridge 189:f392fc9709a3 41 uint32_t myMask = 0;
AnnaBridge 189:f392fc9709a3 42
AnnaBridge 189:f392fc9709a3 43 if (!hal_crc_is_supported(config) || (cy_reserve_crypto(CY_CRYPTO_CRC_HW) != 0))
AnnaBridge 189:f392fc9709a3 44 {
AnnaBridge 189:f392fc9709a3 45 return;
AnnaBridge 189:f392fc9709a3 46 }
AnnaBridge 189:f392fc9709a3 47
AnnaBridge 189:f392fc9709a3 48 crcWidth = config->width;
AnnaBridge 189:f392fc9709a3 49
AnnaBridge 189:f392fc9709a3 50 crcShift = (uint32_t)(!config->reflect_out) * (crcWidth & 7u);
AnnaBridge 189:f392fc9709a3 51 if (crcShift) {
AnnaBridge 189:f392fc9709a3 52 crcShift = 8u - crcShift;
AnnaBridge 189:f392fc9709a3 53 for (uint32_t i = 0; i < crcShift; i++) {
AnnaBridge 189:f392fc9709a3 54 myMask |= 1 << i;
AnnaBridge 189:f392fc9709a3 55 }
AnnaBridge 189:f392fc9709a3 56 crcXorMask = config->final_xor & myMask;
AnnaBridge 189:f392fc9709a3 57 }
AnnaBridge 189:f392fc9709a3 58
AnnaBridge 189:f392fc9709a3 59 Cy_Crypto_Core_Crc_CalcInit(CRYPTO, config->width,
AnnaBridge 189:f392fc9709a3 60 config->polynomial,
AnnaBridge 189:f392fc9709a3 61 config->reflect_in,
AnnaBridge 189:f392fc9709a3 62 0,
AnnaBridge 189:f392fc9709a3 63 config->reflect_out,
AnnaBridge 189:f392fc9709a3 64 config->final_xor >> crcShift,
AnnaBridge 189:f392fc9709a3 65 config->initial_xor);
AnnaBridge 189:f392fc9709a3 66 }
AnnaBridge 189:f392fc9709a3 67
AnnaBridge 189:f392fc9709a3 68 void hal_crc_compute_partial(const uint8_t *data, const size_t size)
AnnaBridge 189:f392fc9709a3 69 {
AnnaBridge 189:f392fc9709a3 70 if ((data == NULL) || (size <= 0) || (crcWidth == 0)) {
AnnaBridge 189:f392fc9709a3 71 return;
AnnaBridge 189:f392fc9709a3 72 }
AnnaBridge 189:f392fc9709a3 73
AnnaBridge 189:f392fc9709a3 74 Cy_Crypto_Core_Crc_CalcPartial(CRYPTO, data, size);
AnnaBridge 189:f392fc9709a3 75 }
AnnaBridge 189:f392fc9709a3 76
AnnaBridge 189:f392fc9709a3 77 uint32_t hal_crc_get_result(void)
AnnaBridge 189:f392fc9709a3 78 {
AnnaBridge 189:f392fc9709a3 79 uint32_t result = 0;
AnnaBridge 189:f392fc9709a3 80
AnnaBridge 189:f392fc9709a3 81 if (crcWidth == 0) {
AnnaBridge 189:f392fc9709a3 82 return 0xffffffffu;
AnnaBridge 189:f392fc9709a3 83 }
AnnaBridge 189:f392fc9709a3 84
AnnaBridge 189:f392fc9709a3 85 Cy_Crypto_Core_Crc_CalcFinish(CRYPTO, crcWidth, &result);
AnnaBridge 189:f392fc9709a3 86
AnnaBridge 189:f392fc9709a3 87 if (crcShift) {
AnnaBridge 189:f392fc9709a3 88 result = result << crcShift;
AnnaBridge 189:f392fc9709a3 89 result = result ^ crcXorMask;
AnnaBridge 189:f392fc9709a3 90 }
AnnaBridge 189:f392fc9709a3 91
AnnaBridge 189:f392fc9709a3 92 crcWidth = 0;
AnnaBridge 189:f392fc9709a3 93
AnnaBridge 189:f392fc9709a3 94 cy_free_crypto(CY_CRYPTO_CRC_HW);
AnnaBridge 189:f392fc9709a3 95
AnnaBridge 189:f392fc9709a3 96 return result;
AnnaBridge 189:f392fc9709a3 97 }
AnnaBridge 189:f392fc9709a3 98
AnnaBridge 189:f392fc9709a3 99 #endif //DEVICE_CRC
AnnaBridge 189:f392fc9709a3 100