mirror of https://github.com/ARMmbed/mbed-os.git
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
#include "crc_api.h"
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#include "device.h"
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#include "platform/mbed_assert.h"
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#ifdef DEVICE_CRC
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static CRC_HandleTypeDef current_state;
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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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if (config->polynomial != POLY_32BIT_ANSI) {
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return false;
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}
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if (config->width != 32) {
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return false;
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}
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if ((config->final_xor != 0xFFFFFFFFU) && (config->final_xor != 0)) {
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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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MBED_ASSERT(hal_crc_is_supported(config));
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__HAL_RCC_CRC_CLK_ENABLE();
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final_xor = config->final_xor;
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current_state.Instance = CRC;
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current_state.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;
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current_state.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE;
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current_state.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_DISABLE;
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current_state.Init.InitValue = config->initial_xor;
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current_state.Init.CRCLength = CRC_POLYLENGTH_32B;
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current_state.Init.InputDataInversionMode =
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config->reflect_in ? CRC_INPUTDATA_INVERSION_BYTE
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: CRC_INPUTDATA_INVERSION_NONE;
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current_state.Init.OutputDataInversionMode =
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config->reflect_out ? CRC_OUTPUTDATA_INVERSION_ENABLE
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: CRC_OUTPUTDATA_INVERSION_DISABLE;
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HAL_CRC_Init(¤t_state);
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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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HAL_CRC_Accumulate(¤t_state, (uint32_t *)data, size);
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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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const uint32_t result = current_state.Instance->DR;
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return (final_xor == 0xFFFFFFFFU) ? ~result : result;
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}
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#endif // DEVICE_CRC
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