mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

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

targets/TARGET_STM/mbed_crc_api.c@186:707f6e361f3e, 2018-06-22 (annotated)

Committer:
Anna Bridge
Date:
Fri Jun 22 16:45:37 2018 +0100
Revision:
186:707f6e361f3e
Child:
187:0387e8f68319
mbed-dev library. Release version 162

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 #include "crc_api.h"
Anna Bridge 186:707f6e361f3e 2 #include "device.h"
Anna Bridge 186:707f6e361f3e 3
Anna Bridge 186:707f6e361f3e 4 #include "platform/mbed_assert.h"
Anna Bridge 186:707f6e361f3e 5
Anna Bridge 186:707f6e361f3e 6 #ifdef DEVICE_CRC
Anna Bridge 186:707f6e361f3e 7
Anna Bridge 186:707f6e361f3e 8 static CRC_HandleTypeDef current_state;
Anna Bridge 186:707f6e361f3e 9 static uint32_t final_xor;
Anna Bridge 186:707f6e361f3e 10
Anna Bridge 186:707f6e361f3e 11 bool hal_crc_is_supported(const crc_mbed_config_t* config)
Anna Bridge 186:707f6e361f3e 12 {
Anna Bridge 186:707f6e361f3e 13 if (config == NULL) {
Anna Bridge 186:707f6e361f3e 14 return false;
Anna Bridge 186:707f6e361f3e 15 }
Anna Bridge 186:707f6e361f3e 16
Anna Bridge 186:707f6e361f3e 17 if (config->polynomial != POLY_32BIT_ANSI) {
Anna Bridge 186:707f6e361f3e 18 return false;
Anna Bridge 186:707f6e361f3e 19 }
Anna Bridge 186:707f6e361f3e 20
Anna Bridge 186:707f6e361f3e 21 if (config->width != 32) {
Anna Bridge 186:707f6e361f3e 22 return false;
Anna Bridge 186:707f6e361f3e 23 }
Anna Bridge 186:707f6e361f3e 24
Anna Bridge 186:707f6e361f3e 25 if ((config->final_xor != 0xFFFFFFFFU) && (config->final_xor != 0)) {
Anna Bridge 186:707f6e361f3e 26 return false;
Anna Bridge 186:707f6e361f3e 27 }
Anna Bridge 186:707f6e361f3e 28
Anna Bridge 186:707f6e361f3e 29 return true;
Anna Bridge 186:707f6e361f3e 30 }
Anna Bridge 186:707f6e361f3e 31
Anna Bridge 186:707f6e361f3e 32 void hal_crc_compute_partial_start(const crc_mbed_config_t* config)
Anna Bridge 186:707f6e361f3e 33 {
Anna Bridge 186:707f6e361f3e 34 MBED_ASSERT(hal_crc_is_supported(config));
Anna Bridge 186:707f6e361f3e 35
Anna Bridge 186:707f6e361f3e 36 __HAL_RCC_CRC_CLK_ENABLE();
Anna Bridge 186:707f6e361f3e 37
Anna Bridge 186:707f6e361f3e 38 final_xor = config->final_xor;
Anna Bridge 186:707f6e361f3e 39
Anna Bridge 186:707f6e361f3e 40 current_state.Instance = CRC;
Anna Bridge 186:707f6e361f3e 41 current_state.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;
Anna Bridge 186:707f6e361f3e 42 current_state.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE;
Anna Bridge 186:707f6e361f3e 43 current_state.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_DISABLE;
Anna Bridge 186:707f6e361f3e 44 current_state.Init.InitValue = config->initial_xor;
Anna Bridge 186:707f6e361f3e 45 current_state.Init.CRCLength = CRC_POLYLENGTH_32B;
Anna Bridge 186:707f6e361f3e 46 current_state.Init.InputDataInversionMode =
Anna Bridge 186:707f6e361f3e 47 config->reflect_in ? CRC_INPUTDATA_INVERSION_BYTE
Anna Bridge 186:707f6e361f3e 48 : CRC_INPUTDATA_INVERSION_NONE;
Anna Bridge 186:707f6e361f3e 49 current_state.Init.OutputDataInversionMode =
Anna Bridge 186:707f6e361f3e 50 config->reflect_out ? CRC_OUTPUTDATA_INVERSION_ENABLE
Anna Bridge 186:707f6e361f3e 51 : CRC_OUTPUTDATA_INVERSION_DISABLE;
Anna Bridge 186:707f6e361f3e 52
Anna Bridge 186:707f6e361f3e 53 HAL_CRC_Init(&current_state);
Anna Bridge 186:707f6e361f3e 54 }
Anna Bridge 186:707f6e361f3e 55
Anna Bridge 186:707f6e361f3e 56 void hal_crc_compute_partial(const uint8_t *data, const size_t size)
Anna Bridge 186:707f6e361f3e 57 {
Anna Bridge 186:707f6e361f3e 58 if (data && size) {
Anna Bridge 186:707f6e361f3e 59 HAL_CRC_Accumulate(&current_state, (uint32_t *)data, size);
Anna Bridge 186:707f6e361f3e 60 }
Anna Bridge 186:707f6e361f3e 61 }
Anna Bridge 186:707f6e361f3e 62
Anna Bridge 186:707f6e361f3e 63 uint32_t hal_crc_get_result(void)
Anna Bridge 186:707f6e361f3e 64 {
Anna Bridge 186:707f6e361f3e 65 const uint32_t result = current_state.Instance->DR;
Anna Bridge 186:707f6e361f3e 66
Anna Bridge 186:707f6e361f3e 67 return (final_xor == 0xFFFFFFFFU) ? ~result : result;
Anna Bridge 186:707f6e361f3e 68 }
Anna Bridge 186:707f6e361f3e 69
Anna Bridge 186:707f6e361f3e 70 #endif // DEVICE_CRC