mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_STM/mbed_crc_api.c
- Revision:
- 189:f392fc9709a3
- Parent:
- 187:0387e8f68319
--- a/targets/TARGET_STM/mbed_crc_api.c Thu Nov 08 11:46:34 2018 +0000 +++ b/targets/TARGET_STM/mbed_crc_api.c Wed Feb 20 22:31:08 2019 +0000 @@ -3,30 +3,61 @@ #include "platform/mbed_assert.h" -#ifdef DEVICE_CRC +#if DEVICE_CRC static CRC_HandleTypeDef current_state; static uint32_t final_xor; +static uint32_t crc_mask; +/* STM32 CRC preipheral features + +-------------------------+-----------------------+---------------+---------------+ + | Feature | F1/L1/F2/F4 series | F0 series (#1)| L0/F3/L4/F7 | + +-========================+=======================+===============+===============+ + | Reversibility option | NO | YES | + | on I/O data | | | + +-------------------------+-----------------------+---------------+---------------+ + | CRC initial Value | Fixed to 0xFFFFFFFF | Programmable | Programmable | + | | | on 32 bits | on 8,16,32 | + +-------------------------+-----------------------+---------------+---------------+ + | Handled data size in bit| 32 | 8,16,32 | + +-------------------------+---------------------------------------+---------------+ + | Polynomial size in bit | 32 | 7,8,16,32 | + +-------------------------+---------------------------------------+---------------+ + | Polynomial coefficients | Fixed to 0x4C11DB7 | Programmable | + +-------------------------+---------------------------------------+---------------+ + + #1 The STM32F0 series which supported polynomial in 7, 8, 16, 32 bits as below list: + STM32F071xB + STM32F072xB + STM32F078xx + STM32F091xC + STM32F098xx +*/ bool hal_crc_is_supported(const crc_mbed_config_t *config) { if (config == NULL) { return false; } - if (config->polynomial != POLY_32BIT_ANSI) { - return false; - } - - if (config->width != 32) { +#if defined(TARGET_STM32F1) || defined(TARGET_STM32F2) || defined(TARGET_STM32F4) || defined(TARGET_STM32L1) + /* Currently, mbed supported input data format fix on bytes, + so those devices are not supported at default. */ + return false; +#elif !defined(CRC_POLYLENGTH_7B) + /* Some targets are not support polynomial in 7, 8, 16 bits, ex. STM32F070RB, + so those devices are not supported at default. */ + return false; +#else + if (config->width != 32 && config->width != 16 && config->width != 8 && config->width != 7) { return false; } + return true; +#endif +} - if ((config->final_xor != 0xFFFFFFFFU) && (config->final_xor != 0)) { - return false; - } - - return true; +static uint32_t get_crc_mask(int width) +{ + return (width < 8 ? ((1u << 8) - 1) : (uint32_t)((uint64_t)(1ull << width) - 1)); } void hal_crc_compute_partial_start(const crc_mbed_config_t *config) @@ -36,21 +67,46 @@ __HAL_RCC_CRC_CLK_ENABLE(); final_xor = config->final_xor; + crc_mask = get_crc_mask(config->width); current_state.Instance = CRC; +#if !defined(TARGET_STM32F1) && !defined(TARGET_STM32F2) && !defined(TARGET_STM32F4) && !defined(TARGET_STM32L1) && defined(CRC_POLYLENGTH_7B) current_state.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES; - current_state.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE; current_state.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_DISABLE; + current_state.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_DISABLE; current_state.Init.InitValue = config->initial_xor; - current_state.Init.CRCLength = CRC_POLYLENGTH_32B; + current_state.Init.GeneratingPolynomial = config->polynomial; + + switch (config->width) + { + case HAL_CRC_LENGTH_32B: + current_state.Init.CRCLength = CRC_POLYLENGTH_32B; + break; + case HAL_CRC_LENGTH_16B: + current_state.Init.CRCLength = CRC_POLYLENGTH_16B; + break; + case HAL_CRC_LENGTH_8B: + current_state.Init.CRCLength = CRC_POLYLENGTH_8B; + break; + case HAL_CRC_LENGTH_7B: + current_state.Init.CRCLength = CRC_POLYLENGTH_7B; + break; + default: + MBED_ASSERT(false); + break; + } + current_state.Init.InputDataInversionMode = config->reflect_in ? CRC_INPUTDATA_INVERSION_BYTE : CRC_INPUTDATA_INVERSION_NONE; current_state.Init.OutputDataInversionMode = config->reflect_out ? CRC_OUTPUTDATA_INVERSION_ENABLE : CRC_OUTPUTDATA_INVERSION_DISABLE; +#endif - HAL_CRC_Init(¤t_state); + if (HAL_CRC_Init(¤t_state) != HAL_OK) { + MBED_ASSERT(false); + } } void hal_crc_compute_partial(const uint8_t *data, const size_t size) @@ -62,9 +118,29 @@ uint32_t hal_crc_get_result(void) { - const uint32_t result = current_state.Instance->DR; + uint32_t result = current_state.Instance->DR; - return (final_xor == 0xFFFFFFFFU) ? ~result : result; +#if !defined(TARGET_STM32F1) && !defined(TARGET_STM32F2) && !defined(TARGET_STM32F4) && !defined(TARGET_STM32L1) && defined(CRC_POLYLENGTH_7B) + /* The CRC-7 SD needs to shift left by 1 bit after obtaining the result, but the output + * inversion of CRC peripheral will convert the result before shift left by 1 bit, so + * the result seems to have shifted after the conversion. + * + * Example: + * [Gerenal setps] + * 1. Before output inversion: 0x75 (0111 0101) + * 2. Left shift by 1 bit: 0xEA (1110 1010) + * 3. After output inversion: 0x57 (0101 0111) + * + * [STM32 CRC peripheral steps] + * 1. Before output inversion: 0x75 (0111 0101) + * 2. After output inversion: 0x57 (0101 0111) <= no needs shift again + */ + if (current_state.Init.CRCLength == CRC_POLYLENGTH_7B && + current_state.Init.GeneratingPolynomial == POLY_7BIT_SD && + current_state.Init.OutputDataInversionMode == CRC_OUTPUTDATA_INVERSION_DISABLE) + result = result << 1; +#endif + return (result ^ final_xor) & crc_mask; } #endif // DEVICE_CRC