What is de CRC16 used on SPI peripheral? the Polynomial is configurable, but the init value and reverse or not, is not documented.
I have a SPI on STM32F746 configured:
/* SPI6 init function */
void MX_SPI6_Init(void)
{
hspi6.Instance = SPI6;
hspi6.Init.Mode = SPI_MODE_MASTER;
hspi6.Init.Direction = SPI_DIRECTION_2LINES;
hspi6.Init.DataSize = SPI_DATASIZE_16BIT;
hspi6.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi6.Init.CLKPhase = SPI_PHASE_2EDGE;
hspi6.Init.NSS = SPI_NSS_HARD_OUTPUT;
hspi6.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
hspi6.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi6.Init.TIMode = SPI_TIMODE_DISABLE;
hspi6.Init.CRCCalculation = SPI_CRCCALCULATION_ENABLE;
hspi6.Init.CRCPolynomial = 32773;
hspi6.Init.CRCLength = SPI_CRC_LENGTH_16BIT;
hspi6.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
if (HAL_SPI_Init(&hspi6) != HAL_OK)
{
Error_Handler();
}
}
void HAL_SPI_MspInit(SPI_HandleTypeDef* spiHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(spiHandle->Instance==SPI2)
{
/* USER CODE BEGIN SPI2_MspInit 0 */
/* USER CODE END SPI2_MspInit 0 */
/* SPI2 clock enable */
__HAL_RCC_SPI2_CLK_ENABLE();
__HAL_RCC_GPIOI_CLK_ENABLE();
/**SPI2 GPIO Configuration
PI1 ------> SPI2_SCK
PI2 ------> SPI2_MISO
PI3 ------> SPI2_MOSI
*/
GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;
HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
/* USER CODE BEGIN SPI2_MspInit 1 */
/* USER CODE END SPI2_MspInit 1 */
}
else if(spiHandle->Instance==SPI6)
{
/* USER CODE BEGIN SPI6_MspInit 0 */
/* USER CODE END SPI6_MspInit 0 */
/* SPI6 clock enable */
__HAL_RCC_SPI6_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOG_CLK_ENABLE();
/**SPI6 GPIO Configuration
PA4 ------> SPI6_NSS
PA5 ------> SPI6_SCK
PA6 ------> SPI6_MISO
PG14 ------> SPI6_MOSI
*/
GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_SPI6;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_14;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI6;
HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
/* SPI6 DMA Init */
/* SPI6_RX Init */
hdma_spi6_rx.Instance = DMA2_Stream6;
hdma_spi6_rx.Init.Channel = DMA_CHANNEL_1;
hdma_spi6_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_spi6_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_spi6_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_spi6_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_spi6_rx.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma_spi6_rx.Init.Mode = DMA_NORMAL;
hdma_spi6_rx.Init.Priority = DMA_PRIORITY_LOW;
hdma_spi6_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_spi6_rx) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(spiHandle,hdmarx,hdma_spi6_rx);
/* SPI6_TX Init */
hdma_spi6_tx.Instance = DMA2_Stream5;
hdma_spi6_tx.Init.Channel = DMA_CHANNEL_1;
hdma_spi6_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_spi6_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_spi6_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_spi6_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_spi6_tx.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma_spi6_tx.Init.Mode = DMA_NORMAL;
hdma_spi6_tx.Init.Priority = DMA_PRIORITY_LOW;
hdma_spi6_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_spi6_tx) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(spiHandle,hdmatx,hdma_spi6_tx);
/* USER CODE BEGIN SPI6_MspInit 1 */
/* USER CODE END SPI6_MspInit 1 */
}
}