@waclawek.jan Thank you for your response. It seems my question is a bit misleading and incomplete. So to complete my question, I have two SPIs. One is a full duplex master and the other one is a full duplex slave. When the sensor transmit data ready signal, the spi transmit start in external interrupt routine and put data into a circular buffer.
void EXTI1_IRQHandler(void)
{
/* USER CODE BEGIN EXTI1_IRQn 0 */
uint8_t pDatar[27],pDatat[27];
HAL_StatusTypeDef spiTransCheck = HAL_SPI_TransmitReceive(&hspi1, pDatat,pDatar, 27);
if (spiTransCheck == HAL_OK)
circularbufput(circbuf,pDatar);
else
printf("Oh no SPi transfer failed")
/* USER CODE END EXTI1_IRQn 0 */
HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_1);
/* USER CODE BEGIN EXTI1_IRQn 1 */
/* USER CODE END EXTI1_IRQn 1 */
}
This works in general. If I change
HAL_SPI_TransmitReceive(&hspi1, pDatat,pDatar, 27,100);
to
HAL_SPI_TransmitReceive_DMA(&hspi1, pDatat,pDatar, 27);
It fails and jump to HardFault_Handler. Sad.
Then when data is processed, the first MCU which is in contact with the sensor sends a data ready pulse to the second MCU and says, hey master, processed data is ready, send clock to get the data. This is in the main loop of the program
HAL_SPI_TransmitReceive_DMA(&hspi2, pTxData, pRxData, 30);
HAL_GPIO_WritePin(DRDY_GPIO_Port, DRDY_Pin, GPIO_PIN_SET);
HAL_GPIO_WritePin(DRDY_GPIO_Port, DRDY_Pin, GPIO_PIN_RESET);
What I suspect the most is that since cube generate dma interrupt priority to be of highest priority (0), then if a simultaneous interrupt and DMA request come in, The priority would have been given to DMA not external interrupt
This is the full story.
