2014-09-25 03:26 PM
Hi,
I have a problem with a SPI data transfer with DMA. I use a STM32L051 as SPI slave and created the code with STM32CubeMX.I used the sample code as a reference and do something like this:if (HAL_SPI_TransmitReceive_DMA(&hspi1, &txb, &rxb, 5) != HAL_OK) { /* Transfer error in transmission process */ } while (HAL_SPI_GetState(&hspi1) != HAL_SPI_STATE_READY) { HAL_Delay(1); } The transfer never completes (HAL_SPI_GetState always returns busy). The bytes are transmitted to the SPI master but the last byte is wrong (duplicated from the byte before).Before that I transfer a single byte (with the blocking function not with DMA) and that works. I also tried to use the blocking HAL function instead of the DMA version for transmitting the 5 bytes above but it also will not terminate.I've spent hours on that, any ideas anyone?Danny2014-09-26 02:42 AM
HiDanny,
Could you please specify the SPI configuration used in your example, that would help more easily figure out where a problem could be. Please try with the SPI configuration provided within the \Examples\SPI\SPI_FullDuplex_ComDMA example. Please check that you have added the call for the HAL_DMA_IRQHandler() API under the DMA IRQ handler./**
* @brief This function handles DMA Rx interrupt request.
* @param None
* @retval None
*/
void DMA1_Channel4_5_6_7_IRQHandler(void)
{
HAL_DMA_IRQHandler(SpiHandle.hdmarx);
HAL_DMA_IRQHandler(SpiHandle.hdmatx);
}
Regards,
Heisenberg.