going from normal SPI to dma, no call back.

[ulao]

I got my SPI5 running the way I want it but now I want to move to DMA. When I do this the SPI lines remain low after sending its data. So I assume my config is off. Using the IOC to make changes I only see the fowling added.

   /* SPI5 DMA Init */
 
    /* SPI5_TX Init */
 hdma_spi5_tx.Instance = DMA2_Stream3;
 hdma_spi5_tx.Init.Request = DMA_REQUEST_SPI5_TX;
 hdma_spi5_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
 hdma_spi5_tx.Init.PeriphInc = DMA_PINC_DISABLE;
 hdma_spi5_tx.Init.MemInc = DMA_MINC_ENABLE;
 hdma_spi5_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
 hdma_spi5_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
 hdma_spi5_tx.Init.Mode = DMA_NORMAL;
 hdma_spi5_tx.Init.Priority = DMA_PRIORITY_VERY_HIGH;
 hdma_spi5_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
 
 if (HAL_DMA_Init(&hdma_spi5_tx) != HAL_OK)
 {
 Error_Handler();
 }
 
 __HAL_LINKDMA(hspi,hdmatx,hdma_spi5_tx);
 
 /* SPI5_RX Init */
 hdma_spi5_rx.Instance = DMA2_Stream0;
 hdma_spi5_rx.Init.Request = DMA_REQUEST_SPI5_RX;
 hdma_spi5_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
 hdma_spi5_rx.Init.PeriphInc = DMA_PINC_DISABLE;
 hdma_spi5_rx.Init.MemInc = DMA_MINC_ENABLE;
 hdma_spi5_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
 hdma_spi5_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
 hdma_spi5_rx.Init.Mode = DMA_NORMAL;
 hdma_spi5_rx.Init.Priority = DMA_PRIORITY_VERY_HIGH;
 hdma_spi5_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
 
 if (HAL_DMA_Init(&hdma_spi5_rx) != HAL_OK)
 {
 Error_Handler();
 }
 
 __HAL_LINKDMA(hspi,hdmarx,hdma_spi5_rx);
 
 
 
//added this to dma init
	__HAL_RCC_DMA2_CLK_ENABLE();
	HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
	HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
 
	HAL_NVIC_SetPriority(DMA2_Stream3_IRQn, 0, 0);
	HAL_NVIC_EnableIRQ(DMA2_Stream3_IRQn);

and I did change to

HAL_SPI_TransmitReceive_DMA(&hspi5, (uint8_t*)data_to_send, (uint8_t*)&FromTheADC, sizeof(data_to_send));

  

but HAL_SPI_TxRxCpltCallback is never called.

if I change my rx to DMA_CIRCULAR it just loop over and over.

In debug I see the call back is set, no errors are given and the call back was not hit.

I'm using the nss and have the int set

   HAL_NVIC_SetPriority(SPI5_IRQn, 1, 0);

   HAL_NVIC_EnableIRQ(SPI5_IRQn);

nss does come back up but the code is stuck waiting in my while loop.

[ulao]

looking back in to this I noticed here that SPI5_IRQHandler is not getting called AND the dmi stream TX irq is ( BUT NOT THE RX). I see the code does hit __HAL_SPI_ENABLE_IT in the HAL_SPI_TransmitReceive_DMA

look thru the code I'm not sure who calls SPI5_IRQHandler, I see no reference of it being called.

[ulao]

issue was stream 0, I had to use DMA2_Stream2, I now get the SPi working and send correctly but for some reason the RX data is not making it to memory.

I tried to simplify it with this but still no data.

   uint8_t data_to_rec[12];
 
   memset(data_to_rec,0,12);
 
   HAL_SPI_TransmitReceive_DMA(&hspi5, (uint16_t*) &data_to_send, (uint16_t*) &data_to_rec, sizeof(data_to_send));
 
 

[ulao]

ahhh..

reading online DMA may need the variable to be in a section.

so I tried

with

  .dma_buffer :

 {

  . = ALIGN(4);

  *(.dma_buffer)

 } >RAM_D2

and that worked