TMS320F28P550SJ: How to make spi work with dma

Hi Jeffrey,

Thank you for your question. Can you please tell me what specific error you see when you try to run the example?

Thanks,

Ira

Hi Ira,

Please take a look of this example code from "spi_ex5_loopback_dma.c ":

// DMA Channel 6 ISR
//
__interrupt void INT_mySPI0_RX_DMA_ISR(void)

{
        uint16_t i;

        DMA_stopChannel(mySPI0_RX_DMA_BASE);
        Interrupt_clearACKGroup(INT_mySPI0_RX_DMA_INTERRUPT_ACK_GROUP);

       //
       // Check for data integrity
       //
       for(i = 0; i < 128; i++)
      {
              if (rData[i] != i)
              {
                     // Something went wrong. rData doesn't contain expected data.
                     ESTOP0;
               }
       }

        done = 1;
        return;
}

If DMA works, it will transfer sData[] to rData[] via spi loopback. As here, sData[] = 0, 1, 2, 3, ....

If rData[] are not as 0, 1, 2, 3, .. it will ESTOP. 

The result is rData[] are all 0.

Thanks,

Jeffrey

Hi Jeffrey,

Thank you for your patience. I was able to replicate your issue on my end. I tried running the same example from C2000Ware_5_05_0_0 and C2000Ware_6_0_0_0 and they were working fine. I was able to see the sdata in rdata. I would recommend upgrading to a newer version of C2000Ware where this example has been fixed.

Thanks,

Ira

Hi Ira,

The issue is rData[] all 0 after running. 

Thanks,

Jeffrey 

Hi Jeffrey,

Did you try it with the same example from C2000Ware_5_05_00_00? With this I was able to see the correct rdata[] after running it.

Thanks,

Ira