Spi with DMA problems in S32K344 using design studio

[Rmpr]

Hello,

I'm having problems sending an array with lpspi using dma.

I'm trying to send this array 5 times:

uint8 TxMasterBuffer[NUMBER_OF_BYTES] = {0xA5, 0xA5, 0x6, 0xA5, 0x7};

for(int i = 0; i<5; i++){
    	Lpspi_Ip_AsyncTransmit(&SPI_EXTERNAL_DEVICE, TxMasterBuffer, RxMasterBuffer, NUMBER_OF_BYTES, Lpspi_Ip_Callback);
    }

The problem is that it only send one time the array. When I debug it changes the received buffer but in oscilloscope I can only see one message.

Is it a problem with configuration or the dma can't support this operation? I'm using the lpspi RTD's.

[Robin_Shen]

Hi 

Do not call Lpspi_Ip_AsyncTransmit so frequently. Otherwise, I think the next few calls of Lpspi_Ip_AsyncTransmit cannot return LPSPI_IP_STATUS_SUCCESS.

Please call Lpspi_Ip_AsyncTransmit again in LPSPI_IP_EVENT_END_TRANSFER of Lpspi_Ip_Callback.

Best Regards,
Robin
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