TMS570LS3137: DMA SPI Communication Problem

Hello,

You can use SPI loopback (internal loopback, don't require wire on your board) on TMS570 side to check if the received data is correct. If the received data is the same as the txed data, please check the code in F28377 side.

Hello, 

I tried loopbacks on both MCUs. In loopback configuration both MCUs work properly. However communication between MCUs is still not correct. 

For F28377D spi and dma initialization is as follow: 

SPI:

SpibRegs.SPIFFCT.all=0x0; // place SPI in reset

SpibRegs.SPIFFRX.all=0x2040; // RX FIFO enabled, clear FIFO int
SpibRegs.SPIFFRX.bit.RXFFIL = FIFO_LVL; // Set RX FIFO level
SpibRegs.SPIFFTX.all=0xE040; // FIFOs enabled, TX FIFO released,
SpibRegs.SPIFFTX.bit.TXFFIL = FIFO_LVL; // Set TX FIFO level

SpibRegs.SPICCR.all =0x000F; // Reset on, rising edge, 16-bit char bit
SpibRegs.SPICTL.all =0x0002; // Enable slave mode, phase = 0,// enable talk, and SPI int disabled.

SpibRegs.SPIBRR.all =0x0009; // Baud rate = LSPCLK/10 = 10 MHz
SpibRegs.SPICCR.all =0x008F; // Relinquish SPI from Reset

SpibRegs.SPIPRI.bit.FREE = 1; // Set so breakpoints don't disturb xmission

DMA:

//Initialize DMA
DMAInitialize();

DMASource = (volatile Uint16 *)sdata;
DMADest = (volatile Uint16 *)rdata;

// configure DMACH5 for TX
DMACH5AddrConfig(&SpibRegs.SPITXBUF,DMASource);
DMACH5BurstConfig(BURST,1,0); // Burst size, src step, dest step
DMACH5TransferConfig(TRANSFER,1,0); // transfer size, src step, dest step
DMACH5ModeConfig(DMA_SPIBTX,PERINT_ENABLE,ONESHOT_DISABLE,CONT_ENABLE
,SYNC_DISABLE,SYNC_SRC,OVRFLOW_DISABLE,SIXTEEN_BIT,CHINT_END,CHINT_ENABLE);

// configure DMA CH2 for RX
DMACH6AddrConfig(DMADest,&SpibRegs.SPIRXBUF);
DMACH6BurstConfig(BURST,0,1);
DMACH6TransferConfig(TRANSFER,0,1);
DMACH6ModeConfig(DMA_SPIBRX,PERINT_ENABLE,ONESHOT_DISABLE,CONT_ENABLE,
SYNC_DISABLE,SYNC_SRC,OVRFLOW_DISABLE,SIXTEEN_BIT,CHINT_END,CHINT_ENABLE);

Thanks in advance.

Osman

Hello Osman,

I am not familiar to F28377 device. During TMS570 transfers data to F28377, did you monitor the data pattern on SPI bus (SIMO)?

Hello, 

No, I couldn't monitor SIMO and it is hard to monitor due to board that we used. Any other suggestion? 

Thanks in advance, 

Osman

In your loopback test, the received data is the same as the TXed data. I think the code in transmitter side (TMS570) is fine.