TMS320F28377D: SPI Receive Data Error

Is it just the CCS Registers window that displays the incorrect value or does reading DRR1 into a variable also put an incorrect value in the variable? Can you confirm that your pin muxing for the DR pin is correct?

Whitney

Dear Whitney:

I'm transferring MCBSP to SPI port. In order to verify whether it is a hardware problem, I configure these four pins into SPI first, and observe the data sent and received by CPLD communication. When configuring SPI, there is no problem with the data sent and received. But if these four ports are configured as SPI ports of MCBSP extension, the data received will be problematic. McbspbReg.DRR1.all = 0xFF, and always 0xFF(I sent with 16 bits).

It seems that the input bus has been pulled up all the time. But the level of GPIO ports entering the DSP is correct, not all of them are high. I don't know where the configuration went wrong. Here's my initialization configuration:

McbspaRegs.SPCR2.all=0x0000; // Reset FS generator, sample rate// generator & transmitter
McbspaRegs.SPCR1.all=0x0000; // Reset Receiver, Right justify word

McbspaRegs.PCR.bit.all = 0x0F08; 
McbspaRegs.SPCR1.bit.DLB = 0; 

McbspaRegs.SPCR1.bit.CLKSTP = 3; 
McbspaRegs.PCR.bit.CLKXP = 0;
McbspaRegs.PCR.bit.CLKRP = 1;

McbspaRegs.RCR2.bit.RDATDLY = 01; // RX data delay is 1 bit
McbspaRegs.XCR2.bit.XDATDLY = 01; // TX data delay is 1 bit

McbspaRegs.RCR1.bit.RWDLEN1 = 2; // 16-BIts word
McbspaRegs.XCR1.bit.xWDLEN1 = 01; // 16-BIts word

McbspaRegs.SRGR2.bit.all = 0x2000; 
McbspaRegs.SRGR1.bit.all = 19; 

McbspaRegs.SPCR2.GRST=1; 
delay_loop();
McbspaRegs.SPCR2.XRST=1; 
McbspaRegs.SPCR1.RRST=1; 
McbspaRegs.SPCR2.FRST=1;

Best regards

Dear Whitney:

Wait for your reply.

Thank you.