CCS/TMS570LC4357: SPI loopback in compatible mode not working

Shivam Kakad

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Tool/software: Code Composer Studio

Hi,

I am trying the following sets of methods and the predefined functions which was generated by the HALCOGEN for tms570lc4357.

uint32 GetTxStatus,GetRxStatus = -1;

spiDAT1_t spidataconfig;

spidataconfig.CSNR = 0;
spidataconfig.CS_HOLD = false;
spidataconfig.DFSEL = SPI_FMT_0;
spidataconfig.WDEL = false;

spiInit();

//#if LOOPBACKMODE == 1
/* Enable SCI loopback */
spiEnableLoopback(spiREG1, Digital_Lbk);

GetTxStatus = spiTransmitData(spiREG1,&spidataconfig,size,&TX_DATA[0]);

GetRxStatus = spiReceiveData(spiREG1,&spidataconfig,size,&RX_DATA[0]);

where TX_DATA and RX_DATA is already defined globally.

can you please tell me what i am missing here to get the loopback working.

and what is the difference between spiTransmitData() and spiSendData(), when to use it?

Regards,

Shivam Kakad

over 6 years ago

0 Miro over 6 years ago

TI__Mastermind 21425 points

Hello,

Try with spiTransmitAndReceiveData(spiREG1,&spidataconfig,size,&TX_DATA[0],&RX_DATA[0]);

spiTransmitData() sends data using polling method and spiSendData() send data using interrupt method.

Best regards,
Miro

0 Shivam Kakad over 6 years ago in reply to Miro

Expert 1355 points

Actually i wanted to use spi with dma. as i could not able to do that i went for spi loopback self-testing.

I was referring to the sci-dma example which is provided by the Halcogen as demo example for TMS570LC4357.but could not able to execute the same on target.

I Have also referred to the "example_mibspiDMA" for the SPI-DMA communication. but could not able to clearly understand the difference between mibspi and spi. as for the MIbSPI Some DMA control (DMAxCTRL) registers are considered in the halcogen autogenrated code file(HL_reg_mibspi.h) but not in the spi files(HL_reg_spi.h). why is it so?

what i need to do for the SPI-DMA communication to work.Please Provide if working code is there.

Regards,

Shivam Kakad

0 Miro over 6 years ago in reply to Shivam Kakad

TI__Mastermind 21425 points

Hello,

You can follow what QJ suggest here:

Best regards,

Miro

0 Shivam Kakad over 6 years ago in reply to Miro

Expert 1355 points

Hi,

My code includes all the steps which were included here. But still not executing properly.

How to control the DMACTL bit for the spi in compatibility mode. as it is there for the MibSPI.

Regards,

Shivam Kakad

0 Miro over 6 years ago in reply to Shivam Kakad

TI__Mastermind 21425 points

Hello,

I'll make an example and post it.

Best regards,
Miro

0 Shivam Kakad over 6 years ago in reply to Miro

Expert 1355 points

Thanks Miro.

That will be really helpful.

Regards,

Shivam Kakad

0 Miro over 6 years ago in reply to Shivam Kakad

TI__Mastermind 21425 points

Hello,

Attached is code that transfers data using SPI1 and DMA.

1031.SPI_DMA_TMS570LC4357.ZIP

Best regards,
Miro

0 Shivam Kakad over 6 years ago in reply to Miro

Expert 1355 points

Thanks for the example. it is working for me.

But , i have a doubt why is it necessary to add the value 2 in the transmit (&(spiREG1->DAT0)) + 2) and receive buffer address.

Regards,

Shivam Kakad

0 Shivam Kakad over 6 years ago in reply to Shivam Kakad

Expert 1355 points

Hi Miro,

Here in the example i am trying to enable the dma interrupt but it is not getting. as for the sci when i tried it was working.

Any settings i need to consider?

Please Help me in this.

Regards,

Shivam Kakad

0 Miro over 6 years ago in reply to Shivam Kakad

TI__Mastermind 21425 points

Hello,

Adding 2 is for accessing TXDATA field and RXDATA field as they are occupying bits [15-0].

Best regards,
Miro

0 Shivam Kakad over 6 years ago in reply to Miro

Expert 1355 points

is it related to the big indian or little indian format?, as for the sci example there we added the +3.

Regards,

Shivam Kakad

0 Miro over 6 years ago in reply to Shivam Kakad

TI__Mastermind 21425 points

Hello,

Yes, and because SCI Data buffer is 8 bit wide it occupies bits 7-0 (address + 3).

SPI data buffers are 16 bit wide ( bits 15-0 ) and that is why we add 2.

Best regards,
Miro

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CCS/TMS570LC4357: SPI loopback in compatible mode not working