TMS320C6748: Unable to write to mcbsp0fifo

AAAA PPPP

Part Number: TMS320C6748

Hello,

I am using tms320c6748 lcdk kit. I am trying to do a loopback test of mcbsp0. When I try to write to the mcbsp0 control registers , I am able to do it successfully. When I try to write to mcbsp0 fifo registers no value is written.Suppose if I want to write to MCBSP_FIFO_WFIFOCTL register I give

HWREG( 0x01d11810) =0x00000200;

then the value is not written to register. I run this statement ,breakpoint at next statement and go to register view in CCS and see register is not updated. Why does this happen? Also there is no mcbsp1 fifo registers seen in register view. Please help me to solve this.

what should I do specially to set these registers?

Thanks in advance

With Regards

Shalini

over 6 years ago

0 Cvetolin Shulev-XID over 6 years ago

TI__Guru 65405 points

The team is notified. They will post their feedback directly here.

BR
Tsvetolin Shulev

0 Sahin Okur over 6 years ago

TI__Mastermind 27355 points

Hi Shalini,

Can you verify that the buffer FIFO is enabled? This can be done via the WFIFOCTL.WENA/RFIFOCTL.RENA bits. Note that they must be enabled prior to initializing the receive/transmit sections (see www.ti.com/.../sprugj6c.pdf ).

Also, is this based on one of our examples? If so I can try reproducing this on my end.

0 AAAA PPPP over 6 years ago in reply to Sahin Okur

Expert 1410 points

Hello,

I am unable to set even WFIFOCTL.WENA bit to 1. I give
HWREG( 0x01d11810) =0x00010000;
but in rgiste view the bit is not set. Why do this happen?
Where is mcbsp1fifo in register view?

With Regards
Shalini

0 Sahin Okur over 6 years ago in reply to AAAA PPPP

TI__Mastermind 27355 points

Hi Shalini,

Are you able to set the bit using the Registers view? I'm able to do this on my end with the lcdkc6748.

0 AAAA PPPP over 6 years ago in reply to Sahin Okur

Expert 1410 points

Hello ,

I am unable to do this. Please share program with which you did this. So that I can check.

Thanks in advance

With Regards
Shalini

0 Sahin Okur over 6 years ago in reply to AAAA PPPP

TI__Mastermind 27355 points

Hi Shalini,

This can be done in CCS by going to View -> Registers. The registers will appear after connecting to the core. You can then change the bits directly in the register window. If you right click on WFIFOCTL and select "View Memory at Address," you can see what hex value has been written to it.

0 AAAA PPPP over 6 years ago in reply to Sahin Okur

Expert 1410 points

Hello,

Thanks for reply. I know to look in registers window. I meant when I looked in registers window , I was not able to see bit required set.So I asked program so I can burn in to device and check if it is being written.

With Regards
Shalini

0 Sahin Okur over 6 years ago in reply to AAAA PPPP

TI__Mastermind 27355 points

Hi Shalini,

I didn't load any example onto the core. You can change the register bit directly from the registers window. Can you see if you are able to do that? What are your values for WNUMEVT & WNUMDMA?

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TMS320C6748: Unable to write to mcbsp0fifo