CCS/TMDSDSK6713: Enabling McBSP Buffer FIFO (BFIFO) for DSK6713 in Code composer Studio

Ammar Ahmad Khan

Part Number: TMDSDSK6713

Tool/software: Code Composer Studio

Hi I am Ammar from NUST, Pakistan. I am working on a project related to real time voice processing in DSK6713. I need Buffer i which samples from AIC23 codec will be saved, which i think is McBSP Buffer FIFO (BFIFO). I need to know how to enable this buffer and how to access samples from this buffer for real time process.

On McBSP Manual , it says " To ensure backward compatibility with existing software, both the Read and Write FIFOs are disabled by default......... The BFIFO can be enabled/disabled and configured using the Write FIFO control register (WFIFOCTL) and the Read FIFO control register (RFIFOCTL)".

But while debugging in Code composer, in Registers, i don't see RFIFOCTL and WFIFOCTL.

McBSP Manual Picture is attached

Kindly Help

Regards

over 6 years ago

0 Mark M over 6 years ago

TI__Mastermind 30140 points

Hi Ammar,

I don't think the C6713 supports hardware FIFOs with its McBSP.
The document you referenced is for TMS320C674x not the TMS320C6713.
The C6748 does support hardware FIFOs with its McBSP, and you can see the register addresses in the C6748 datasheet - see Table 6-56. McBSP/FIFO Registers.

These FIFO registers do not appear in the C6713 datasheet under Table 16. McBSP0 and McBSP1 Registers.

Some questions for you:
What version of CCS are you using?
Does the register view show any of the McBSP registers?
What software are you starting with?

You may not require the use of the McBSP FIFO. It is primarily used when using DMA to reduce the frequency of DMA copies. The McBSP FIFO can hold multiple samples, and then the DMA can copy that block of samples to/from the McBSP. Without FIFO, the DMA would have to copy smaller blocks of samples (maybe 2 words) more often. If you just use interrupts, you can copy these samples one by one into a buffer in memory. You can still keep up with realtime with this approach if the interrupts are serviced before the sampling rate requires another sample to be read/written.

There are examples of this in the Spectrum Digital Software for this board:
c6000.spectrumdigital.com/.../

See also the C6713 Workshop materials:
processors.wiki.ti.com/.../TMS320C6x1x_DSP_Integration_Workshop

And this helpful e2e - recommends installing an older CCS version to help importing and building projects:
e2e.ti.com/.../2415166

Links to the two datasheets I mentioned...

SPRUGJ6C - TMS320C674x/OMAP-L1x Processor Multichannel Buffered Serial Port (McBSP) Interface User's Guide
- C6748 supports McBSP Buffer FIFO (BFIFO)
www.ti.com/lit/ug/sprugj6c/sprugj6c.pdf

SPRU580G - TMS320C6000 DSP Multichannel Buffered Serial Port (McBSP) Reference Guide
- C6713 does not support McBSP FIFO
www.ti.com/lit/ug/spru580g/spru580g.pdf

Regards,
Mark

0 Ammar Ahmad Khan over 6 years ago in reply to Mark M

Intellectual 420 points

Thankyou so much for your reply. That's the thing i iam looking for. Only i need to implement real time application.

Regards!!

0 Ammar Ahmad Khan over 6 years ago in reply to Ammar Ahmad Khan

Intellectual 420 points

I was working in DSK6713 which is floating point. Now i want to shift to a high speed kit DSK6455. But 6455 is Fixed point DSP kit. Will my programs run in that or not ??

0 Ammar Ahmad Khan over 6 years ago in reply to Ammar Ahmad Khan

Intellectual 420 points

Another question for you. Wll my C code for FLoating point DSK6713 run in Fixed point DSK6455 ?

0 Brad Griffis over 6 years ago in reply to Ammar Ahmad Khan

TI__Guru*** 125430 points

The c6455 contains a 64x+ DSP core which is not entirely object compatible with the 67x DSP core from the c6713. In order to maintain full compatibility, I encourage you to move to a c674x device or any device with a c66x DSP core. Both of those cores would contain the floating point instructions you need.

Your floating point C code will still run on the c6455, but it will be software-emulated floating point, so it will be roughly 100x slower.

0 Ammar Ahmad Khan over 6 years ago in reply to Brad Griffis

Intellectual 420 points

Thankyou for the reply.. But can you suggest me any DSP kit which is DSK? Because I don't have time to design PCB I need DSK, not a processor and I need High speed... I am using 6713 which is very slow and now i need to move to a high speed kit with large internal memory also

0 Brad Griffis over 6 years ago in reply to Ammar Ahmad Khan

TI__Guru*** 125430 points

Maybe this one:

http://www.ti.com/tool/TMDSEVM6657

0 Ammar Ahmad Khan over 6 years ago in reply to Brad Griffis

Intellectual 420 points

Brad Griffis said:

Maybe this one:

http://www.ti.com/tool/TMDSEVM6657

Does this support AUdio codec? Because I am working on Real TIme Audio processing

0 Brad Griffis over 6 years ago in reply to Ammar Ahmad Khan

TI__Guru*** 125430 points

No, it doesn't support audio. Perhaps a better option would be these two items:

http://www.ti.com/tool/TMDSLCDK6748

http://www.ti.com/tool/TMDSEMU110-U

The LCDK 6748 is the board, but it does not have any kind of integrated debug capabilities. The XDS110 would be the JTAG probe you would use to talk to the board.

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CCS/TMDSDSK6713: Enabling McBSP Buffer FIFO (BFIFO) for DSK6713 in Code composer Studio