OMAPL138 16-bit SPI/EDMA transfers via PSP - alterations from 8-bit transfer

barry mohan

Hi Again

Still have no replies to this post

http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/168604.aspx#615313

Has anyone tried or had issues getting 16-bit SPI transfers to work with DSP as master interfacing to a FPGA. Our 8-bit transfers work without issue though can't understand why the 16-bit transfers only increment addresses by a byte each time (described with pretty pictures hey..hey.. in the above link)?

Or perhaps the question to ask is

What is required to convert a 8-bit SPI/EDMA3 transfer to a 16-bit SPI/EDMA3 transfer (we are using the GIO_submit() invocation) ?

Can post additional details as needed...

Many Thanks

Barry

over 13 years ago

0 Norman Wong over 13 years ago

Guru 26430 points

PSP 01.30.01 does not support 16-bit SPI EDMA transfers. Just plain bad incomplete code. It's fixed in PSP 02.10.01. TI did not back port the changes. It seems the older BIOS5 support has been dropped. I had to manually back port the fixes myself. Details here:

http://e2e.ti.com/support/embedded/bios/f/355/t/130781.aspx

0 Raghavendra Maddikery over 13 years ago

TI__Expert 5500 points

Hi Barry,

There is a bug in the SPI driver.

This is known issue, and has been fixed. This will be taken care(available) in the next upcoming releases. For now, please find the diffrence report of Spi_edma.c file attached, and modify it accordingly(right file has the bug fix).

Hope this helps..

Best Regards,

Raghavendra

0 Norman Wong over 13 years ago in reply to Raghavendra Maddikery

Guru 26430 points

I found that I had to make changes to spi.c as well. About 12 lines worth. I posted the changes files here:

http://e2e.ti.com/support/embedded/bios/f/355/t/130781.aspx

Here's the diff

1778.spi_c_diff.txt

0 barry mohan over 13 years ago in reply to Norman Wong

Intellectual 580 points

Thanks Raghavendra,Norman

Looks like we have a concensus from one and all. Thanks for the prompt replies - will try this now.

Barry

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OMAPL138 16-bit SPI/EDMA transfers via PSP - alterations from 8-bit transfer