TDA4VH-Q1: DMA cannot work when DFMT is transpose

haijun

Intellectual 575 points

Part Number: TDA4VH-Q1
Other Parts Discussed in Thread: TDA4VH

I'm working on TDA4VH with sdk0805, and I want to use dma to copy a matrix of 2x2.

when I created a TR like this, I can copy this matrix successfully:

But when I set DFMT field of FMTFLAGS to 2, which means transpose, it hangs on function `DmaUtilsAutoInc3d_wait`:

am I wrong to set some fields of this TR? Please help to provide some ideas to solve this problem. Thanks.

over 2 years ago

0 haijun over 2 years ago

Intellectual 575 points

sorry, the matrix is of shape 8x8 in fact, and the numbers in the screen shot are all hexadecimal.

0 Brijesh Jadav over 2 years ago in reply to haijun

TI__Guru**** 499665 points

Hi haijun,

Are you sure that the transpose is supported? Can you please read capabilities register and confirm the same? As far as i recollect, this feature was supported only on DRU channels and that too got removed in the later version.

Regards,

Brijesh

0 haijun over 2 years ago in reply to Brijesh Jadav

Intellectual 575 points

Hello,

I checked NAVSS0_UDMASS_UDMAP0_CFG register as described in the above picture, its value is 0xB800F， just the same as the default value shown above. As the value indicates, type 2 TR is supported.

0 Brijesh Jadav over 2 years ago in reply to haijun

TI__Guru**** 499665 points

Hi,

Can you also readback CAP1 register at the offset? This is where DFMT field tells whether Transpose is supported.

Regards,

Brijesh

0 haijun over 2 years ago in reply to Brijesh Jadav

Intellectual 575 points

Hi,

I checked this and the value is 0x0. So it is not supported on TDA4VH. Thanks for your help.

+1 Brijesh Jadav over 2 years ago in reply to haijun

TI__Guru**** 499665 points

Yes, if it is set to 0, this feature is not supported on this device.

Regards,

Brijesh

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TDA4VH-Q1: DMA cannot work when DFMT is transpose