TDA4VM: Mcasp: How to use uo-dma mode?

eason zhou

Part Number: TDA4VM

Tool/software:

HI Ti expert

SDK: 0902 & 0806

In the current mcasp demo, DMA+interrupt is used to transmit or receive data. Is there a way to use interrupt+polling? Is there a related demo?

Best Regards
Eason

2 months ago

0 Jared McArthur 2 months ago

TI__Genius 17905 points

Hi Eason,

What do you mean by interrupt+polling? They are mutually exclusive.

Best,
Jared

0 eason zhou 2 months ago in reply to Jared McArthur

Intellectual 835 points

Hi Jared

Jared McArthur said:
What do you mean by interrupt+polling? They are mutually exclusive.

Sorry, I expressed it wrong. I want to know if there is a way that does not require interrupts and DMA, I want to use polling.

Best Regards
Eason

0 Jared McArthur 2 months ago in reply to eason zhou

TI__Genius 17905 points

Hi Eason,

Can you send a link to the demo you are referring to?

Best,
Jared

0 eason zhou 2 months ago in reply to Jared McArthur

Intellectual 835 points

Hi Jared

Jared McArthur said:
Can you send a link to the demo you are referring to?

pdk_jacinto_08_06_00_31/packages/ti/drv/mcasp/example/src/audioSample_main.c

Best Regards
Eason

0 Jared McArthur 2 months ago in reply to eason zhou

TI__Genius 17905 points

Hi Eason,

Let me look into the pdk code. There may be a setting within the dmautils that selects between interrupts and polling.

Best,
Jared

0 eason zhou 2 months ago in reply to Jared McArthur

Intellectual 835 points

Hi Jared

Jared McArthur said:
Let me look into the pdk code. There may be a setting within the dmautils that selects between interrupts and polling.

Any Update on this ?

Best Regards
Eason

+1 Jared McArthur 2 months ago in reply to eason zhou

TI__Genius 17905 points

Hi Eason,

You may be able to change the eventMode for the MCASP DMAs in mcasp_dma.c

Is there a reason you prefer using polling over interrupts?

Best,
Jared

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TDA4VM: Mcasp: How to use uo-dma mode?