RTOS/EVMK2GX: Processor SDK: McASP driver multiple serialisers interleaved

FelixS

Part Number: EVMK2GX

Tool/software: TI-RTOS

Hello,

I'm working on a McASP project with multiple serialisers, each using one timeslot, which are to be saved interleaved (Mcasp_BufferFormat_MULTISER_1SLOT_SER_INTERLEAVED).

I noticed that with this setting, the McASP driver from Processor SDK RTOS 04.03.00.05 does not seem to work correctly. Instead of filling the whole buffer, only the data from one serialiser gets written.

I have traced this issue to mcasp_edma.c starting from line 1943 where *bIndex does not get set when the interleaved setting is chosen. This leads to the DMA not incrementing the destination address and therefore overwriting the sample data.

From my understanding of the interleaved buffer principle, the fix should be to insert

*bIndex = (int16_t)(*aCnt);

Can you confirm that this is a bug and not a wrong setting on my side and that this fix is correct?

Thanks in advance,

Felix

over 7 years ago

0 Cvetolin Shulev-XID over 7 years ago

TI__Guru 65405 points

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

BR
Tsvetolin Shulev

0 Rahul Prabhu over 7 years ago

TI__Guru** 116840 points

Felix,

HAve you checked the interpretation of MCASL LLD buffer formats that we provide here:
processors.wiki.ti.com/.../Processor_SDK_RTOS_MCASP

does this not match your expected data format in the buffer? The format is being used in multiple McASP examples so I doubt that there is a bug in the settings. Have you checked to see if the examples are also showing the same behavior. How many TX /RX serializer are you using. Are you using TI EVM or custom board.

Regards,
Rahul

0 FelixS over 7 years ago in reply to Rahul Prabhu

Prodigy 70 points

Rahul,

thanks for your reply.

Yes, I have checked the interpretation of the different buffer formats in the documentation and it does not match the observed behaviour with the driver.

I am using 4 serialisers on the TI EVMK2GX in my project but I was able to reproduce the problem using the MCASP_DeviceLoopback Example while defining DSP_MODE so that the mentioned BufferFormat is being used.

Kind Regards,

Felix

0 dzhou over 6 years ago in reply to FelixS

TI__Genius 9065 points

Felix,

Just to follow up on this old E2E thread, in your implementation do you still need to use the setting you described earlier?

best regards,

David Zhou

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RTOS/EVMK2GX: Processor SDK: McASP driver multiple serialisers interleaved