TMS320F280049: Data mismatch happen with some burst configurations using FSI with DMA

Aki Li

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/749786

Based on the above test, I found an strange problem.There is mismatch(error) for some received data with some data configuration for DMA.

The below is the result with “8 words per burst, 8 bursts per transfer” with 12.5MHz clock, so it is wrong from the 16th data.

And I changed the data of 64 words to “4 words per burst, 16 bursts per transfer”, it worked correctly.

Furthermore, it is the same case for the the original example project “fsi_ex3_loopback_dmacontrol”.

I have not figured out why it happened, and it is the same result with different clock frequencies. Could you help me with this issue? Thank you!

over 7 years ago

0 Manoj Santha Mohan over 7 years ago

TI__Guru 55700 points

Aki,

I will assign this thread to same engineer who worked in the previous post.

Regards,
Manoj

0 Aki Li over 7 years ago in reply to Manoj Santha Mohan

TI__Genius 10115 points

I have found out this issue is due to the wrong configuration for DMA.

The below nWords is incorrect, which should be replaced by the number of bursts to be transferred before a wrap, that is 16/ nWords.
DMA_configWrap(DMA_CH1_BASE, DMA_TRANSFER_SIZE_IN_BURSTS, 0, nWords, 0);

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049: Data mismatch happen with some burst configurations using FSI with DMA