CCS/TMS570LC4357: SCI Rx Count Using DMA

Shivam Kakad

Tool/software: Code Composer Studio

Hi,

I have set up the SCI3 Rx with DMA, where i am receiving the data correclty.

But, now i need to check the number of frames received after the transmission and want to clear it, so how can i do that.

I want to monitor the dma transfer count and accordingly the data received.

I tried by reading the CFTCOUNT but it is showing the fixed value(which is 0x1F980000) irrespective of the frame size.

There is a need to check this count and clear the respective bit for starting the counting again for the new coming data.

How can i achieve this?

Can anyone please help me out in this.

Regards,

Shivam Kakad

over 6 years ago

0 QJ Wang over 6 years ago

TI__Guru**** 200256 points

Hello Shivam,

CTCOUNT register is only updated after a channel is arbitrated out of the priority queue, other the value returned is not the current element transfer count.

You can use DMA interrupts to check the transfer ststus: FTC (frame transfer complete), HBC(first half of block complete), etc.

0 Shivam Kakad over 6 years ago in reply to QJ Wang

Expert 1355 points

Hi Wang,

Is there any approach to get the dma count, while the data tranmission or reception since i am not using priority queue.

As i could not enable the interrupts as per the application requirement.

Regards,

Shivam Kakad

0 Shivam Kakad over 6 years ago in reply to Shivam Kakad

Expert 1355 points

Can anyone help me in this.

Regards,

Shivam Kakad

0 QJ Wang over 6 years ago in reply to Shivam Kakad

TI__Guru**** 200256 points

Hi Shiva,

No. You can read the counter, but it is useless since it doesn't reflect the current value of the counter.

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CCS/TMS570LC4357: SCI Rx Count Using DMA