TMS320C6657: Question about C6657 MCBSP EDMA QNum issue.

Denny%20Yang99373

Expert 3805 points

Part Number: TMS320C6657

Hi all,

My customer is debugging C6657 MCBSP EDMA.

When edma init, he set 36/37/38/39 event to Q0/1/2/3. But Q0 and Q3 not working.

So customer set 36/37 to Q1 and 38/39 to Q2, it can work.

Customer want to know the reason? And how to check who used the Q0 and Q3.

Customer change code:

gpEDMA_CC2_regs->TPCC_DMAQNUM[4]= 0x32103210;

gpEDMA_CC2_regs->TPCC_DMAQNUM[4]= 0x22113210;

BR,
Denny

over 5 years ago

0 Yordan Kovachev over 5 years ago

TI__Guru**** 161600 points

Hi,

Which Processor SDK RTOS version are you using?

Best Regards,
Yordan

0 Denny%20Yang99373 over 5 years ago in reply to Yordan Kovachev

TI__Expert 3805 points

Hi Yordan,

Customer don't use RTOS, they used they own bare-metal software.

Please help this from hardware aspect, Are there any limited for EDMA usage?
thanks!

BR,
Denny

0 Mukul Bhatnagar over 5 years ago

TI__Guru* 82605 points

Denny

There is one to one mapping on Q to TC , Q0 to TC0 , Q1 to TC1 etc.

TC0 and TC3 are not connected to McBSP

0 lding over 5 years ago in reply to Mukul Bhatnagar

TI__Guru* 95265 points

Denny,

I thought this is answered by Mukul already. Also, the C6657 only has one EDMA CC, it has four TCs. I saw the code used "gpEDMA_CC2_regs->TPCC_DMAQNUM[4]". Please make sure that gpEDMA_CC2_regs points to EDMA base address 0x2740000.

Regards, Eric

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TMS320C6657: Question about C6657 MCBSP EDMA QNum issue.