CCS/TMS320C6748: Multichannel input using EDMA3

Part Number: TMS320C6748

Hi team,

The customer has a full array microphone projects that use tmsc3206748 ,2 aic3106 and 4 microphones .
Every two microphones are connected to aic3106, The i2s data is passed through axr12 and axr14 to tmsc6748. The both 3106 work fine.
C6748 prvide mclk,bclk and frame clock to 2 codecs. The customer  use EDMA to receive data on the bus.
If active one 3106, 6748 can receive data from microphone. But when  activate two 3106  at the same time, C6748 can no longer receive any interrupt.
The rovrn bit in RSTAT register set to 1, please help to analyze.

Hi,

Which Processor SDK RTOS version are you using?

Best Regards,
Yordan

I don't use rtos to config mcasp and EDMA module.All the code is based on starterWare .
It works fine when I active one 3106 to conected 2 mics.I think i some mistakes when configuring a C6748 McASP + DMA multi-channel output.

I did not checked that examples,thanks.

Thanks，What you said was right.
I changed edma configuration like this：
struct EDMA3CCPaRAMEntry const rxDefaultPar =
{
(unsigned int)(EDMA3CC_OPT_SAM | OPT_FIFO_WIDTH), // Opt
(unsigned int)SOC_MCASP_0_DATA_REGS, // src addr
(unsigned short)(BYTES_PER_SAMPLE*2), // aCnt
(unsigned short)(1), // bCnt
(unsigned int)rxBuf0, // dest addr
(short) (0), // bIdx
(short)(BYTES_PER_SAMPLE), // bIdx
(unsigned short)(PAR_RX_START * SIZE_PARAMSET), // LINK paRAM
(unsigned short)(0), // bCnt reload
(short)(0), // cIdx
(short)(0), // cIdx
(unsigned short)1 // cCnt
};

I change " (unsigned short)(BYTES_PER_SAMPLE*2), // aCnt to
(unsigned short)(BYTES_PER_SAMPLE*4), // aCnt "
Now I can receive data from mic.