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TMS320C6748: Having trouble getting mcaspPlakBk working on c6748 lcdk

Part Number: TMS320C6748

Hi

I just purchased a c6748 lcdk and am trying to get the mcasp example form the C6748_StarterWare_1_20_04_01\examples\lcdkC6748\mcasp working.

I have mic connected to line-in and monitor speaker connected to line-out

The program got stuck to the following loop

while(McASPTxStatusGet(SOC_MCASP_0_CTRL_REGS) & MCASP_TX_STAT_DATAREADY);

I am not sure what I was doing wrong since I have not changed any codes.

For experiment purposes, I did commented out of the line and got stuck at another while loop after failing the following condition

if(lastFullRxBuf != lastSentTxBuf)

It seemed that there is something wrong with the McAsp TX.

Can anyone help me on how to debug this issue?

Thanks

Frank