CCS/TMS320C6748: FIR Filter on mcasp staterware (how to filter rxBuf values)

Part Number:TMS320C6748

Tool/software: Code Composer Studio

Hello,

I am trying to implement a FIR filter on the LCDK6748 starterware McASP. I've browsed every topic possible for 3 months on the e2e forum and I still cant manage to implement a bandpass filter onto the McAspPlayBk.c. I've read in some topic that it's because of the I2S protocol?

I understand the rxBufPtr takes both right and left channels at once, and the original memcpy() function copies directly its value to txBufPtr.

I've tried every bit of solution or help I could find here and still can't manage to filter anything out...

I've tried copying the rxBufPtr[lastFullRxBuf] to a local bufer, then FIR Filter it, the copying it the result (another buffer) to the txBufPtr[lastSentTxBuf], it compiles but all I hear is noise.

I'm missing out on something, to add that to my lack of skills in programming/implementing, so any help is very welcome :)

thanks in advance,

Loane

PS: the mcAsp itself works just fine