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Clock fail error in McASP

Other Parts Discussed in Thread: OMAP-L137

Dear TI,

I have changed the McASPEcho program here for my OMAP-L137. 

There in that example the McASP is used. 

I am recieving an error XUNDRN in XSTAT and both ROVRN  and RCKFAIL  on RSTAT.

And the followinig operation is performed:

mcaspRegs->XBUF11 = (Uint32) mcaspRegs->RBUF12;

but no sound is heard. 

Why does the RCKFAIL happens and how to fix it?