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Running PCM Data into McBSP

Other Parts Discussed in Thread: AM3517

Hello,

We are trying to connect to a cellular modem with McBSP2 on a AM3517.  The interface is:

16-bit linear PCM data

MSB first

Modem is master

We have the waveforms looking pretty good.  We can play audio, but with recording we just get silence, not even any noise in the data.  Appreciate any suggestions, but a question to start:

Does the SRG need to be active if the McBSP is in slave mode?

Thanks,

Cliff