Other Parts Discussed in Thread: OMAP-L138
Hi, I am bringing up a new HW design with a PCM3070. The codec is coupled to an OMAP-L138 McASP and successfully streaming wav files with aplay, but still working on getting audio capture going.
The immediate question however is loopback. I am trying to validate some of the analog signal path, according to the PCM3070 Application Reference Guide SLAU332–March 2011
Page 0 / Register 29: Audio Interface Setting Register 3 - 0x00 / 0x1D - bit D5
enables "Audio Data in is routed to Audio Data out" . Looking at Figure 2-1. Analog Routing Diagram it appears that IN1 is the only input routed to HPL/HPR.
However with the HP stage and output active, with the loopback enabled and with audio being input to IN1, there is no audio out. Is this a simple analog path? Are there any other register settings I am missing? Does anything else need to be activated? ie: I2S clocks? If you could provide a register set example like in Chapter 4 Example Setups to enable loopback would be very much appreciated. Thanks in advance, Tom
