I'm connecting a USB audio device that outputs I2S (the Texas Instruments PCM2707C) to the ADAU1701 (the evaluation board). I have a simple SigmaStudio project that routes directly. I connect my headphones, and sound is there.
However, when I unplug the USB cable from the USBi and power the ADAU1701 board with a 5V power supply (through connector J2), sound goes away. I have written the compiled binary to E2PROM, and in fact, it does work even if I do not have SigmaStudio open.
The LED (I guess D3) does light up when I plug the power supply to J2.
Anything else I need to do? Unplug the header that comes from the USBi? Jumpers J3, J1?