Starting with the USB audio example, I removed the USB headphone device to just have the microphone. The sof events for the microphone were piggy backing off the headphone events so with the headphone removed, the microphone needed an sof interrupt handler registered. Also, I changed the channels to one and the mic terminal channel config to only the left front. I have software that outputs a nice sounding sine wave at 1 KHz with the example’s 48000 Hz sapling rate. However, when I change the sampling rate to use any of the other standardized frequencies that are supported, the audio has severe artifacting. I would think it should work fine with the change being the pitch of the generated sine wave. Are there other changes required other than the frequency specified in the microphone audio format description that I am missing? The only standard sampling rate that seems to work without an issue is the 48 KHz.
