petercwallis
commented
2 years ago Hmm. My java background was showing: I was trying to find hello_analog_microphone.c - it is (I assume) analog_microphone example and called "main.c"
"cafe xxxx" seems to be right - the 4010 changes so that the host machine doesn't use the cashed driver.
Still can't get it to work - changed hardware. Now trying to find where the adc is read in the code...
The structure of the examples could be better or could do with more explanation.
I believe I have followed the instructions for the analog mic and then installed the usb example. I could not find the hello_analog_microphone example source to see what it is meant to do. After building and transferring the uf2 file for usb_microphone, unpluging it, and plugging it into the pi4 on my desk in place of the commercial usb mic, it appears under lsusb as "cafe 4010" but when I record a wav file with arecord, I hear (using aplay) a click, but nothing else. I have grepped the code for "cafe" and "4010" to no effect but expect the code is designed to give a slightly more informative usb device description?
issue 1) where is hello_analog_micrphone source and what is it meant to do? I am guessing it tests the mic without going via usb. 2) what should we expect from lsusb? 3) and (of course) it doesn't work as expected on the pi 4!