What is it:
This program is a simple test for testing the audio device on a linux host.
The application, testfreq, will test the audio device by playing a sine wave
at A440 and then sampling the input for that frequency - input is coupled to
output with a cable.

To build:

first install libasound2-dev and libfftw3-dev

then run make

make clean will tidy up

To run the test:

use a cable to connect the input jack to the output jack (line out to mic in)

adjust mixer settings for your device

run with:  ./e2eaudiotest.sh