Instructables

Portable native MOD player based on Raspberry PI (plays MOD,S3M,IT,XM etc...). Uses BassPlay library.

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Step 8: Testing part

 Please put some mod,s3m,it,xm files in the directory /files/music

You can either reboot to test auto-start or run manually for testing purposes:

/etc/init.d/player_control.sh

You should be able to use buttons next/previous to switch the songs.
Also you should be able to stop song and start again by start/stop buttons.

Troubleshooting tips:

If the bassplay itself can play modules, please check the functionality of GPIO wiring.

You can test state of pins by  /usr/bin/gpin.sh

This scripts returns value of pin defined by the parameter.
You can press particular button ant test whether 1 changes in 0 and vice versa.