Hi all, my name is Jose Pereira, and i'm very interested in helping you with some code! I've wrote the buzzer driver for calypso, not so sure if will help you of anything, but was just for experimenting :) Anyway, i send the patch in attachement. The interface can be simply #include <calypso/buzzer.h> buzzer_mode_pwt(1); buzzer_volume(40); buzzer_note(NOTE(NOTE_E,OCTAVE_5)); Please let me know what do you think of the code, and in what way i can further help. Best regards, -- José Pereira http://onaips.blogspot.com