Converts an RTTL ringtone into verilog and plays it back using differential PWM modulation.
Provide 12kHz clock on io_in[0], briefly hit reset io_in[1] (L->H->L) and io_out[1:0] will play a differential sound wave over piezo speaker (Bad Apple)
# | Input | Output |
---|---|---|
0 | clock | piezo_speaker_p |
1 | reset | piezo_speaker_n |
2 | none | none |
3 | none | none |
4 | none | none |
5 | none | none |
6 | none | none |
7 | none | none |