Converts an RTTL ringtone into verilog using Python - and plays it back using differential PWM modulation
Provide 10kHz 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, different tunes can be selected by different tune_sel inputs
# | Input | Output |
---|---|---|
0 | clock | piezo_speaker_p |
1 | reset | piezo_speaker_n |
2 | tune_sel0 | ledout_0 |
3 | tune_sel1 | ledout_1 |
4 | none | ledout_2 |
5 | none | ledout_3 |
6 | none | none |
7 | none | none |