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Forum Index : Microcontroller and PC projects : CMM2 Question: ADC on PLAY SOUND output?

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RetroJoe

Senior Member

Joined: 06/08/2020
Location: Canada
Posts: 290
Posted: 03:12pm 30 Mar 2021
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Is there a way to digitize the output of the PLAY SOUND command using the ADC command?

E.g. is the L & R output voltage of the PLAY SOUND  command available on the I/O pins so they can be looped back for reading with the ADC command? Maybe there is a way to perform the loopback in software?

In either case, would this operation be "non-blocking" l.e.will the ADC command work properly while PLAY SOUND is running?

The use case is to create a little oscilloscope display of the audio waveform that is playing. Any guidance would be appreciated!
Enjoy Every Sandwich / Joe P.
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10597
Posted: 05:19pm 30 Mar 2021
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  Quote  Is there a way to digitize the output of the PLAY SOUND command using the ADC command?

E.g. is the L & R output voltage of the PLAY SOUND  command available on the I/O pins so they can be looped back for reading with the ADC command? Maybe there is a way to perform the loopback in software?

In either case, would this operation be "non-blocking" l.e.will the ADC command work properly while PLAY SOUND is running?

The use case is to create a little oscilloscope display of the audio waveform that is playing. Any guidance would be appreciated!


Like this?

The code is  on TBS here
Edited 2021-03-31 03:27 by matherp
 
RetroJoe

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Joined: 06/08/2020
Location: Canada
Posts: 290
Posted: 05:39pm 30 Mar 2021
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Peter, thanks - almost like that, but simpler (basic waveforms via PLAY SOUND instead of MP3 playback, and a time series display instead of frequency domain).

But, yeah, pretty much the desired effect - the FFT will be a nice "flourish" :)
Enjoy Every Sandwich / Joe P.
 
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