linguini1 opened a new pull request, #3633:
URL: https://github.com/apache/nuttx-apps/pull/3633
## Summary
This commit fixes the audio_rtttl example (which was undocumented and
previously used kernel-level functions) such that now it uses the RTTTL parsing
library. Contributors can implement 'players' for different types of audio
sinks. Currently, PWM is supported.
## Impact
Can play RTTL with different devices! PWM supported for now, which a lot of
small boards have.
## Testing
Tested on the Rpi4B PWM-enabled audio jack. I confirm I heard the scale. I
also
tested with the Simpson's example from the RTTL library and it worked.
```
NuttShell (NSH) NuttX-13.0.0-RC2
nsh> audio_rttl /dev/pwm1
nsh>
```
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