Pulsed Audio

[tannewt]

Add ability to playback audio through a PWM output. That will allow us to playback audio on pins that don't have a DAC. An RC filter can be added to smooth it out.

[jepler]

@tannewt this is implemented on nrf now, and infrastructure is committed that would help a future implementation for atmel_samd. Do you want to hold this issue open?

[tannewt]

Nope, let's close this. We can always open a new issue when we want it for samd. Thanks 🎉