Include pico_tone library

[jcarranz97]

Fixes #1568

This PR includes tone functions to generate tones using PWM.

The tone function is similar to tone() from Arduino. I have also included a no_tone function to silence buzzer if needed.

I have a PR open in pico-examples repository which includes an example usage for this library.

• Add tone generation example using PWM and piezo buzzer or a speaker pico-examples#444

Inspiration and References:

• [docs.arduino.cc] - Play a Melody using the tone() function
• [www.hackster.io] - PWM Sound Synthesis
• [peppe8o.com] - Passive Buzzer with Raspberry PI Pico and MicroPython

[lurch]

This might be better suited to https://github.com/raspberrypi/pico-extras than it is to pico-sdk ?

[jcarranz97]

That is probably the best approach ...

Is the normal process first propose new libraries and examples against pico-extrasand pico-playground?
If that is case, I can go ahead an move my PRs to those repos 👀

[lurch]

I believe the way it normally works is that if your example works out-of-the-box with the develop version of pico-sdk then you'd just submit it against pico-examples; but if your example relies on pico-extras then you'd submit it against pico-playground.

So in answer to your question: yes 😃

[jcarranz97]

Thanks for the advice, I have just opened a PR against pico-extras to include this library there 💪
raspberrypi/pico-extras#70

[peterharperuk]

Not an sdk issue