RPMidi

A Raspberry Pi Pico MIDI Player, written in MicroPython.

What is this, exactly?

This is a somewhat dysfunctional MIDI player for a Raspberry Pi Pico. TL;DR, it allows you to take MIDI files, and shove them down your Raspberry Pi Pico's GPIO pins as PWM signals.

Cool! How do I use it?

• Download the source code and extract it's contents onto your Raspberry Pi Pico. Make sure that it's running MicroPython first. I would recommend using Thonny.

• Download a MIDI file (No more than 4 voices)!

• Shove your MIDI file into this converter and add your song data in songs.py. Recommended default settings are .\miditones.exe -t=4 .\your-midi-here.mid

• See main.py for the rest!

GPIO defaults

GPIO Pins 6-9 are used by default.

• 6 -> Channel A0
• 7 -> Channel A1
• 8 -> Channel B0
• 9 -> Channel B1

Of course, since the Raspberry Pi Pico's pins are almost entirely PWM-friendly, you can remap this to whatever pins you want in rpmidi.py (as long as they are PWM supported, which should'nt be a problem).

Changelog

Version	Info
v1.1	Timing bug fix and code cleanliness fixes.
v1.0	Initial commit.

Known bugs

• If MIDI files have more than 4 voices, the MIDI timing will get borked.
• TODO: find more bugs

Credits

Thanks to LenShustek for providing the Miditones converter, evilwombat for the stm-bmc project (Mainly inspiration for the default music), and the Raspberry Pi Foundation for creating the Raspberry Pi Pico!