MIDI-to-USB interface with a 5V Trinket. Based on TrinketMIDI.

Upload this to your Trinket, hook up the MIDI signal on pin PB2 and you're ready to go!

Detailed building instructions coming soon in the blog.

The Trinket doesn't have a UART, so it has to be emulated in software. For this, a special version of SoftwareSerial is used, that makes use of the INT0 interrupt to avoid conflict with V-USB.

Parts:

• main.cpp: Main program.
• SoftwareSerial.*: Library for serial RX (MIDI signal)
• usbdrv, usbconfig.h, trinketusb.*: Driver allowing Trinket to become a low-speed USB device
• vusbmidi.*: USB-MIDI specific descriptors, for the driver to use.

USB initialization and oscillator calibration methods in trinketusb.c are from Adafruit TrinketKeyboard library and licensed under LGPL v3

V-USB MIDI device descriptors and V-USB skeletop functions in vusbmidi.c are from Martin Homuth-Rosemann's V-USB MIDI project and licenced under GPL v2

Code from @jokkebk and me (@mild_sunrise) licenced under GPL v3 which should be compatible with both of the above. Enjoy!

EVERYTHING COMES AS-IS, USE AT YOUR OWN RESPONSIBILITY! See source and licence files for additional disclaimers.