hiduino | : musical_keyboard : Native USB-MIDI on the Arduino

The Github wiki contains a host of information on working with HIDUINO. HIDUINO can be flashed onto the ATmega (8u2/16u2) chip on the UNO and Mega2560. Sketches cannot be bootloaded onto an Arduino while a HIDUINO firmware is loaded on the 8u2, so users can expect to switch between the default usbserial and HIDUINO firmwares regularly during development. The flashing process can be accomplished using an ISP (recommended) or through the DFU bootloader. If using the ISP method, an easier way of development is to flash the USB controller chip with HIDUINO just once. Then, in the Arduino IDE, select "Upload Using Programmer" and connect the ISP to the header block near the main chip. This means the Arduino sketch can be flashed from the IDE without commandline interaction via an ISP or DFU. While HIDUINO is loaded onto the USB controller, do not attempt Serial communication via Serial.print()/println(): this will interrupt MIDI serial stream on the USB controller. Flashing the arduino_midi firmware located in the compiled_firmwares directory: Note Remove the slashes in a program like Notepad if you are on Windows. The latest revisions (3+) of the Mega and UNO (and Due) use the Atmega 16u2 chip, so note the name changes of the default usbserial firmware below. On older revisions, the 8u2 chip is used. 8u2 firmwares are also included in the Compiled Firmware directory. The only important distinction between them is the product string that appears when an Arduino connects to a computer. avrdude will give a generic error if you try to flash an 8u2 chip with a 16u2 firmware and vice-versa. The at90usb82 chip profile is used for the following commands as it resembles both 16u2 and 8u2 -- one less thing to remember to change.