USB MIDI Wheel is designed to act as an accessory device for SDR Console (https://www.sdr-radio.com/). The main purpose is to adjust VFO Frequency with an encoder-based wheel.
The hardware platform used are ATmega32U4 based µC boards, like the Arduino Micro. Other similar boards like e.g. the Adafruit Feather 32U4 could be used, however GPIO configuration may be adapted.
For pin mapping see source code.
The software is a "native" application, means it works without the Arduino software framework. Thus, the Atmel DFU Bootloader is in use instead of the Arduino bootloader. USB functionality is handled by LUFA library by Dean Camera (https://www.lufa-lib.org).
- Build project with Atmel Studio 7.0
- Get the megaAVR DFU USB Bootloader from the Microchip website https://ww1.microchip.com/downloads/en/DeviceDoc/megaUSB_DFU_Bootloaders.zip
- Connect (ISP) programmer to the board
- Erase chip
- Flash bootloader hex file
- Clear the BOOTRST fuse
- Flash application binaries using the DFU bootloader
The bootloader is started when the µC is being reset via the reset button.