Running the software

Compiling and Flashing

An AVR-GCC Makefile is provided to compile and flash the software.

$ make
$ make flash

You may need to change the PROGRAMMER = usbasp line in src/Makefile to the AVRDUDE name for your programmer.

Serial Output

Connect a FTDI Serial-USB cable to see the serial output. You can use whatever serial terminal you prefer — the Linux command screen and Python’s pySerial miniterm console are two options.


--- Available ports:
---  1: /dev/ttyUSB0         FT232R USB UART
--- Enter port index or full name: 1
--- Miniterm on /dev/ttyUSB0  9600,8,N,1 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
[-- rotenc --]

The characters + and - are displayed as the rotary encoder is rotated clockwise and counterclockwise, respectively.