Directory structure

1. hardware contains schematic and printed circuit board layout of device hardware. These are created using KiCad.
2. hardware/production-files is the target for production files generated by KiCad. No files saved there are stored to source control.
3. src contains firmware source code
4. target contains compiled firmware and intermediate files. No files saved there are stored to source control.

Build system

You need to have avrdude installed to build.

1. Define avr model and programmed used by editing avr-config file.
2. If needed, configure fuses by editing fuses script and running it. Fuse values can be determined by using e.g. Engbedded fuse calculator. (Or, of course, simply by consulting the avr datasheet.)
3. Compile and upload firmware from src directory by running build script.

Note that depending on configuration, the port variable may need to be changed after connecting and disconnecting the programmer.