Software build & programming:

First, install bootloader using USBASP:
```
cd optiboot
make install
```

Second, program the main software.

Alphanumeric display version:
```
cd soft
make install PROGPORT=COM16 LCD=alnum
```

Graphical display version:
```
cd soft
make install PROGPORT=COM16 LCD=graphic
```

Warning: remember to ```make clean``` when switching between versions.

## PC test tool

`gps-test-tool` is a standalone PC program that reprocesses NMEA logs
through the actual embedded filtering and GPX-generation code, for
reviewing filter behavior and regression-testing the parser without
flashing a device. See [gps-test-tool/README.md](gps-test-tool/README.md).