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README.md

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.