Quickstart:
git clone https://github.com/bablokb/pico-st7735-demo.git
git submodule update --init --recursive
mkdir build
cd build
cmake ..
make
Note that both the toplevel CMakeLists.txt and the
library-level pico-st7735/CMakeLists.txt write variables
into the cache. Once written, they are kept until manually
deleted. This is to set default values in the lib-file
and override them on first run from the top-level file
(or the cmake commandline).