epd2in7b-u Modified driver for Waveshare 2.7" e-Paper HAT (B) with support for windowed and b/w differential refresh. Resources https://www.waveshare.com/w/upload/d/d8/2.7inch-e-paper-b-specification.pdf https://benkrasnow.blogspot.com/2017/10/fast-partial-refresh-on-42-e-paper.html https://github.com/waveshare/e-Paper https://github.com/elad661/rpi_epd2in7