At the moment displayio makes many assumptions on the format of the display controller commands, limiting the controllers it can support.

In my particular case I tried to create a driver for the Waveshare 1.54inch e-Paper V2 display (datasheet). While the display has a 200x200 pixels resolution, the row addressing commands (0x45 and 0x4F) use a two byte, LSB first, parameter for the row. Function displayio_display_core_set_region_to_update() (at displayio_core.c) assumes a one byte parameter for self->ram_height less than 256 and a two byte (MSB first) parameter for self->ram_height greater than 255.

To support this controller there is a need of a more flexible way to specify the format of row addressing commands (or a way to override this in the python code, which would probably have performance issues).