All in one chunk because the infrastructure is already there.
This also implements the parallel 4-bit bus used by quite some
displays.
For now you have to add quite a number of #defines to your
config.h. First, there are all the pins required, pin names
changed to your actual board/display connection, of course:
#define DISPLAY_RS_PIN PC1
#define DISPLAY_RW_PIN PC0
#define DISPLAY_E_PIN PD2
#define DISPLAY_D4_PIN PD3
#define DISPLAY_D5_PIN PD4
#define DISPLAY_D6_PIN PD5
#define DISPLAY_D7_PIN PD6
And then the information about the display actually existing:
#define DISPLAY_BUS_4BIT
#define DISPLAY_TYPE_HD44780
Allowing to do all this in Configtool is forthcoming, of course.
Yes, these strategies feel a lot like heading into uncharted
territory, because I can't find notable textbook examples on how
to select between various "classes" at compile time. Nevertheless,
it works fine, binaries are small and fast and as such it can't
be _that_ wrong.
Markus Hitter