This isn't pretty at all, but it shows the principle.
Unfortunately it also exploits a bug in the I2C sending mechanism,
I2C sending hangs a few seconds after reset.
You see where the journey is going? This is the equivalent to the
function to write a character to the serial line, so we can
basically swap these two in other functions.
Monospaced fonts require a bit less space, right now it saves a
nice 110 bytes binary size.
Actually, the distinction between monospaced and proportional
fonts was in font.h already, so not supporting them was a bug.
But so far we have no monospaced font, so nobody noticed.
Note by Traumflug: this code was written by Ruslan Popov a lot
earlier already. I picked it to i2c_test.c to get "something"
visible running. This is the commit finally adjusted to the new
display infrastructure.
Markus Hitter
Ruslan Popov