Hi,

I just started with the e-paper and I run into behaviour of it that I cant explain, maybe you can help me. (gray model)

I works perfectly predictable in normal update mode (7s one) but when set to the delta mode it seems like the color constants are no longer valid  and  fill display white does fill it with black instead.

ep = BrickletEPaper296x128(epaper_uid, ipcon)
ep.set_display_type(1)
ep.set_update_mode(0)
 
ep.fill_display(ep.COLOR_WHITE)
ep.draw_text(16, 48, ep.FONT_24X32, ep.COLOR_BLACK, ep.ORIENTATION_HORIZONTAL,clock.strftime("%H:%M:%S"))
ep.draw()
time.sleep(10)
    
ep.set_update_mode(2)
ep.fill_display(ep.COLOR_WHITE)
clock = datetime.datetime.now()
ep.draw_text(16, 48, ep.FONT_24X32, ep.COLOR_BLACK, ep.ORIENTATION_HORIZONTAL,clock.strftime("%H:%M:%S"))
ep.draw()

my logic is that I before  calling the second draw I fill the buffer with white, draw next clock and then call draw to dispay and the text should update.

Unfortuantely the above causes the screen to go all  black why?

Indeed, the fill_display function did not yet have support for delta mode. I just released firmware version 2.0.2 that adds support for it.