July 10, 2015 at 7:18 pm #22220
I’ve split off this discussion since it was not relevant to the one that it was attached to.
Try adjusting the speed of the clock to 8 MHz. The original makefile for the project uses a “-U lfuse:w:0xE2:m” argument, which sets the internal clock to 8 MHz. You do not need an external crystal.