Bus error

[Niek0z]

Code generates a bus error when the GPIO's are not exported via /sys/class/gpio.
I did'nt do in depth research but I've heard it might be a clock issue.

BTW,
This is a exelent library for the HD44870 displays. I had some stability issues in my own code.
4-bit interface is tested and works a treat!

[piranha32]

This is an issue with GPIO modules not being enabled by default. Exporting pins from /sys ensures that the module is enabled and there should no problems using it. I tried to find out if it is possible to enable GPIO from device tree, but at that time I could not do it.
Accessing HW module which has not been enabled will cause BUS error.