Endstop Trigger FIX

[A-Makuba]

Change triggering of the endstop by the front.
It is necessary when the endstop are normally closed, to the rising edge.

Also compatibility with the falling front is maintained.

[ChristianRinn]

Hello Alexander,
I tried this with one of the "standard" reprap-like switches, i.e. pull-up connected to COM and NO connected to GND. The problem is that after you hit the endstop you have to unlock the device twice because it will trigger the endstop interrupt on both edges.