Endless move

Hi @markol. Thanks for you to make it available this project for us. I already builded the mechanic construction, i use arduino Uno with GRBL shield v3.0 and A4988 modules, 1/16 usteps. I use Z and A(pin13 and 12) axis, because X and Y use the INT pins on the shield, for the endstop(MIN) switch i use Z-(11) and Y-(10). My problem is when i try to Home axes(G28) , then not stop when reach the endstop, it moves in one direction continuously until i press hardware reset.The same situation when e.g. give command G0 X1 Y0 F1000. For command M119 switches open i get X0 Y0 or for switches close X1 Y1. I tried just the bare mechanics without encoder from motor or shaft encoder. This is a problem or need to work without these sensors? First i just want to try the XY movements. Thanks and i hope i opened an issue for the correct project(i think its a firmware/user issue), György