Counter Board Interface

[thinkl33t]

This controls the counter board, which is the front panel display:

Should be simple enough, cloning the two board connectors on the mainboard

J301-1 <- X, Y and Z step and direction are available at 3V3 on the step / direction pins on the smoothie board - might need level shifting
J301-1 <- counter reset XY / Z - linked to pins on the smoothie, hooked into G92 for resetting the counter
J301-1 -> FV Out - See issue #1
J301-1 <- Stop, !RESET - stop inhibits the counters, reset allows the board to be disabled entirely
J301-1 -- +5V, GND, +12v - to relevant pins
J301-1 <- ERROR LED - to IO pin

J301-2 -> Emergency Switch - smoothie reset pin
J301-2 -> Off Scale - one of X, Y or Z is off scale. Turn off display board by holding !reset high?
J302-2 -> VS LED 1..4 4 bit interface, feed rate in mm/second, goes up in 2mm increments.