I got one of [these guys](http://ladyada.net/make/mshield/index.html) in the mail a while back. I'm building a small 2-axis CNC machine and one of my old stepper drivers just burned out (I think). So I thought this thing would be usefull since the ICs are in DIP.
The thing is I need to figure out which pins are the Step and Direction pins. The Arduino and Reprap IRC channels don't seem to have any answers. All information available seems to be about using the Arduino environment and whatnot. I'm not doing that. I flashed the Arduino with the Teacup Reprap firmware to interpret the G code and send it to the microcontroller. It looks like Adafruit didn't exactly intend for people to do this. They just have this library to be used with the Arduino environment. That looks like it's useful for pretty much everything BUT a CNC machine. All I need to know is which pins are being used for Step and Direction.
With the Easy Drivers, I could set that myself in Teacup's config.h file. But since this shield is fixed to use certain pins, I can't do that.
The first thing that comes to mind is trying every combination of pins for Step and Direction for the X and Y axes, but that requires editing the config file, re-flashing the Arduino, and then running some code in Pronterface to see if the motors move. Seems kind of tedious.
It would be awesome if someone out there knew how to figure this out.