makerbot/G3Firmware — pull request #80 by giseburt (2011-10-08 18:13:54+00:00)
Title: ECv22 can run a fan off the second h-bridge.

I remapped the fan commands to the second (unused) h-bridge, instead of just saying "it can't be done." :-)

This also honors the "swap motor controllers" EEPRM flag.

Note: Electrically, I feel that the ABP motor should really be drive by the h-bridge, and the fan should be on the Channel C mosfet, but to avoid additional confusion when compared to the Gen4 setup, the way this code does it is probably best.