I just wrote some code for the MSP430F2011/2/3 to control two H-bridges connected to a bipolar stepper motor. Available in git form here:
git clone http://users.ecs.soton.ac.uk/rds204/git/stepper-driver.git
Takes a STEP and a DIRECTION signal – ready for connecting to a parallel port for use with EMC.
As for what it’s driving – it’s amazing. More on that later!
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