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Stepper motor signals
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This is a capture of Smoothieware stepper signals while running the test.gcode.

Signals:

0: ARM ITM trace (irrelevant)
3: Y axis step
4: Y axis direction
5: X axis step
6: X axis direction

Command to decode X axis position:
sigrok-cli -i smoothieware.sr -P stepper_motor:step=5:dir=6:unit=mm:steps_per_mm=80.0
(though steps_per_mm doesn't currently work in sigrok-cli)