Testing version of Antonio Galea soft_pwm driver (https://github.com/ant9000/soft_pwm) to generate step pulses for Daisy-2 stepper motor module (http://www.acmesystems.it/DAISY-2)
2012.10.31: Added a new sysfs parameter pulses that controls the number of repeats; use -1 to go on forever, 0 to stop immediately
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