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#ifndef _STEPPER_H_
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#define _STEPPER_H_
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#define S_STEP    PD6
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#define S_DIR     PD7
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#define S_MS      PB7
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//define the type func as a pointer to a void function with no parameters
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typedef void (*func)();
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/*returns a funciton pointer that must be called at regular intervals
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* as specified by the call_us argument
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*/
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func step_init(unsigned int call_us);
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void step_dir(int dir);
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void step_halfstep();
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void step_fullstep();
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void step_flush();
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void step_sweep_speed(unsigned int speed);
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void step_sweep_bounds(int ccw, int cw);
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void step_sweep();
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#endif