Introduction - If you have any usage issues, please Google them yourself
Functional requirements: (1) start to 1 , the stepper motor rotation. start for the 0 when the stepper motor to stop. (2) default step_in is a constant, when clk for the rising edge, load and start to 1 load, the motor started to rotate, turning step_in times, stop turning. When the next in line with this request will be turning again. (3) through the load,, step_in synchronous or asynchronous loading steps value.