基于Cortex-M3以及步进电机驱动器BA6845的两相步进电机驱动。采用中断方式控制加减速曲线，若想更改曲线数值，可在程序中直接修改生成公式-Cortex-M3-based stepper motor driver BA6845 and two-phase stepper motor driver. Control the acceleration and deceleration using interrupted curve, if you want to change curve values ​ ​ can be modified directly in the program generates the formula