This solution is more flexible than the Timer pattern, as it goes full speed if the user doesn't do anything but doesn't keep the machine from being responsive otherwise.

这个解决方案比计时器解决方案灵活，因为如果用户不做任何事情，它会全速运行，同时不会影响计算机的响应性。

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Based on this method, the accurate control pulses are generated from the PC timer and used for driving the step motor to realize a wide range speed control smoothly.

基于该方案，通过截用PC机系统的定时器资源产生精确定时的控制脉冲，使步进电机实现宽广范围内的速度平滑控制。

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The system software involves five main modules: initialization module, phase-changing module, current-regulating module, speed-regulating module and timer interrupt module.

软件分为五块：主程序中的初始化模块、换相子程序模块、电流调节、速度调节子程序模块，定时器中断程序模块。

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