用于开源单片机开发平台的步进电机库文件，基于C++语言，可设置速度和加速度，支持多个电机并发运行，可直接输出4线步进电机或两线驱动器（如AFMotor和EasyDriver）控制信号，4拍8拍可选，API函数不需要延时。-AccelStepper significantly improves on the standard Arduino Stepper library in several ways: Supports acceleration and deceleration

ASM example from https://lujji.github.io/blog/