AVR单片机ATmega16控制步进电机程序，发送字符A\B\C\D\E可以控制步进电机的正传、反转、加速、减速、停止-AVR Microcontroller ATmega16 stepper motor control program, sending characters A \ B \ C \ D \ E can control the stepper motor Cinema, reversal, acceleration, deceleration, and stop