通过学习直流电机实验，了解PWM波如何配置，来控制电机的转动。大家在学习时还是要在去熟悉下我们课本的事件管理器那一章，对其寄存器有个了解，好再去看程序，就都明白了.-Through the study of DC motor experiment, learn how to configure the PWM wave to control the motor rotation. Everyone still in the learning we want to become familiar