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最近一个项目需要做四路PWM的波型输出，可是看了一下协议栈，发现定时器的驱动需要自己来写，感觉好有难度。除了这个方法外，再就是自己定义函数写PWM的函数，然后直接在蓝牙栈里面调用，不过这个好像不是特别好，毕竟是做项目。
