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- PWM蜂鸣器驱动实例,产生频率为25Hz,占空比为50 的蜂鸣器发声信号;同时详细介绍USB下载线的连接与驱动安装,进行板级的代码在线调试和固化-PWM buzzer driver instance, the frequency of 25Hz, duty cycle of 50 of the buzzer sound signal at the same time the USB download line connection and driver installation, the b