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- 用pwm控制 led的亮度 通过时钟分频,用PWM脉冲调宽来控制LED灯亮度的强弱,改变PWM的占空比来实现恒流LED的亮度强弱控制-By the clock frequency, pulse width modulated using PWM to control LED brightness light intensity, changes in PWM duty cycle to achieve constant current LED brightness intensity con