文件名称:PWM
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内容：1、利用定时器产生PWM，了解原理和使用方法
2、硬件要求：LED灯 定时器
3、试验现象：LED灯由亮到灭，由灭到亮逐步变化，也就是调光现象-: 1, using the timer generates PWM, understand the principle and the use of method 2, the hardware requirements: LED light timer 3, the test phenomenon: LED light from bright to off, the light gradually changes from the off, dimming phenomenon is
2、硬件要求：LED灯 定时器
3、试验现象：LED灯由亮到灭，由灭到亮逐步变化，也就是调光现象-: 1, using the timer generates PWM, understand the principle and the use of method 2, the hardware requirements: LED light timer 3, the test phenomenon: LED light from bright to off, the light gradually changes from the off, dimming phenomenon is
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PWM.c
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