【NUCLEO-F767ZI】用PWM控制LED亮度
<font face="Tahoma, Helvetica, SimSun, sans-serif">在MicroPython中用PWM控制LED的亮度，需要使用Timer和Pin两个模块</font><br /><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">from pyb import Pin, Timer</font><br />
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<font face="Tahoma, Helvetica, SimSun, sans-serif"># led1使用TIM1_CH2</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">tm1=Timer(1, freq=1000)</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led1=tm1.channel(2, Timer.PWM, pin=Pin('B0'))</font><br />
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<font face="Tahoma, Helvetica, SimSun, sans-serif"># 设置亮度（绿），0最亮，100最暗</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led1.pulse_width_percent(0)</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led1.pulse_width_percent(100)</font><br />
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<font face="Tahoma, Helvetica, SimSun, sans-serif"># led2（兰）使用TIM4_CH2</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">tm4=Timer(4, freq=1000)</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led2=tm4.channel(2, Timer.PWM, pin=Pin('B7'))</font><br />
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<font face="Tahoma, Helvetica, SimSun, sans-serif"># 设置亮度，0最暗，100最亮</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led2.pulse_width_percent(10)</font><br />
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<font face="Tahoma, Helvetica, SimSun, sans-serif"># led3（红）使用TIM4_CH2N</font><br />
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<font face="Tahoma, Helvetica, SimSun, sans-serif">tm8=Timer(8, freq=1000)</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led3=tm8.channel(2, Timer.PWM, pin=Pin('B14'))</font><br />
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<font face="Tahoma, Helvetica, SimSun, sans-serif"># 设置亮度，0最亮，100最暗</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led3.pulse_width_percent(90)</font><br />
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<font face="Tahoma, Helvetica, SimSun, sans-serif">#led3也可以使用TIM12_CH1</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">tm12=Timer(12, freq=1000)</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led3=tm12.channel(1, Timer.PWM, pin=Pin('B14'))</font><br />
<font face="Tahoma, Helvetica, SimSun, sans-serif">led3.pulse_width_percent(0)</font><br />
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