如何用STM32产生相位差180度，且占空比可调的两路PWM
最近需要用到两路相位差180度，且占空比可调的PWM，看到论坛上说用输出比较模式，但输出比较模式只能产生一定相位差且占空比固定的PWM，求助自己顶起来:lol 使用TIM1的反相输出功能，具体你可以看官方例程，大概代码如下：//TIM1做PWM输出
void Tim1_Config(void)
{
TimerPeriod =(SystemCoreClock / 20000 ) - 1;
ccr1 = TimerPeriod / 2;//占空比1/2 = 50%
ccr2 = TimerPeriod / 3;//占空比1/3 = 33%
ccr3 = TimerPeriod / 4;//占空比1/4 = 25%
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
//时基初始化
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; //死区控制用。
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;//计数器方向
TIM_TimeBaseInitStructure.TIM_Prescaler = 0; //Timer clock = sysclock /(TIM_Prescaler+1) = 168M
TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInitStructure.TIM_Period = TimerPeriod - 1;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = ccr1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM1,&TIM_OCInitStructure);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
}例如使用OC1/OC1N两个通道输出反向信号如下，是否你要的效果？
http://images.cnitblog.com/blog/79656/201306/02205939-6554aa9b793648eaa488822decfbf906.jpg
http://images.cnitblog.com/blog/79656/201306/02205920-5fd79236b31440a7b3f8866608182bae.jpg
http://images.cnitblog.com/blog/79656/201306/02205904-5b8abb9bf12b4f4f99be58965abeafa9.jpg
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