蓝桥杯嵌入式 - 互补输出PWM

 STM32互补输出在第六届国赛中有用到。互补输出就是两个通道，一个输出一定频率、占空比的PWM，而和他互补的通道输出相反的方波。（就是A通道高电平B就低电平）

1. 程序
    程序部分和普通PWM配置差不多，只是打开了互补输出而已。

   void PWM(uint16_t Peroid, uint16_t duty)
   {
   	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
   	TIM_OCInitTypeDef  TIM_OCInitStructure;
   	GPIO_InitTypeDef GPIO_InitStructure;
   	
   	uint16_t TimerPeriod = 1000000/Peroid;	//定时器周期
   	uint16_t duty1 =  duty*TimerPeriod/100;	//比较值
   	
   	RCC_APB2PeriphClockCmd(	RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA |
   							RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO, ENABLE);
   	
   	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
   	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   	GPIO_Init(GPIOA, &GPIO_InitStructure);
   	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
   	GPIO_Init(GPIOB, &GPIO_InitStructure);
   	
   	TIM_TimeBaseStructure.TIM_Prescaler = 71;
   	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
   	TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
   	TIM_TimeBaseStructure.TIM_ClockDivision = 0;
   	TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
   	TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
   	
   	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
   	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
   	TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
   	TIM_OCInitStructure.TIM_Pulse = duty1;
   	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
   	TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
   	TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
   	TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
   	TIM_OC2Init(TIM1, &TIM_OCInitStructure);
   
   	TIM_Cmd(TIM1, ENABLE);
   	TIM_CtrlPWMOutputs(TIM1, ENABLE);
   }
   

 那麽问题来了，上面太难看不懂咋整， 我只能说在库例程的 ComplementarySignals 里面复制下来删掉死区时间配置的部分就差不多了

2. 结果