STM32F103TIM1高级定时器PWM使能代码

void TIM1_PWM_Init(u16 arr,u16 psc)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);// 
 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE);  //使能GPIO外设时钟使能
	                                                                     	

   //设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; 			//TIM_CH1
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  	//复用推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);

	
	TIM_TimeBaseStructure.TIM_Period = arr; 			//设置在下一个更新事件装入活动的自动重装载寄存器周期的值	 80K
	TIM_TimeBaseStructure.TIM_Prescaler =psc; 			//设置用来作为TIMx时钟频率除数的预分频值  不分频
	TIM_TimeBaseStructure.TIM_ClockDivision = 0; 		//设置时钟分割:TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
	TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); 	//根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

 
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 	//选择定时器模式:TIM脉冲宽度调制模式2
	TIM_OCInitStructure.TIM_Pulse = 8; 			//设置待装入捕获比较寄存器的脉冲值
	
//	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能  /*输出CHx引脚的PWM*/
//	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
//	TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Set;//空闲状态下CH通道引脚的状态
	
	TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;//输出CHxN引脚的PWM
	TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
	TIM_OCInitStructure.TIM_OCNIdleState=TIM_OCNIdleState_Set;



	TIM_OC3Init(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
	TIM_OC3FastConfig(TIM1,TIM_OCFast_Enable);//使能输出比较快速功能
	

	TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH3预装载使能	 
	TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
	TIM_Cmd(TIM1, ENABLE);  //使能TIM1
	
	TIM_CtrlPWMOutputs(TIM1,ENABLE);	//PWM 主输出使能	
	
}

这段代码使能的都是CH3N引脚的PWM。如果要使能CH3引脚就注释掉这段，换上面那一段。 但是有一点需要 注意这里TIM_OCInitStructure.TIM_Pulse 的值不能超过定时器初始化自动装载的周期值。否则没有PWM。