各位大神请问定时器如何同时开启溢出中断和pwm输出呢

chenghuayou · 发表于 2017-5-18 09:23:48

本帖最后由 chenghuayou 于 2017-5-18 09:27 编辑

我是用的是定时器3，想要同时开启中断和pwm输出，但是结果中断函数没有问题，但是没有PWM输出---------------------求指教
void Gear_Pwm(u16 arr,u16 psc)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;
      NVIC_InitTypeDef NVIC_InitStruct;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //使能GPIO外设时钟使能
      //设置该引脚为复用输出功能,输出TIM3 CH1 的PWM脉冲波形
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //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(GPIOA, &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
      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(TIM3, &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1
      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
      TIM_OCInitStructure.TIM_Pulse = 800;                         //设置待装入捕获比较寄存器的脉冲值
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    //输出极性:TIM输出比较极性高
      TIM_OC1Init(TIM3, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
      //TIM_OC4Init(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

      //TIM_CtrlPWMOutputs(TIM3,ENABLE);       //MOE 主输出使能

      TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //CH1预装载使能
      //TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH4预装载使能

      //TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器
      TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);

      NVIC_InitStruct.NVIC_IRQChannel=TIM3_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=2;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority=2;
      NVIC_Init(&NVIC_InitStruct);


      TIM_Cmd(TIM3, ENABLE);  //使能TIM1
}

void TIM3_IRQHandler()
{
      if(TIM_GetITStatus(TIM3,TIM_IT_Update)==1)
      {
            TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
            printf("定时器3中断没问题\r\n");

      }
}

qq1508448759 · 发表于 2017-5-18 09:37:55

void TIM3_Int_Init(u16 arr,u16 psc)
{
  GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
//定义结构体
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //使能GPIO外设时钟使能
//初始化时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //TIM3_CH3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
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    计数到5000为500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率
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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
//设置预分频，自动重装周期
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性高
TIM_OC1Init(TIM3, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
TIM_CtrlPWMOutputs(TIM3,ENABLE); //MOE 主输出使能
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //CH1预装载使能
TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器
TIM_Cmd(TIM3, ENABLE);
//设置PWM相关参数，并立即使能
TIM_ITConfig(  //使能或者失能指定的TIM中断
TIM3, //TIM2
TIM_IT_Update ,
ENABLE  //使能
);

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
//使能中断
TIM_Cmd(TIM3, ENABLE);  //使能TIMx外设

}

以前写的中断+PWM，你可以参考一下