stm32通过tim定时器中断，进行周期性任务

ID:663293 · 发表于 2019-12-13 15:38

//下面是定时器TIM3_CH3的初始化，如果需要更换或添加TIM的其他通道，直接修改管脚和下面的注释即可

void TIM3_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能 TIM3 时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能 GPIOB 时钟

//TIM3_CH3-->PB0
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_Init(GPIOB , &GPIO_InitStructure);

/* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 65535;       //这里必须是65535
  TIM_TimeBaseStructure.TIM_Prescaler = 71;          //72（71+1）分频，也就是1MHz（主频72MHz）
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;    //
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数模式

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);       //初始化TIM3

  /* Output Compare Toggle Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; //输出比较翻转模式，产生中断后，输出管脚电平翻转，可设置成其他模式，百度一下就好
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;       //输出为负逻辑
  /*TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //使能通道1
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;                      //待装入输出比较寄存器中的脉冲值，也就是计时器达到多少后产生中断
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);       //写入配置
  TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);*/       //使能或者失能TIMx在CCR1上的预装载寄存器

  /* Output Compare Toggle Mode configuration: Channel2 */
  /*TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
  TIM_OC2Init(TIM3, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable);*/

  /* Output Compare Toggle Mode configuration: Channel3 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = PPM_IN[ppm_i];
  TIM_OC3Init(TIM3, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable);

  /* Output Compare Toggle Mode configuration: Channel4 */
  /*TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
  TIM_OC4Init(TIM3, &TIM_OCInitStructure);
  TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable);*/

//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3 中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级 2 级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //从优先级 0 级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ 通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化外设 NVIC 寄存器
TIM_ITConfig(TIM3,TIM_IT_CC3,ENABLE);

  /* TIM enable counter */
  TIM_Cmd(TIM3, ENABLE);    //开启计数器

  /* TIM IT enable */             //TIM1中断源设置，开启相应通道的捕捉比较中断
  //TIM_ITConfig(TIM3, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);
//TIM_ITConfig(TIM3, TIM_IT_CC3, ENABLE);

}
//定时器 3 中断服务程序
void TIM3_IRQHandler(void)
{
/*if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)    //检查指定的TIM（3通道）中断发生与否
  {
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3 );       //清除TIMx的中断待处理位
capture = TIM_GetCapture3(TIM3);                //获得输入捕获值，即计数器中的计数值
TIM_SetCompare3(TIM3, capture + 500 );       //将计数值加上翻转的脉冲值写入输出比较寄存器中，以保证下一个TIM事件，可以实现周期性产生中断
  }*/

   if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)//（tim3，3通道），这部分是我工程中用到的，也可以改成上面的内容，实现周期性中断
  { //outdata();
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);
capture = TIM_GetCapture3(TIM3);
      if(ppm_i==nPPM*2+1){
         ppm_i=0;
      }else{
         ppm_i++;
      }
TIM_SetCompare3(TIM3, capture + PPM_IN[ppm_i]);
  }
}

ID:663370 · 发表于 2019-12-13 16:51

感谢，对我帮助很大，挺你

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stm32通过tim定时器中断，进行周期性任务

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