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標題: stm32通過tim定時器中斷，進行周期性任務 [打印本頁]

作者: l雷厲風行l 時間: 2019-12-13 15:38
標題: stm32通過tim定時器中斷，進行周期性任務
//下面是定時器TIM3_CH3的初始化，如果需要更換或添加TIM的其他通道，直接修改管腳和下面的注釋即可

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 時鐘
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能 GPIOB 時鐘

//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;       //這里必須是65535
  TIM_TimeBaseStructure.TIM_Prescaler = 71;          //72（71+1）分頻，也就是1MHz（主頻72MHz）
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;    //
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上計數模式

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

  /* Output Compare Toggle Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; //輸出比較翻轉模式，產生中斷后，輸出管腳電平翻轉，可設置成其他模式，百度一下就好
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;       //輸出為負邏輯
  /*TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //使能通道1
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;                      //待裝入輸出比較寄存器中的脈沖值，也就是計時器達到多少后產生中斷
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);       //寫入配置
  TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);*/       //使能或者失能TIMx在CCR1上的預裝載寄存器

  /* 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);*/

//中斷分組初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3 中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占優先級 2 級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //從優先級 0 級
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ 通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化外設 NVIC 寄存器
TIM_ITConfig(TIM3,TIM_IT_CC3,ENABLE);

  /* TIM enable counter */
  TIM_Cmd(TIM3, ENABLE);    //開啟計數器

  /* TIM IT enable */             //TIM1中斷源設置，開啟相應通道的捕捉比較中斷
  //TIM_ITConfig(TIM3, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);
//TIM_ITConfig(TIM3, TIM_IT_CC3, ENABLE);

}
//定時器 3 中斷服務程序
void TIM3_IRQHandler(void)
{
/*if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)    //檢查指定的TIM（3通道）中斷發生與否
  {
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3 );       //清除TIMx的中斷待處理位
capture = TIM_GetCapture3(TIM3);                //獲得輸入捕獲值，即計數器中的計數值
TIM_SetCompare3(TIM3, capture + 500 );       //將計數值加上翻轉的脈沖值寫入輸出比較寄存器中，以保證下一個TIM事件，可以實現周期性產生中斷
  }*/

   if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)//（tim3，3通道），這部分是我工程中用到的，也可以改成上面的內容，實現周期性中斷
  { //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]);
  }
}

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作者: 心癮難戒 時間: 2019-12-13 16:51
感謝，對我幫助很大，挺你

歡迎光臨 (http://www.zg4o1577.cn/bbs/)

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