標(biāo)題: stm32通過tim定時(shí)器中斷，進(jìn)行周期性任務(wù) [打印本頁]
作者: l雷厲風(fēng)行l(wèi)    時(shí)間: 2019-12-13 15:38
標(biāo)題: stm32通過tim定時(shí)器中斷，進(jìn)行周期性任務(wù)
//下面是定時(shí)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(shí)鐘
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能 GPIOB 時(shí)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(jì)數(shù)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(zhuǎn)模式，產(chǎn)生中斷后，輸出管腳電平翻轉(zhuǎn)，可設(shè)置成其他模式，百度一下就好
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;         //輸出為負(fù)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(jì)時(shí)器達(dá)到多少后產(chǎn)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(yù)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(yōu)先級(jí) 2 級(jí)
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //從優(yōu)先級(jí) 0 級(jí)
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ 通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化外設(shè) NVIC 寄存器
TIM_ITConfig(TIM3,TIM_IT_CC3,ENABLE);

  /* TIM enable counter */
  TIM_Cmd(TIM3, ENABLE);      //開啟計(jì)數(shù)器

  /* TIM IT enable */                //TIM1中斷源設(shè)置，開啟相應(yīng)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(shí)器 3 中斷服務(wù)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(fā)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(jì)數(shù)器中的計(jì)數(shù)值
    TIM_SetCompare3(TIM3, capture + 500 );        //將計(jì)數(shù)值加上翻轉(zhuǎn)的脈沖值寫入輸出比較寄存器中，以保證下一個(gè)TIM事件，可以實(shí)現(xiàn)周期性產(chǎn)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(nèi)容，實(shí)現(xiàn)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]);
  }
}


APP.zip

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作者: 心癮難戒    時(shí)間: 2019-12-13 16:51
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