STM32F103定时器输入捕获解码9148遥控器程序

ID:668227 · 发表于 2019-12-20 11:15

一，定时器初始化
/*******************************************************************************
* 函数名       : time1_init
* 函数功能                : 定时器1端口初始化函数
* 输入       : 无
* 输出       : 无
*******************************************************************************/
void time1_init()
{
      TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;       //声明一个结构体变量，用来初始化GPIO

      TIM_ICInitTypeDef TIM1_ICInitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      /* 开启定时器1时钟 */
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

      TIM_ClearITPendingBit(TIM1,TIM_IT_Update);//清除TIMx的中断待处理位:TIM 中断源
      TIM_TimeBaseInitStructure.TIM_Period =9999;//设置自动重装载寄存器周期的值100MS
      TIM_TimeBaseInitStructure.TIM_Prescaler = 719;//设置用来作为TIMx时钟频率预分频值，100Khz计数频率
      TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;//0; //设置时钟分割:TDTS = Tck_tim
      TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;//TIM向上计数模式
      TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructure);

      /* 设置中断参数，并打开中断 */
      TIM1_ICInitStructure.TIM_Channel = TIM_Channel_4; //捕获通道
      TIM1_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //xia沿捕获
      TIM1_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //直接映射
      TIM1_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //不分频每个变化捕获
      TIM1_ICInitStructure.TIM_ICFilter = 0x00;//不滤波
      TIM_ICInit(TIM1, &TIM1_ICInitStructure);

      /* 设置NVIC参数 */
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
      NVIC_InitStructure.NVIC_IRQChannel=TIM1_CC_IRQn; ////TIM1 捕获中断
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;       //抢占优先级为0
      NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;  //响应优先级为1
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;       //使能
      NVIC_Init(&NVIC_InitStructure);

      TIM_ITConfig(TIM1,TIM_IT_Update|TIM_IT_CC4,ENABLE);    //使能更新中断和捕获中断

      TIM_Cmd(TIM1, ENABLE);       //使能定时器//使能或者失能TIMx外设

  TIM_ClearITPendingBit(TIM1, TIM_IT_Update|TIM_IT_CC4 );    //清除标识
}
二、中断处理

/* 遥控器解码

*/
void TIM1_CC_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //检查TIM1更新中断标识
  {

                        overflow++;
  }

  if (TIM_GetITStatus(TIM1, TIM_IT_CC4) != RESET) //检查TIM1通道4捕获标识
  {
            if(state==WAIT_FALLING) // 捕获下降沿
            {
                     TIM1CH4_CAPTURE_VAL = TIM_GetCapture4(TIM1);//获得输入捕获的值
                     yktimvalue = TIM1CH4_CAPTURE_VAL + (overflow*720);
                     //判断高电平持续时间大于 208a-87776vs  80a=33760vs/3520  a=422vs                      3a=1266 vs
                     if(yktimvalue>8770)
                     {
                              ykaj_num = 0;
                              ykaj_value= 0;
                     }
                     overflow = 0;
                     TIM_SetCounter(TIM1,0);
                     state = WAIT_RISING;
                     TIM_OC4PolarityConfig(TIM1,TIM_ICPolarity_Rising); //设置上升沿触发
            }
            else if(state==WAIT_RISING) //捕获上升沿
            {
                     TIM1CH4_CAPTURE_VAL = TIM_GetCapture4(TIM1);
                     yktimvalue = TIM1CH4_CAPTURE_VAL;

                     //判断低电平持续时间 422 1266 vs
                     if(yktimvalue>40 && yktimvalue<50)
                     {
                              ykaj_bit=0;//收到数据 0
                     }
                     else if(yktimvalue>125 && yktimvalue<135)
                     {
                              ykaj_bit=1;//收到数据 1
                     }
                     ykaj_value<<=1;
                     ykaj_value+=ykaj_bit;
                     ykaj_num++;
                     if(ykaj_num>=24)
                     {
                              yk_keys       =(u16)ykaj_value;
                              yk_keys&=0x0fff;
                              ykaj_value>>=12;
                              if(yk_keys==(u16)ykaj_value)
                              {
                                    ykaj_bzok=1;
                              }
                              else
                              {
                                    ykaj_num = 0;
                                    ykaj_value= 0;
                              }
                     }
                     if(yktimvalue<40 || yktimvalue>135)
                     {
                              ykaj_num = 0;
                              ykaj_value= 0;
                     }

                     overflow = 0;
                     TIM_SetCounter(TIM1,0);
                     state = WAIT_FALLING;
                     TIM_OC4PolarityConfig(TIM1,TIM_ICPolarity_Falling); //设置下降沿触发
            }
  }

  TIM_ClearITPendingBit(TIM1, TIM_IT_Update|TIM_IT_CC4 );    //清除标识

}

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STM32F103定时器输入捕获解码9148遥控器程序

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