TIM5_CCR1H和TIM5_CCR1L的值读出来不对

只看该作者 · 2016-6-18 07:52

定时器配置如下
TIM5_CAP_Init(3,0XFFFF);

void TIM5_CAP_Init(unsigned char psc,unsigned int arr)
{
  TIM5_PSCR = 0X0E;
  TIM5_CCER1 &= 0XEE; // 禁止输入捕获 1,2
  TIM5_CCER2 &= 0XFE; // 禁止输入捕获 3

  TIM5_CCMR1 |= 0x01; // ch1到ti1fp1
  TIM5_CCER1 |= 0x02; // ch1 下降沿触发

  TIM5_CCMR3 |= 0x01; // ch3选择 ti1fp2上
  TIM5_CCER2 |= 0x02; // ch3 下降沿触发 ic2

  TIM5_SMCR  |= 0X04; // 选源触发源和触发方式复位
  TIM5_IER |= 0x0a;    // 使能中断ch1 ch3

  TIM5_CCER1 |= 0x01; // 使能输入捕获 1
  TIM5_CCER2 |= 0X01; // 使能输入捕获 3 1111 1101

  TIM5_CNTRH = TIM5_CNTRL = 0;
  TIM5_CR1 = 0x03;    // Enabled update request source;Counter enabled;
}

#pragma vector = TIM5_CAPCOM_TIF_vector
__interrupt void TIM5_CAPCOM_TIF(void)
{
  static unsigned int i = 0,j = 0;

  //i = (unsigned int)(8<<TIM5_CCR3H);
  //i |= (unsigned int)(TIM5_CCR3L);

  if(TIM5_SR1 & 0x02)                //红外
  {
if( TIM5_CCER1 & 0x02)             //下降沿产生的中断
{
   i = 0;
   i = ( TIM5_CCR1H << 8 );
   i |= TIM5_CCR1L;
   //TIM5_CNTRH = TIM5_CNTRL = 0;
   TIM5_CCER1 &=~ 0x02;             //改为上升沿捕获
}
else                            //上升沿产生的中断
{
   j = 0;
   j = ( TIM5_CCR1H << 8 );
   j |= TIM5_CCR1L;
   //TIM5_CNTRH = TIM5_CNTRL = 0;
   TIM5_CCER1 |= 0x02;             //改为下降沿捕获
   //uiTenor |= TM1_CAP_FLAG;       //一段低电平时间捕获
}
TIM5_CNTRH = 0;
TIM5_CNTRL = 0;
  }
  if(TIM5_SR1 & 0x08)                //FG
  {
if(TIM5_CCER2 & 0x02)             //下降沿产生的中断
{
   i = ( TIM5_CCR3H << 8 );
   i |= TIM5_CCR3H;

   TIM5_CCER2 &=~ 0x02;             //改为上升沿捕获
}
else                            //上升沿产生的中断
{
   j = (TIM5_CCR3H << 8);
   j |= TIM5_CCR3L;

   TIM5_CCER2 |= 0x02;             //改为下降沿捕获
   //uiTenor |= TM1_CAP_FLAG;       //一段低电平时间捕获
}
  }
}//*/

TIM5_CCR1H和TIM5_CCR1L的值读出来不对，不管怎么调整预分频系数TIM5_CCR1H和TIM5_CCR1L的值都不会变化,求大师指点。