TIM2输入捕获init出了问题

我有一个围绕STM8S105构建的嵌入式系统，除其他外，它必须测量脉冲输入的频率。脉冲在引脚29（PD4 / tiM2 CH1）上进入，每秒0到大约1200个脉冲。以下是我对定时器和中断功能的初始化。我知道中断是以输入速率发生的，因为我用示波器和中断功能中的测试输出进行了检查。但是当我在中断函数中读取计数器寄存器时，它总是不同的，几乎是随机的。看起来计数器永远不会重置，但我不知道为什么。我知道它正在计数输入脉冲，因为当我停止输入时，中断停止。请看看我的init和中断函数，并告诉我我做错了什么。

谢谢

我的初始化函数：

我的中断功能：


＃tim2＃stm8 #capture



以下为原文




I have an embedded system built around a STM8S105 which, among other things, must measure the frequency of a pulsed input. The pulses are coming in on pin 29 (PD4/TIM2 CH1) anywhere from 0 to about 1200 pulses per second. What follows is my initialization of the timer and the interrupt function. I know the interrupts are happening at the input rate because I checked with an oscilloscope and a test output in the interrupt function. But when I read the counter register in the interrupt function, it is always different, almost random. It looks like the counter never resets but I don't know why. I know it is counting input pulses because when I stop the input, the interrupts stop. Please take a look at my init and interrupt functions and tell me what I am doing wrong.

Thanks

My initialize function:

• 
  

• TIM2->CCER1 = TIM2_CCER1_CC1E;
  

• TIM2->IER = TIM2_IER_CC1IE;
  

• TIM2->CR1 = TIM2_CR1_CEN;
  

• i = (u16)(CLK_GetClockFreq() / 62500);
  

• TIM2->ARRH = (u8)((i >> 8) & 0xFF);
  

• TIM2->ARRL = (u8)(i & 0xFF);
  

• TIM2->EGR = TIM2_EGR_CC1G;
  

My interrupt function:

• u16 h,l;
  

• h = (u16)TIM2->CCR1H;
  

• l = (u16)TIM2->CCR1L;
  

• inPulseCount = (h <<
  

• 8
  

• ) | l;
  

• TIM2->SR1 = TIM2_SR1_RESET_VALUE;
  

• TIM2->SR2 = TIM2_SR2_RESET_VALUE;
  

  
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