void buhuo_init()   //timer1初始化  我用的是f103rct6   pa12 做输入检测口   另外用tim2  输出一个pwm
{
 GPIO_InitTypeDef  GPIO_InitStructure;
 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
/* 配置A B两相输入管脚模式*/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); /*使能LED灯使用的GPIO时钟*/
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);   

  TIM_TimeBaseStructure.TIM_Period=999;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_ETRClockMode2Config(TIM1,TIM_ExtTRGPSC_OFF,TIM_ExtTRGPolarity_NonInverted,6);

  TIM1->DIER|=1<<0;   //允许更新中断  
  TIM1->DIER|=1<<6;   //允许触发中断  
TIM_SetCounter(TIM1,0);
TIM_Cmd(TIM1,ENABLE);
}
//下面这个是中断 预想的功能是  让timer1 做脉冲计数   比如我period设置为399   当检测到400个脉冲时溢出进入中断，然后关闭timer2。 因为我只需要400个脉冲
void TIM1_UP_IRQHandler(void)  
{                
if(TIM1->SR&0X0001)//溢出中断  
{  
    printf(" 产生溢出中断！ ");
 TIM_ARRPreloadConfig(TIM2, DISABLE);
TIM_Cmd(TIM2, DISABLE);
}      
  printf(" 捕获值：%d ",TIM_GetCounter(TIM1));
    TIM_ClearITPendingBit(TIM1, TIM_FLAG_Update);

}