mini板输入捕获测频率串口打印出来数据不符

congitoergosum · 发表于 2019-8-8 19:18:28

程序不知道哪里错了，连上信号源后串口打印出来全是0，求大佬帮忙看看

TIM_ICInitTypeDef  TIM3_ICInitStructure;

void TIM3_Cap_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
GPIO_InitTypeDef GPIO_InitStructure;

/* TIM3 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);

TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);  // Time base configuration

TIM_ETRClockMode2Config(TIM3, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
TIM_SetCounter(TIM3, 0);
TIM_Cmd(TIM3, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);

}

void TIM2_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM2_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  TIM_DeInit(TIM2);
  TIM2_TimeBaseStructure.TIM_Period =2499;
  TIM2_TimeBaseStructure.TIM_Prescaler = 7199;
  TIM2_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM2_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM2_TimeBaseStructure); // Time base configuration
  TIM_ClearFlag(TIM2,TIM_FLAG_Update);
  TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE );
  TIM_Cmd(TIM2, ENABLE);

  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

u16 count;
int sum;
float Frequency1;
u32 CAPTURE1;
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
      {
            TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
            CAPTURE1=(u32)TIM_GetCounter(TIM3);
            //CAPTURE2=(u32)TIM_GetCounter(TIM4);
            }
                     sum+=CAPTURE1;
                     count++;
                     if(count==4)
                     {
                        Frequency1=sum/4/0.25;
                        sum=0;
                        count=0;
printf("ÆμÂêêÇ￡o %f",Frequency1);
printf ("\r\n");
                     }
         TIM_SetCounter(TIM3,0);

}

extern int sum;
extern  float Frequency1;
int main(void)
{
delay_init();            //Ñóê±oˉêy3õê¼»ˉ
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);    //éèÖÃNVICÖD¶Ï·Ö×é2:2Î»ÇàÕ¼óÅÏè¼¶￡¬2Î»Ïìó|óÅÏè¼¶
uart_init(115200);    //′®¿ú3õê¼»ˉÎa115200
LED_Init();       //LED¶Ë¿ú3õê¼»ˉ
TIM3_Cap_Init(0XFFFF,72-1); //òÔ1MhzμÄÆμÂê¼Æêy
TIM2_Int_Init(2499,7199); //4hz
   while(1)
{

}
}