关于捕获输入方面的程序问题

ccwd · 发表于 2022-7-26 22:51:09

请问为啥我的程序，我就按了一会就这么多秒是咋回事，我看着时间按得

这是我的.c文件
#include "sys.h"
#include "ic.h"
#include "key.h"
#include "uart.h"
#include "led.h"
u16 TIM5_STA;
u16 TIM5_FLAG;
void TIM_IC_init(u16 arr,u16 pc)
{
GPIO_InitTypeDef GPIO_instruct;
TIM_TimeBaseInitTypeDef Time_instruct;
NVIC_InitTypeDef NVIC_instruct;
TIM_ICInitTypeDef TIM_instruct;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE);

GPIO_instruct.GPIO_Mode=GPIO_Mode_IPD;
GPIO_instruct.GPIO_Pin=GPIO_Pin_0;
GPIO_instruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_instruct);
GPIO_ResetBits(GPIOA,GPIO_Pin_0);

Time_instruct.TIM_CounterMode=TIM_CounterMode_Up;
Time_instruct.TIM_Period=arr;
Time_instruct.TIM_Prescaler=pc;
Time_instruct.TIM_RepetitionCounter=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM5,&Time_instruct);

NVIC_instruct.NVIC_IRQChannel=TIM5_IRQn;
NVIC_instruct.NVIC_IRQChannelCmd=ENABLE;
NVIC_instruct.NVIC_IRQChannelPreemptionPriority=2;
NVIC_instruct.NVIC_IRQChannelSubPriority=2;
NVIC_Init(&NVIC_instruct);

TIM_instruct.TIM_Channel=TIM_Channel_1;
TIM_instruct.TIM_ICFilter=0x00;
TIM_instruct.TIM_ICPolarity=TIM_ICPolarity_Rising;
TIM_instruct.TIM_ICPrescaler=TIM_ICPSC_DIV1;
TIM_instruct.TIM_ICSelection=TIM_ICSelection_DirectTI;
TIM_ICInit(TIM5,&TIM_instruct);

TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);
TIM_Cmd(TIM5,ENABLE);

}

void TIM5_IRQHandler(void)
{
if((TIM5_FLAG&0x4000)==0)
{ if(TIM_GetITStatus(TIM5,TIM_IT_Update)==SET)
   {
TIM5_FLAG++;
if(TIM5_FLAG==0x3FFF) TIM5_FLAG=0x0000;
   }
   if( TIM_GetITStatus(TIM5,TIM_IT_CC1)==SET)
{
if((TIM5_FLAG&0x8000)==1)
{
TIM5_FLAG|=0x4000;
TIM5_STA=TIM_GetCapture1(TIM5);
TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);
}
TIM5_FLAG|=0x8000;
TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);
}
}
TIM_ClearITPendingBit(TIM5,TIM_IT_Update|TIM_IT_CC1);
}

这是.h文件

#ifndef __IC_
#define __IC_
#include "sys.h"

void TIM_IC_init(u16 arr,u16 pc);

#endif

这是主函数

#include "stm32f10x.h"
#include "sys.h"
#include "ic.h"
#include "key.h"
#include "uart.h"
#include "stdio.h"
#include "led.h"
extern u16 TIM5_FLAG;
extern u16 TIM5_STA;
int main()
{
   double temp,t;
LED_init();
init_key();
   init_uart();
   TIM_IC_init(0xffff,72-1);
LED0=0;
while(1)
{
if(TIM5_FLAG&0xc000)
{
temp=TIM5_FLAG&0x3fff;
t=temp*65536;
t=(t+TIM5_STA)/1000000;
printf("\r\n******ê±¼äÎa￡o%lfs*******\r\n",t);
TIM5_FLAG=0x0000;
   TIM5_STA=0;

}
}
}

请问有啥问题