输入捕获实验

魑魅魍魉 · 发表于 2017-8-11 12:04:23

今天上午跟着例程把输入捕获实验自己写了一遍，可是按键按下去没反应，各位可以帮我看看是什么原因吗？程序代码如下：
c文件
[mw_shl_code=c,true]#include "sys.h"
#include "icap.h"
void icapinit(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitstructure;
NVIC_InitTypeDef NVIC_Initstructure;
TIM_ICInitTypeDef TIM_ICInitstructure;
GPIO_InitTypeDef GPIO_InitStructure;

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

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
  GPIO_Init(GPIOA,&GPIO_InitStructure);
  GPIO_ResetBits(GPIOA,GPIO_Pin_0);

TIM_TimeBaseInitstructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInitstructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitstructure.TIM_Period=arr;
TIM_TimeBaseInitstructure.TIM_Prescaler=psc;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitstructure);

TIM_ICInitstructure.TIM_Channel=TIM_Channel_1;
TIM_ICInitstructure.TIM_ICFilter=0000;
TIM_ICInitstructure.TIM_ICPolarity=TIM_ICPolarity_Rising;
TIM_ICInitstructure.TIM_ICPrescaler=TIM_ICPSC_DIV1;
TIM_ICInitstructure.TIM_ICSelection=TIM_ICSelection_DirectTI;
TIM_ICInit(TIM5,&TIM_ICInitstructure);

NVIC_Initstructure.NVIC_IRQChannel =TIM5_IRQn;
  NVIC_Initstructure.NVIC_IRQChannelPreemptionPriority=0x02;
  NVIC_Initstructure.NVIC_IRQChannelSubPriority=0;
  NVIC_Initstructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_Initstructure);

TIM_ITConfig(TIM5,TIM_IT_CC1,ENABLE);
TIM_Cmd(TIM5,ENABLE);
}

u8 sta=0;
u16 val;
void TIM5_IRQHandler(void)
{
  if ((sta&0x80)==0)
{
   if (TIM_GetITStatus(TIM5, TIM_IT_Update)!=RESET)
{
   if (sta&0x40)
{
   if ((val&0x3f)==0x3f)
{
   sta|=0x80;
val=0;
}
else sta++;
}
}
   if (TIM_GetITStatus(TIM5, TIM_IT_CC1)!=RESET)
   {
   if (sta&0x40)
   {
   sta|=0x80;
   val=TIM_GetCapture1(TIM5);
   TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising);
   }
   else
   {
      sta=0;
      val=0;
      TIM_SetCounter(TIM5,0);
      sta|=0X40;
      TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);
   }
   }
}
TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update);
}

[/mw_shl_code]

主函数
[mw_shl_code=c,true]#include "sys.h"
#include "key.h"
#include "delay.h"
#include "led.h"
#include "beep.h"
#include "exti.h"
#include "wdg.h"
#include "usart.h"
#include "timer.h"
#include "pwm.h"
#include "icap.h"
extern u8 sta;
extern u16 val;
int main()
{
u32 tem;
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
  uart_init(115200);
  ledinit();
keyinit();
delay_init();
beepinit();
extiinit();
icapinit(0XFFFF,72-1);
pwminit(899,0);
// timerinit(4999,7199);
//  iwdginit(4,625);
// wwdginit(0X5F,WWDG_Prescaler_8,0x7F);
  while(1)
{
if (sta&0x80)
{
   tem=sta&0x3f;
tem*=65536;
tem+=val;
printf("°′¼ü°′ÏÂê±¼äÎa%d",tem);
printf("HIGH:%d us\r\n",tem);
sta=0;
}
}
}
[/mw_shl_code]