输入捕获实验，串口没有显示wake_up按键按下的时间

taomao · 发表于 2019-10-21 07:50:43

捕获程序如下#include "timer.h"
#include "led.h"
#include "usart.h"
void TIM5_Cap_Init(u16 arr,u16 psc)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
      TIM_ICInitTypeDef TIM_ICInitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

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

   GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_Init(GPIOA,&GPIO_InitStructure);
   GPIO_setBits(GPIOA,GPIO_Pin_0);//按键下拉输入

      NVIC_InitStructure.NVIC_IRQChannel=TIM5_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
      NVIC_Init(&NVIC_InitStructure);

TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
      TIM_TimeBaseInitStructure.TIM_Period=arr;
      TIM_TimeBaseInitStructure.TIM_Prescaler=psc;
      TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM5,&TIM_TimeBaseInitStructure);

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

      TIM_Cmd(TIM5,ENABLE);
      TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);
}
u8 TIM5_STA=0;//第七位为1完成高电平捕获，即按键按下的时间，第六位为0，按键刚刚按下，低5为为定时器溢出的次数
      u16 TIM5_VAL=0;//高电平计时

void TIM5_IRQHandler()
{

      if((TIM5_STA&0x80)==0)//还未捕获高电平
      {                  printf("liuxiaoke");//此语句用来测试程序是否能产生定时器更新中断

            if(TIM_GetITStatus(TIM5,TIM_IT_Update)!=RESET)
            {

                     if(TIM5_STA&0x40)//按键已经按下
                     {
                              if((TIM5_STA&0x3F)==0x3F)
                              {
                                    TIM5_STA|=0x80;
                                    TIM5_VAL=0XFFFF;
                              }else TIM5_STA++;
                     }
            }
            if(TIM_GetITStatus(TIM5,TIM_IT_CC1)!=RESET)
            {
                     printf("QQQ")//此语句用来测试程序是否能产生定时器捕获中断

                        if(TIM5_STA&0x40)
                     {
                              TIM5_STA|=0x80;
                              TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising);
                              TIM5_VAL=TIM_GetCapture1(TIM5);
                     }
                     else
                     {

                              TIM5_STA=0;
                              TIM5_VAL=0;
                              TIM5_STA|=0x40;
                              TIM_SetCounter(TIM5,0);
                              TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);//按键刚刚按下，改为下降沿捕获
                     }
            }
      }
      TIM_ClearITPendingBit(TIM5,TIM_IT_Update|TIM_IT_CC1);
}
主函数如下

extern u8  TIM5_STA;             //输入捕获状态
extern u16 TIM5_VAL;       //输入捕获值
int main(void)
{
u32 temp=0;
delay_init();                   //延时函数初始化
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);       //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
uart_init(115200);       //串口初始化为115200

TIM5_Cap_Init(0XFFFF,72-1);       //以1Mhz的频率计数，arr=2^16=65536
while(1)
{
      delay_ms(10);
      if(TIM5_STA&0X80)//成功捕获到了一次上升沿
      {
         temp=TIM5_STA&0X3F;
         temp*=65536;//溢出时间总和
         temp=(temp+TIM5_VAL)/1000000;//得到总的高电平时间
         printf("HIGH:%d s\r\n",temp);//打印总的高点平时间
         TIM5_STA=0;//开启下一次捕获
      }
}
}

没有任何实验现象，其他的程序比如串口发送都是例程给的，我就仿写了主程序和捕获程序，对照一样，就是不行，按键按下，发现程序无法进入捕获中断