蓝桥杯单片机国赛第三届，为什么我继电器闭合5s后不断开？

Question

按题目要求，继电器闭合后，应该在5s之后断开，但是我的代码闭合之后就一直闭合，不断开了，这是为什么？
主函数main.c

#include <STC15F2K60S2.H>
#include "hardware.h"
#include "iic.h"
#include "ds1302.h"
#include "intrins.h"
unsigned char Write_ds1302_addr[]={0x80,0x82,0x84,0x86,0x88,0x8a,0x8c};
unsigned char Read_ds1302_addr[]={0x81,0x83,0x85,0x87,0x89,0x8b,0x8d};
unsigned char Timer[]={0x00,0x59,0x06,0x09,0x05,0x04,0x24};
sbit Tx=P1^0;
sbit Rx=P1^1;
unsigned int distance=0;
unsigned char timerh=0;
//------------------------------------------------------------------------
void write_time()
{
    char i;
    Write_Ds1302_Byte(0x8e,0x00);
    for(i=0;i<7;i++)
    {
        Write_Ds1302_Byte(Write_ds1302_addr[i],Timer[i]);
    }
    Write_Ds1302_Byte(0x8e,0x80);
}
//------------------------------------------------------------------------
void Read_time()
{
    char i;
    for(i=0;i<7;i++)
    {
        Timer[i]=Read_Ds1302_Byte(Read_ds1302_addr[i]);
    }
}
//------------------------------------------------------------------------
void SMG_display()
{
    
    SMG_buf[0]=Timer[2]/16;
    SMG_buf[1]=Timer[2]%16;
    SMG_buf[2]=17;
    SMG_buf[3]=Timer[1]/16;
    SMG_buf[4]=Timer[1]%16;
    SMG_buf[5]=17;
    SMG_buf[6]=Timer[0]/16;
    SMG_buf[7]=Timer[0]%16;

}
//------------------------------------------------------------------------
void Delay14us()        //@12.000MHz
{
    unsigned char i;

    _nop_();
    _nop_();
    i = 39;
    while (--i);
}
//------------------------------------------------------------------------
void sendwave()
{
    unsigned char i=0;
    for(i=0;i<8;i++)
    {
        Tx=1;
        Delay14us();
        Tx=0;
        Delay14us();
    }
  
}    
//------------------------------------------------------------------------
unsigned int csb_read()
{
    unsigned int time=0;
    CMOD=0x00;
    CH=CL=0;
    sendwave();
    CR=1;
    while((Rx==1)&&(CF==0));
    CR=0;
    if(CF==1)
    {
        CF=0;
        return 999;
    }
    else
    {
        time=(CH<<8)|CL;
        return (time*0.017)+3;
    }
}
//------------------------------------------------------------------------
void judge_door()
{

    /*if(Timer[2]>=0x07 && Timer[2]<0x22)
    {*/
        if(distance<30)
        {
            bz_open=1;
        }
        else if(distance>=30)
        {
            bz_open=0;
        }
    //}
}
//------------------------------------------------------------------------
void open_door()
{
    if(bz_open==1)
    {
        ws_buf=0x10;
        flag=1;
        //timers=Timer[2]/16*10+Timer[2]%16;
        if(bz_5s==1)
        {
            bz_5s=0;
            ws_buf=0x00;
            bz_open=0;
            timer5s=0;
        }
    }
   if(bz_open==0)
    {
        ws_buf=0x00;
        bz_5s=0;
        timer5s=0;
    }
}
//------------------------------------------------------------------------
void main()
{    
    Timer1Init();
    write_time();
    while(1)
    {
        SMG_display();
        if(timer200ms>=200)
        {
            timer200ms=0;
            Read_time();
            distance=csb_read();
        }
        judge_door();
        open_door();
    }
}

hardware.c

#include<STC15F2K60S2.H>
#include"hardware.h"
/*************  本地常量声明    **************/
unsigned char code t_display[]={                       //标准字库
//   0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
    0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,
//black  -     H    J    K    L    N    o   P    U     t    G    Q    r   M    y
    0x00,0x40,0x76,0x1E,0x70,0x38,0x37,0x5C,0x73,0x3E,0x78,0x3d,0x67,0x50,0x37,0x6e,
    0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF,0x46};    //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1

unsigned char code T_COM[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};      //位码
unsigned char led_buf=0xff;
unsigned char ws_buf=0x00;
unsigned char SMG_buf[]={16,16,16,16,16,16,16,16};
unsigned int timer10ms=0;
unsigned int timer200ms=0;
unsigned int timer5s=0;
unsigned char key_stat=0;
unsigned char key_value=0;
unsigned char key_values[4][4]=
{
   {12,13,14,15},
   {8,9,10,11},
   {4,5,6,7},
   {0,1,2,3},
};
bit bz_5s=0;
bit bz_open=0;//开关门标志
//----------------------------------------------------------------------
void Timer1Init()        //1毫秒@12.000MHz
{
    AUXR |= 0x40;        //定时器时钟1T模式
    TMOD &= 0x0F;        //设置定时器模式
    TL1 = 0x20;        //设置定时初值
    TH1 = 0xD1;        //设置定时初值
    TF1 = 0;        //清除TF1标志
    TR1 = 1;        //定时器1开始计时
    EA=1;
    ET1=1;
}

//---------------------------------------------------------------------
void SelectHC573(unsigned char channel)
{
    switch(channel)
    {
       case 4:
         P2=(P2 & 0x1f)|0x80;
       break;
       case 5:
         P2=(P2 & 0x1f)|0xa0;
       break;
       case 6:
         P2=(P2 & 0x1f)|0xc0;
       break;
       case 7:
         P2=(P2 & 0x1f)|0xe0;
       break;
       case 0:
         P2=(P2 & 0x1f)|0x00;
       break;
    }
}
//---------------------------------------------------------------------
void led_output()
{          
    P0=led_buf;
    SelectHC573(4);
    SelectHC573(0);
}
//---------------------------------------------------------------------
void ws_output()
{
       
    P0=ws_buf;
    SelectHC573(5);
    SelectHC573(0);
}
//---------------------------------------------------------------------
void SMG_output()
{
   static unsigned char SMG_com=0;

       
    P0=0x00;
    SelectHC573(6);
    SelectHC573(0);

    P0=~t_display[SMG_buf[SMG_com]];
    SelectHC573(7);
    SelectHC573(0);
    
    P0=T_COM[SMG_com];
    SelectHC573(6);
    SelectHC573(0);

    

    if(++SMG_com>=8)
    {
      SMG_com=0;
    }
}
//---------------------------------------------------------------------
void ServiceTimer()interrupt 3
{
    SMG_output();
    led_output();
    ws_output();
    timer10ms++;
    timer200ms++;
    if(bz_open==1)
    {
        timer5s++;
        if(timer5s>=5000)
        {        
            bz_5s=1;
            timer5s=0;
        }
    }
}
//----------------------------------------------------------------------
void Scankey()
{
    unsigned char R,C;
  P3=0x0f;
  P4=0x00;
  if(~P3&0x0f)
  {
     if(key_stat<255)
       key_stat++;
     if(P33==0)
       R=0;
     if(P32==0)
        R=1;
     if(P31==0)
        R=2;
     if(P30==0)
        R=3;
     P3=0xf0;
     P4=0xff;
     if(P44==0)
         C=0;
     if(P42==0)
         C=1;
     if(P35==0)
         C=2;
     if(P34==0)
         C=3;
     key_value=key_values[R][C];
  }
  else 
  {
    key_stat=0;
    key_value=0;
  }
}

Answer 1

请检查你的延时函数实现，可能时间计算或调用有误。

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