今天在做蓝桥杯单片机第四届省赛的时候遇到了一个奇怪的问题,就是在main.c里的Change()函数里,按键判断里面,那些所有的else if如果任意一个不加else,那么按下S6,单片机就没有任何反应,只有当所有的都加上else 之后,按下S6才会切换界面,这是为什么啊?
1、这是main.c文件
#include <STC15F2K60S2.H>
#include"hardware.h"
#include "ds1302.h"
unsigned char Write_ds1302_addr[7]={0x80,0x82,0x84,0x86,0x88,0x8a,0x8c};
unsigned char Read_ds1302_addr[7]={0x81,0x83,0x85,0x87,0x89,0x8b,0x8d};
unsigned char Timer[7]={0x00,0x30,0x08,0x16,0x03,0x07,0x24};// 24年周日3月16日8点30分
unsigned char stat=0;//0-自动,1-手动
unsigned char flag=0;
unsigned char cnt=50;
unsigned char sd=5;
//--------------------------------------------------
void DS1203_W()//写
{
char i;
Write_Ds1302_Byte(0x8e,0x00);//打开保护
for(i=0;i<7;i++)
{
Write_Ds1302_Byte(Write_ds1302_addr[i],Timer[i]);
}
Write_Ds1302_Byte(0x8e,0x80);//关闭保护
}
//-------------------------------------------------------
void DS1302_R()//读
{
char i;
for(i=0;i<7;i++)
{
Timer[i]=Read_Ds1302_Byte(Read_ds1302_addr[i]);
}
}
//------------------------------------------
void SMG_Display()
{
if(stat==0 )
{
if(flag==0)
{
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]=16;
SMG_buf[6]=flag/10;
SMG_buf[7]=flag%10;
}
else if(flag==1)
{
SMG_buf[0]=17;
SMG_buf[1]=17;
SMG_buf[2]=16;
SMG_buf[3]=16;
SMG_buf[4]=16;
SMG_buf[5]=16;
SMG_buf[6]=cnt/10;
SMG_buf[7]=cnt%10;
}
}
}
//------------------------------------------
void Change()
{
if(timer10ms>=10)
{
timer10ms=0;
Scankey();
if(key_value==7 && key_stat==2)
{
switch(stat)
{
case 0:
stat=1;
break;
case 1:
stat=0;
break;
}
}
else if (key_value==6 && key_stat==2 && flag==0 && stat==0)//自动状态下S6
{
flag=1;
}
else if(key_value==5 && key_stat==2 && flag==1 )//自然状态下调整湿度阈值
{
cnt++;
}
else if(key_value==4 && key_stat==2 && flag==1)//自然状态下调整湿度阈值
{
cnt--;
}
else if(key_value==6 && key_stat==2 && flag==1 )
{
flag=0;
}
}
}
//------------------------------------------
//--------------------------------------------
void main()
{
led_output();
ws_output();
Timer1Init();
DS1203_W();
while(1)
{
DS1302_R();
Change();
SMG_Display();
}
}
2、这是hardware.文件
#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 int timer10ms=0;
unsigned int timer100ms=0;
unsigned char led_buf=0xff;
unsigned char ws_buf=0x00;
unsigned char SMG_buf[]={0,8,17,3,0,16,0,0};
unsigned char key_stat=0;
unsigned char key_value=0;
//-----------------------------------------------
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()
{
SelectHC573(4);
P0=led_buf;
SelectHC573(0);
}
//----------------------------------
void ws_output()
{
SelectHC573(5);
P0=ws_buf;
SelectHC573(0);
}
//--------------------------------
void SMG_output()
{
static unsigned char SMG_com=0;
SelectHC573(6);
P0=0x00;
SelectHC573(0);
SelectHC573(6);
P0=T_COM[SMG_com];
SelectHC573(0);
SelectHC573(7);
P0=~t_display[SMG_buf[SMG_com]];
SelectHC573(0);
if(++SMG_com>=8)
{
SMG_com=0;
}
}
//------------------------------------------
void Timer1Init(void) //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
ET1=1;
EA=1;
}
//-----------------------------------------
void ServiceTimer () interrupt 3
{
SMG_output();
timer10ms++;
timer100ms++;
}
//-------------------------------------------
void Scankey()
{
P3|=0x0f;
if(~P3&0x0f)
{
if(key_stat<255)
key_stat++;
if(P33==0)
key_value=4;
if(P32==0)
key_value=5;
if(P31==0)
key_value=6;
if(P30==0)
key_value=7;
}
else
{
key_stat=0;
key_value=0;
}
}