按键程序

文天祥10天学会单片机系列

#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit key1=P3^4;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0};
uchar num,temp,num1;
void delay(uint z)
{
    uint x,y;
    for(x=z;x>0;x--)
        for(y=110;y>0;y--);
}
uchar keyscan();
void display(uchar aa);
void main()
{
    num=17;
    dula=1;
    P0=0;
    dula=0;
    wela=1;
    P0=0xc0;
    wela=0;
    
    while(1)
        {
            display(keyscan());
        }
}
void display(uchar aa)//数码管显示函数
{
            dula=1;
            P0=table[aa-1];
            dula=0;     
}
uchar keyscan()//键盘函数
{
            P3=0xfe;
            temp=P3;
            temp=temp&0xf0;//判断高四位是否按下
            while(temp!=0xf0)//此为有按键被按下
                {
                    delay(5);
                    temp=P3;
                    temp=temp&0xf0;//确定高四位有按键按下
                    while(temp!=0xf0)
                    {
                        temp=P3;
                    switch(temp)//判断哪个按键根据第四位
                        {
                            case 0xee:num=1;
                                break;
                            case 0xde:num=2;
                                break;
                            case 0xbe:num=3;
                                break;
                            case 0x7e:num=4;
                                break;
                        }
                    while(temp!=0xf0)//确定按键已经结束
                        {
                            temp=P3;
                            temp=temp&0xf0;
                        }
                    }
                }

            P3=0xfd;
            temp=P3;
            temp=temp&0xf0;
            while(temp!=0xf0)
                {
                    delay(5);
                    temp=P3;
                    temp=temp&0xf0;
                    while(temp!=0xf0)
                    {
                        temp=P3;
                    switch(temp)
                        {
                            case 0xed:num=5;
                                break;
                            case 0xdd:num=6;
                                break;
                            case 0xbd:num=7;
                                break;
                            case 0x7d:num=8;
                                break;
                        }
                    while(temp!=0xf0)
                        {
                            temp=P3;
                            temp=temp&0xf0;
                        }
                    }
                }


            P3=0xfb;
            temp=P3;
            temp=temp&0xf0;
            while(temp!=0xf0)
                {
                    delay(5);
                    temp=P3;
                    temp=temp&0xf0;
                    while(temp!=0xf0)
                    {
                        temp=P3;
                    switch(temp)
                        {
                            case 0xeb:num=9;
                                break;
                            case 0xdb:num=10;
                                break;
                            case 0xbb:num=11;
                                break;
                            case 0x7b:num=12;
                                break;
                        }
                    while(temp!=0xf0)
                        {
                            temp=P3;
                            temp=temp&0xf0;
                        }
                    }
                }


            P3=0xf7;
            temp=P3;
            temp=temp&0xf0;
            while(temp!=0xf0)
                {
                    delay(5);
                    temp=P3;
                    temp=temp&0xf0;
                    while(temp!=0xf0)
                    {
                        temp=P3;
                    switch(temp)
                        {
                            case 0xe7:num=13;
                                break;
                            case 0xd7:num=14;
                                break;
                            case 0xb7:num=15;
                                break;
                            case 0x77:num=16;
                                break;
                        }
                    while(temp!=0xf0)
                        {
                            temp=P3;
                            temp=temp&0xf0;
                        }
                    }
                }
return num;

}//重复switch-case语句是确定是哪个按键即case语句的不同来确定1-16

/*****************另一个程序********************/
//用数码管前两位显示十进制数，范围00-59开始时显示00，之后没按S2数值加1；按S3数值减1；按S4数值归零；按S5定时器自动每秒加1，
//再按一次数值停止并自动加1，保持显示原数
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit key1=P3^4;
sbit key2=P3^5;
sbit key3=P3^6;
sbit key4=P3^7;
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,
};
void delayms(uint xms);
uchar numt0,num;
void display(uchar numdis)
{
    uchar shi,ge;
    shi=numdis/10;
    ge=numdis%10;
    
    dula=1;
    P0=table[shi];
    dula=0;
    P0=0xff;//要注意防止数据有差错
    wela=1;
    P0=0xfe;
    wela=0;
    delayms(5);
    
    dula=1;
    P0=table[ge];
    dula=0;
    P0=0xff;
    wela=1;
    P0=0xfd;
    wela=0;
    delayms(5);
}

void delayms(uint xms)
{
    int i,j;
    for(i=xms;i>0;i--)
        for(j=110;j>0;j--);
}

void init()
{
    TMOD=0x01;//定时器0工作方式1
    TH0=(65536-45872)/256;
    TL0=(65536-45872)%256;
    EA=1;
    ET0=1;
}

void keyscan()
{
    if(key1==0)
    {
        delayms(10);
        if(key1==0)
        {
            num++;
            if(num==60)
                num=0;
            while(!key1);//等待按键释放
        }
    }
    if(key2==0)
    {
        delayms(10);
        if(key2==0)
        {
            if(num==0)
                num=60;
            num--;
            while(!key2);
        }
    }
    if(key3==0)
    {
        delayms(10);
        if(key3==0)
        {
            num=0;
            while(!key3);
        }
    }
    if(key4==0)
    {
        delayms(10);
        if(key4==0)
        {
            while(!key4);
            TR0=~TR0;
        }
    }
}

void main()
{
    init();
    while(1)
    {
        keyscan();
        display(num);
    }
}
void T0_time()interrupt 1
{
    TH0=(65536-45872)/256;
    TL0=(65536-45872)%256;
    numt0++;
    if(numt0==20)
    {
        numt0=0;
        num++;
        if(num==60)
            num=0;
    }
}