刚注册发现论坛要激活，想做个stm32的东西，可快递都放假了，没办法，手头没东西，就随便发一个吧，这个是去年这个时候帮别人写的，大概就是四个按键控制单片机，按一下按键点亮一个对应led，再按一下灯灭，其中一个按亮灯后，再按其他按键灯灭，然后长按其他按键单片机重启，各位可能觉得没什么难度，当时刚学，写的时候里面的逻辑挺绕的，所以就发这个吧

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
#define ulong unsigned long

typedef struct key
{
    uchar key1;
    uchar key2;
    uchar key3;
    ulong flag;
    uchar count;
} keycon;

keycon keyarray[8];

ulong n,at,m;

void inittimer0(void);
void delay(uint);
void init(keycon * );
uchar scankeys(void);
void openled(keycon * ,uchar);
void doled(keycon * );
void ledtoled(keycon * ,uchar);
//void closetimer1(void);
//void inittimer1(void);

void main()
{    
    uchar i,j;
    init(keyarray);
    inittimer0();
    P3=0xff;
    j=9;
    while(P3!=0xff);
    while(1)
    {
        j=scankeys();
        if(j<8)
        {
            openled(keyarray,j);
        }

        while(P3!=0xff);
        while(P3==0xff)
        {
            for(i=0;i<8;i++)
            {
    
                if((keyarray[i].flag)<n)
                {
                    ledtoled(keyarray,i);
                }
                at&=keyarray[i].flag;
            }
            if(at==0xffff)
                n=0;            
        }
    }
}

uchar scankeys()
{
    uchar keys;
    if(P3!=0xff)
    {
        delay(5);
        if(P3!=0xff)
        {
            keys=P3;
            switch(keys)
            {
                case 0xfe : return 0 ; break ;
                case 0xfd : return 1 ; break ;
                case 0xfb : return 2 ; break ;
                case 0xf7 : return 3 ; break ;
                case 0xef : return 4 ; break ;
                case 0xdf : return 5 ; break ;
                case 0xbf : return 6 ; break ;
                case 0x7f : return 7 ;
                
            }
        }
    }
    else
        return 9;
}

void delay(uint z)
{
    uint x,y;
    for(x=z;x>0;x--)
        for(y=110;y>0;y--);    
}

void inittimer0()
{
    TMOD=0x01;
    TH0=(65535-60000)/256;
    TL0=(65535-60000)%256;
    EA=1;
    ET0=1;
    TR0=1;
}
/*
void inittimer1()
{
    TMOD=0x01;
    TH1=(65535-50000)/256;
    TL1=(65535-50000)%256;
    EA=1;
    ET1=1;
    TR1=1;
    m=0;
}
*/
void timer0() interrupt 1
{
    TH0=5535/256;
    TL0=5535%256;
    n++;
}
/*
void closetimer1()
{
    TR1=0;
}

void timer1() interrupt 3
{
    TH1=(65535-50000)/256;
    TL1=(65535-50000)%256;
    m++;
}
*/
void init(keycon * keyarray)
{
    uchar pio1,pio2,poi;
    uchar i;
    pio1=0xff;
    pio2=0xff;
    poi=0xfe;
    for(i=0;i<8;i++)
    {
        keyarray[i].key1=pio1;
        keyarray[i].key2=pio2;
        keyarray[i].key3=poi;
        keyarray[i].count=0;
        keyarray[i].flag=0xffff;
        poi=(poi<<1)|1;

    }
    doled(keyarray);
}

void openled(keycon * keyarray,uchar i)
{
    keyarray[i].flag=1000+n;
    keyarray[i].count++;

    if(keyarray[i].count==2)
    {
/*        if((P3!=0xff)&&(keyarray[i].flag>n))
        {
            inittimer1();
        }
        while(P3!=0xff);
        closetimer1();
        if(m>=20)    */
        {
        //    (*(void(*)()) 0x0000)();
            (*(void (*)())0x000)();
        }
    }

    else
    {
        keyarray[i].key1=keyarray[i].key3;        
        keyarray[i].key2=0xff;
    }
    doled(keyarray);
}

void doled(keycon * keyarray)
{
    uchar temp1,temp2;
    uchar i;
    temp1=0xff;
    temp2=0xff;
    for(i=0;i<8;i++)
    {
        temp1=temp1&keyarray[i].key1;
        temp2=temp2&keyarray[i].key2;
    }
    P1=temp1;
    P2=temp2;
}

void ledtoled(keycon * keyarray,uchar i)
{
//    if(keyarray[i].flag<n)
    {
        keyarray[i].flag=0xffff;
        keyarray[i].count=1;
        keyarray[i].key1=0xff;
        keyarray[i].key2=keyarray[i].key3;
    }
    doled(keyarray);
}