书上直流电机驱动代码

#include<reg52.h>
#define uchar unsigned char

sbit dula=P2^6;
sbit wela=P2^7;
sbit dianji=P1^7;
sbit jia_key=P3^6;
sbit jian_key=P3^7;

uchar num=0,show_num=1,gao_num=1,di_num=3;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void delay(uchar i)
{
    uchar j,k;
    for(j=i;j>0;j--)
    for(k=124;k>0;k--);
}

void display()
{
    dula=0;
    P0=table[show_num];
    dula=1;
    dula=0;
    wela=0;
    P0=0xfe;
    wela=1;
    wela=0;
    delay(5);
    P0=table[0];
    dula=1;
    dula=0;
    P0=0xfd;
    wela=1;
    wela=0;
    delay(5);
    P0=table[0];
    dula=1;
    dula=0;
    P0=0xfb;
    wela=1;
    wela=0;
    delay(5);
    P0=table[0];
    dula=1;
    dula=0;
    P0=0xf7;
    wela=1;
    wela=0;
    delay(5);
}

void key()
{
    if(jia_key==0)
    {
    delay(5);
    if(jia_key==0)
    {
        num++;
     if(num==4)
        num=3;
     while(jia_key==0);
    }
    }

    if(jian_key==0)
    {
    delay(5);
    if(jian_key==0)
    {
     if(num!=0)
           num--;
     else
           num=0;
     while(jian_key==0);
    }
    }
}

void dispose()
{
    switch(num)
    {
    case 0:
        show_num=1;
        gao_num=1;
        di_num=3;
        break;
    case 1:
        show_num=2;
        gao_num=2;
        di_num=2;
        break;
    case 2:
        show_num=3;
        gao_num=3;
        di_num=1;
        break;
    case 3:
        show_num=4;
        gao_num=4;
        di_num=0;
        break;
    }
}

void qudong()
{
    uchar i;
    if(di_num!=0)
    {
    for(i=0;i<di_num;i++)
    {
        dianji=0;
        display();
    }
    }
    for(i=0;i<gao_num;i++)
    {
    dianji=1;
    display();
    }
}

void main()
{
    while(1)
    {
    dianji=0;
    key();
    dispose();
    qudong();
    }
}