#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int


uchar code FFW[] = {0x01,0x03,0x02,0x06,0x04,0x0C,0x08,0x09};
uchar code REV[] = {0x09,0x08,0x0C,0x04,0x06,0x02,0x03,0x01};

sbit K1 = P3^0;
sbit K2 = P3^1;
sbit K3 = P3^2;


void delay(uint x)
{
    uchar i;
    while(x--) for(i=0;i<120;i++);
}


void SETP_MOTOR_FFW(uchar n)
{
    uchar i,j;
    for(i=0;i<5*n;i++);
    {
        for(j=0;j<8;j++)
        {
            if(K3 == 0) break;
            P1 = FFW[j];
                delay(25);
                }
    }
}

void SETP_MOTOR_REV(uchar n)
{
    uchar i,j;
    for(i = 0;i<5*n;i++)
    {
        for(j=0;j<8;j++)
        {
            if(K3 == 0) break;
            P1 = REV[j];
            delay(25);
        }
    }
}

void main()
{
    uchar N = 6;uchar r;
    while(1)
    {
        if(K1 == 0)
        {
            for(r=0;r<N;r++)
            {
            P0 = 0xFE;
            SETP_MOTOR_FFW(N);
            if(K3 == 0) break;
            }
        }
        else if(K2 == 0)
        {
            P0 = 0xFD;
            SETP_MOTOR_REV(N);
            if(K3 == 0) break;
        }
        else
        {
            P0 = 0xFB;
            P1 = 0x03;
        }
    }
}