求高手帮我解释一下这个程序。。。。谢谢

只看该作者 · 2012-12-16 09:27

#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
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 DelayMS(uint ms)
{
uchar i;
while(ms--)
{
     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];
DelayMS(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];
DelayMS(25);
}
}
}

void main()
{
uchar N = 3;
while(1)
{
     if(K1 == 0)
{
     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;
}
}
}