单片机点阵问题 求大神来解决

#include <reg51.h>
#include<intrins.h>
sbit R_CLK=P3^5;
sbit S_CLK=P3^6;
sbit SER=P3^4;
void send(unsigned char dat);
void out();
void delay(unsigned int i);
void sendtwo(unsigned char dat1,unsigned char dat2);
//unsigned char code lie[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
//unsigned char code hang[]={0xef,0xcf,0xaf,0xef,0xef,0xef,0xef,0x83};
//unsigned char segout[8]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; //8列
//unsigned char code tab[]={
// 0x00,0x6C,0x92,0x82,0x44,0x28,0x10,0x00
// };
void main()
{
while(1)
{
P0=0x80; //行选
send(0x7f); //列选
out();
}
}
void send(unsigned char dat)
{
unsigned char i;
for(i=0;i<8;i++)
{
S_CLK=0;
SER=dat&0x80;
dat<<=1;
S_CLK=1;
}
}
void sendtwo(unsigned char dat1,unsigned char dat2)
{
send(dat1);
send(dat2);
}
void out()
{
R_CLK=0;
_nop_();
R_CLK=1;
}
void delay(unsigned int i)
{
while(i--);
}