giúp em cái code này

[hell1410]

#include<reg52.h>

// Khai bao 1 so chan dieu khien 74595 va 74154
sbit SCK=P1^0; // chan 11 cua 595
sbit STR=P1^1; // chan 12
sbit SDA=P1^2; // chan 14
sbit ctrl=P3^0; // dieu khien chan "Enable" cua 74154

/*-----------------------------------------------------------------------------------------------
Layer0
-----------------------------------------------------------------------------------------------*/
const unsigned char code cot[]=
{
/*-----------------------------------------------------------------------------------------------
Hexa C code for ledmatrix
Text content: "THANH HUNG"
Code generated by the LedTECHPAL software
Width x Height(pixels):100x16
Size of data: 208 (byte)
Position of region(X:Y):0:0
-----------------------------------------------------------------------------------------------*/
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xF7, 0x82, 0x3C, 0x7F, 0x78,
0x7B, 0xDE, 0xFE, 0x39, 0xE8, 0x00, 0x00, 0xD9, 0x63, 0x07, 0x0C, 0x26, 0x30, 0x31, 0x8C, 0x26,
0x13, 0x98, 0x00, 0x00, 0x18, 0x63, 0x07, 0x0E, 0x26, 0x30, 0x31, 0x8C, 0x27, 0x13, 0x08, 0x00,
0x00, 0x18, 0x63, 0x05, 0x0B, 0x26, 0x30, 0x31, 0x8C, 0x25, 0x96, 0x00, 0x00, 0x00, 0x18, 0x7F,
0x09, 0x89, 0xA7, 0xF0, 0x3F, 0x8C, 0x24, 0xD6, 0x3C, 0x00, 0x00, 0x18, 0x63, 0x0F, 0x89, 0xA6,
0x30, 0x31, 0x8C, 0x24, 0xD6, 0x18, 0x00, 0x00, 0x18, 0x63, 0x18, 0xC8, 0xE6, 0x30, 0x31, 0x8C,
0x24, 0x73, 0x18, 0x00, 0x00, 0x18, 0x63, 0x10, 0xC8, 0x66, 0x30, 0x31, 0x86, 0x64, 0x33, 0x98,
0x00, 0x00, 0x3C, 0xF7, 0xB9, 0xFC, 0x2F, 0x78, 0x7B, 0xC7, 0xCE, 0x10, 0xF8, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

};







void delay(int t) // ham tao tre
{
int a,b;
for(a=0;a<t;a++)
{
for(b=0;b<125;b++);
}
}


void quet(unsigned char d) // Ham xu ly 595-chuyen du lieu song song sang noi tiep
{
unsigned char i,t;
for(i=0;i<8;i++)
{
t=d&0x80;
if(t==0x80)
SDA=1;
else SDA=0;
d=d<<1;
SCK=0;
SCK=1;
}
}
unsigned char buffer(unsigned char x,unsigned char y,char i) // Ham xu ly du lieu hang
{
unsigned char temp;
temp=(x<<i)|(y>>(8-i));
return temp;
}
char i,j,k,m; // Khai bao cac bien quet led

void main()
{
P3=0x00;
while(1)
{
for(k=0;k<64-8;k++) // 64 la kich thuoc cot cua mang "cot",8 la so led matrix
{
for(i=0;i<8;i++) // Xu ly tung bit
{
for(j=0;j<10;j++) // vong lap tao tre
{
for(m=0;m<16;m++) // Quet tung hang
{
quet(buffer(cot[m*64+k+7],cot[m*64+k+8],i)); // Ma cho led 8
quet(buffer(cot[m*64+k+6],cot[m*64+k+7],i)); //Ma cho led 7
quet(buffer(cot[m*64+k+5],cot[m*64+k+6],i));
quet(buffer(cot[m*64+k+4],cot[m*64+k+5],i));
quet(buffer(cot[m*64+k+3],cot[m*64+k+4],i)); // "m*64": 64 la so cot cua mang
quet(buffer(cot[m*64+k+2],cot[m*64+k+3],i));
quet(buffer(cot[m*64+k+1],cot[m*64+k+2],i));
quet(buffer(cot[m*64+k],cot[m*64+k+1],i)); // Ma cho led 1
STR=0; // Xung chot 64bit du lieu
STR=1;
P2=m;
delay(2); // tre 1 khoang
ctrl=1; // Cam IC 74154
ctrl=0; // Cho phep IC 74154 hoat dong
}
}
}
}
}
}



câu lệnh này thấy kỳ kỳ
unsigned char buffer(unsigned char x,unsigned char y,char i) // Ham xu ly du lieu hang
{
unsigned char temp;
temp=(x<<i)|(y>>(8-i));
return temp;
}