#include <REG52.H>

/* Cot tu P1.0 den 1.7

Hang tu P2.0 den P3.7

De quet dua muc logic 0 lan luot ra cong 0

*/

/* Ham tre */

void delay(long time)

{

long n;

for(n=0;n<time;n++)

{

;

}

}

unsigned char kytu1[23]={0x00,0x81,0x81,0x0FF,0x81,0x81,0x0C,0x3E,0x7F,0x7E,0x0FC,0x7C,0x3E,0x1F,0x0E,0x00,0xFF,0x80,0x80,0x80,0xFF,0x00,0x00};

unsigned char k=0;

/* Ham quet led ma tran_ vua hien thi vua dich ky tu dan sang trai*/

void hienthi(void)

{

unsigned char n,k,lap;

unsigned char cot[8]={0xFE,0xFD,0xFB,0xF7,0xEF,0xDF,0xBF,0x7F};

for(k=0;k<16;k++)

{ 

for(lap=0;lap<15;lap ++) 

{for(n=0;n<8;n++)

{

if((n+k)<50 )

{P0=cot[n]; 

P2=kytu1[n+k];

delay(45);

}

P0=0xFF;

P2=0x00;

} }

}

}

void main(void)

{

while(1)

{

hienthi();

k=k+1; 

if(k==27) k=0;

}

}