Bài 2:LCD 16x2 8 bit kết hợp ma trận phím 4x4

CODE C

Các bạn chú ý biên dịch bằng phần mềm Keil C nhé.

/*****WWW.ChipKool.Net*****Simple Is The Best********/

#include "reg52.h"

#include "stdio.h"

sbit RS_LCD = P3^0;

sbit RW_LCD = P3^1;

sbit E_LCD = P3^2;

unsigned int i,a=0;

//---------------

void delay_short()

{

unsigned int i;

for(i=0;i<3;i++){} 

}

//--------------

void delay(unsigned int ms)// delay 1ms

{

unsigned int x,y;

for(x=0;x<ms;x++) {

for(y=0;y<125;y++) {

}

}

}

//--------------

void kt_ban(){

unsigned char x;

P2 = 0xff;

RS_LCD = 0;

RW_LCD = 1;

do {

E_LCD = 1;

delay_short();

E_LCD = 0;

x=P2;

x=x&0x80;

}

while(x!=0x80);

}

//----------------

void ghi_lenh(unsigned char commant){

kt_ban();

delay(50);

P2 = commant;

RS_LCD = 0; // chon thanh ghi lenh

RW_LCD = 0; // write to LCD

E_LCD = 1;

delay_short();

E_LCD = 0;

}

//-----------------

void ghi_kytu(unsigned char kytu){

kt_ban();

delay(30);

P2 = kytu;

RS_LCD = 1;

RW_LCD = 0;

E_LCD =1;

delay_short();

E_LCD = 0;

}

/*/------------------

void ghi_nhanh ( unsigned char kytu){

delay_short();

P1 = kytu;

RS_LCD = 1;

RW_LCD = 0;

E_LCD = 1;

delay_short();

E_LCD = 0;

}

*///-------------------

void ghi_chuoi(char *str){

while(*str){

ghi_kytu(*str);

str++;

}

}

/*/-------------------

void ghi_nhanh_chuoi(char *str){

while(*str){

ghi_nhanh(*str);

str++;

}

} */

//-------------------

void setting(){

ghi_lenh(0x38);

ghi_lenh(0x01); //Xoa man hinh

ghi_lenh(0x0f); //Co dich hien thi

ghi_lenh(0x0c); //Bat hien thi ,tat con tro

}

void hienthi()

{

if(P1==0xee){

a=1;

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 1");

}

if(P1==0xde){

a=2;

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 2");

}

if(P1==0xbe){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 3");

}

if(P1==0x7e){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 4");

}

if(P1==0xed){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 5");

}

if(P1==0xdd){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 6");

}

if(P1==0xbd){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 7");

}

if(P1==0x7d){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 8");

}

if(P1==0xeb){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 9");

}

if(P1==0xdb){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 10");

}

if(P1==0xbb){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 11");

}

if(P1==0x7b){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 12");

}

if(P1==0xe7){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 13");

}

if(P1==0xd7){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 14");

}

if(P1==0xb7){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 15");

}

if(P1==0x77){

ghi_lenh(0x01);

ghi_lenh(0x80+3);

ghi_chuoi("Phim so 16");

}

}

void quetphim(void)

{

int n[5] = {0xfe,0xfd,0xfb,0xf7};

for (i=0; i<5;i++) 

{

P1 = n[i];

hienthi();

}

}

void main()

{ setting();

ghi_lenh(0x01);

ghi_lenh(0x80);

ghi_chuoi("http://");

ghi_lenh(0xc0);

ghi_chuoi("www.Chipkool.net");

delay(300);

ghi_lenh(0x01);

ghi_lenh(0x80);

ghi_chuoi("Moi ban chon phim ??");

while(1)

{

quetphim();

}

}

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