CHỦ ĐỀ TUẦN 3: LCD 16*2 (cùng giải thích các câu lệnh LCD)

**Admin** Tue Jun 16, 2009 12:57 pm

#include <16F877A.h>
#include <DEFS_16F877A.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#define RS RD0
#define RW RD1
#define E RD2
#define LCD PORTB

/*Ham yeu cau goi lenh dieu khien LCD*/
void comnwrt(void)
{
RS = 0; //ghi lenh
RW = 0; //LCD o che do ghi
E = 1; //ghi du lieu (high-to-low transition)
E = 0;
delay_ms(1);
}
/*Ham yeu cau goi du lieu hien thi len LCD*/
void datawrt(void)
{
RS = 1; //ghi du lieu
RW = 0;
E = 1;
E = 0;
delay_ms(1);
}
/*Ham main*/
void main(void)
{
set_tris_B(0); //chon port B la ngo ra
set_tris_D(0);
delay_ms(100); // Tao tre 100ms cho LCD khoi dong

LCD = 0x38; //Function set
// DBx = 0 0 1 [DL] [N] [F] * *---------DL=1 8bit, N=1 hien thi 2 hang, F=0 5*7 diem anh
comnwrt();
LCD = 0x0C; // Display on/off control:
// DBx = 0 0 0 0 1 [D] [C] [B]----------D=1 hiren thi nam hinh,C=1 hien thi con tro,B=1 NHAP NHAY KY TU TAI VI TRI CON TRO
comnwrt();

LCD = 0x85; // Vi tri hang 1,cot 6
comnwrt();

LCD = 'B'; // Xuat dong chu "BE YEU" ra LCD
datawrt();
LCD = 'E';
datawrt();
LCD = ' ';
datawrt();
LCD = 'Y';
datawrt();
LCD = 'E';
datawrt();
LCD = 'U';
datawrt();
LCD = '!';
datawrt();
}