xin hỏi ý tưởng viết code này

**tdm** · 31-08-2011, 02:30 PM

Trích:

Nguyên văn bởi levuphuong

hom nay em làm tiếp tới lcd nhưng sao nó hok chạy
http://www.picvietnam.com/forum//sho...0&postcount=51
làm theo code này và chan em nối
1;gnd
2;vcc
3;chia ap ra 2.5v câu vào
4,5,6 d0->d2
7.8.9.10.11.12.13.14.
15 len vcc
16 đất
nhưng sao em nạp vào nó chỉ sáng chứ hok ra chữ
em đổi xt->hs rồi dùng
#use delay(clock=12000000)
Các bác cho hỏi em làm như thế đúng chưa

thử lại xem sao:

Code:

/*-----------------------------------------------------------------------------
* Author          : nhh
* Date            : 05/04/06
* Hardware        : PIC16F877A
* Compiler      : CCS C 3.249
* Description  : Hien thi LCD
*=============================================================================*/
#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

const unsigned char key[]="HELLOPICVIETNAM!";
int i = 0;

/*Ham yeu cau goi lenh dieu khien LCD*/
void comnwrt(void)
{
 RS = 0;
 RW = 0;
 E  = 1;
delay_ms(1);
 E  = 0;
 delay_ms(1);
}
/*Ham yeu cau goi du lieu hien thi len LCD*/
void datawrt(void)
{
 RS = 1;
 RW = 0;
 E  = 1;
delay_ms(1);
 E  = 0;
 delay_ms(1);
}
/*Ham main*/
void main(void)
{
 set_tris_B(0);
 set_tris_D(0);
 delay_ms(100);   //   Tao tre 100ms cho LCD khoi dong

 LCD = 0x38;      //   Hai hang, ma tran dot 5*7, 8 bit interface
 comnwrt();
 LCD = 0x0C;      //   Bat hien thi, tat con tro
 comnwrt();
 LCD = 0x86;      //   Vi tri hang 1,cot 7
 comnwrt();
 while(true)
   {
       LCD = key[i];
       datawrt();
       delay_ms(100);
       i++;
       if(i==5)               //   Hien thi xong HELLO
         {
            LCD = 0xC3;       //   Vi tri hang 2,cot 4
            comnwrt();
            delay_ms(100);
         }
       if(i==16)              //   Hien thi xong PICVIETNAM!
         {
            delay_ms(1100);
            LCD = 0x01;       //   Xoa man hinh hien thi
            comnwrt();
            delay_ms(500);
            LCD = 0x86;       //   Vi tri hang 1,cot 7
            comnwrt();
            i = 0;
         }
   }
}