Giao tiếp keyboard ps/2, pic, LCD

[vanhoan1]

// *****GIAO TIEP BAN PHIM VOI LCD***
// RS,RW,E POTRE
// LCD PORT B
// KEYPAD PORT D
//*************************************
#include "16F877A.h"
#include <DEFS_16f877a.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#byte portD=0x08
#byte portB=0x06
#byte portE=0x09
#define LCD portb
#define rs re0
#define rw re1
#define e re2
const unsigned char line[]= {'M','O','I',' ','N','H','A','P',' ','S','O',' ',':','#'};
INT8 b=0;
void lenh(void)
{output_low(pin_e0) ;
output_low(pin_e1);
output_high(pin_e2);
output_low(pin_e2);
delay_ms(6);}
void du_lieu(void)
{
output_high(pin_e0);
output_low(pin_e1);
output_high(pin_e2);
output_low(pin_e2);
delay_ms(6);}
void goi()
{b=0;
while(line[b]!='#')
     {
         output_b(line[b]);
         du_lieu();
         delay_ms(100);
         b++;
      }
}
void main()
{  set_tris_e(0);output_e(0);
   set_tris_b(0);output_b(0);
   OUTPUT_B(0X38);
   lenh();
   portb=0x0E;
   lenh(); 
   output_b(0x82);
   lenh();
   delay_ms(1);
   goi();  
   delay_ms(1);
   portb=0xc0;
   lenh();
   delay_ms(100);
   output_D(0b11111111);
   delay_ms(10);
   while(true)
   {
//====================================output_D(11111110)============//
      output_D(0b11111110);
      DELAY_MS(10);

         if( input(pin_D4)==0 )   
         {
         portb=0x37;      //ghi 7
         du_lieu();
         DELAY_MS(150);   
         }

         if( input(PIN_D5)==0 )    //cho khi D5 xuong 0
         {
         portb=0x38;      //ghi 8
         du_lieu();
         DELAY_MS(150);
         }

         if( input(PIN_D6)==0 )   //cho khi D6 xuong 0
         {
         portb=0x39;      //ghi 9
         du_lieu();
         DELAY_MS(150);
         }

         if( input(PIN_D7)==0 )    //cho khi D7 xuong 0
         {
         portb='A';      // ghi a
         du_lieu();
         DELAY_MS(150);
         }
//====================================output_D(11111101)=============//
         output_D(0b11111101);
         DELAY_MS(10);
         if( input(PIN_D4)==0 )   //cho khi D4 xuong 0
         {
         portb=0x34;      //ghi 4
         du_lieu();
         DELAY_MS(150);
         }
         if( input(PIN_D5)==0 )    //cho khi D5 xuong 0
         {
         portb=0x35;      //ghi 5
         du_lieu();
         DELAY_MS(150);
         }
         if( input(PIN_D6)==0 )    //cho khi D6 xuong 0
         {
         portb=0x36;      //ghi 6
         du_lieu();
         DELAY_MS(150);
         }
         if( input(PIN_D7)==0 )   //cho khi D7 xuong 0
         {
         portb='B';      //ghi b
         du_lieu();
         DELAY_MS(150);
         }
//======================output_D(11111011)==========================//
         output_D(0b11111011);
         DELAY_MS(10);
        if( input(PIN_D4)==0 )   //cho khi D4 xuong 0
         {
         portb=0x31;      //ghi 1
         du_lieu();
         DELAY_MS(150);
         }
         if( input(PIN_D5)==0 )    //cho khi D5 xuong 0
         {
         portb=0x32;      //ghi 2
         du_lieu();
         DELAY_MS(150);
         }
         if( input(PIN_D6)==0 )    //cho khi D6 xuong 0
         {
         portb=0x33;      //ghi 3
         du_lieu();
         DELAY_MS(150);
         }
         if( input(PIN_D7)==0 )   //cho khi D7 xuong 0
         {
         portb='C';      //ghi c
         du_lieu();
         DELAY_MS(150);
         }
//*******************************
         output_D(0b11110111);
         DELAY_MS(10);
         if( input(PIN_D4)==0 )   //cho khi D4 xuong 0
         {
         portb='*';      //ghi *
         du_lieu();
         DELAY_MS(150);
         }
         if( input(PIN_D5)==0 )    //cho khi D5 xuong 0
         {
         portb=0x30;      //ghi 0
         du_lieu();
         DELAY_MS(150);
         }
         if( input(PIN_D6)==0 )    //cho khi D6 xuong 0
         {
         portb=0X01;      //CLEAR
         LENH();
         portb=0x82;
         lenh();
         delay_ms(1);
         goi();
         delay_ms(1);
         portb=0xcf;
         lenh();
         portb=0x04;
         lenh();
         }                       
         if( input(PIN_D7)==0 )   //cho khi D7 xuong 0  
         {portb='D';      //ghi d
           du_lieu();   
           DELAY_MS(150);
         }
   }
}