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lcd 16*2 driver

 
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pkipyy



Joined: 21 Nov 2013
Posts: 25

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lcd 16*2 driver
PostPosted: Sat Nov 30, 2013 7:26 am     Reply with quote

This is lcd driver for demo2 plus board.
If you a bit modify,you can use this.

Code:



// As defined in the following structure the pin connection is as follows:
//     D0  enable RD6
//     D1  rs  RD4
//     D2  rw  RD5
//     D4  D4 RD0
//     D5  D5 RD1
//     D6  D6 RD2
//     D7  D7 RD3
struct lcd_pin_map {                 // This structure is overlayed
           boolean rd0;
           boolean rd1;
           boolean rd2;
           boolean rd3;
           boolean rs;
           boolean rw;
           boolean en;           // on to an I/O port to gain
           boolean pwr;           // low order up.  ENABLE will
        } lcd;
struct lcd_pin_map trisd;
struct lcd_pin_map latd;

#byte lcd = 0x0f //PORTD
#byte trisd = 0x8f
#byte latd = 0x10f

#define INP 1
#define OUTP 0

#define ENABLE 1
#define DISABLE 0
#define READ 1
#define WRITE 0
#define CLEAR 0
#define SET 1
#define MAX_LINE 2
#define MAX_COL 16
void nop()
{
}
char read_byte()
{
   int res,dat;
   trisd.rd0=INP;
   trisd.rd1=INP;
   trisd.rd2=INP;
   trisd.rd3=INP;
   
   lcd.en=ENABLE;
   nop();
   nop();
   dat=latd;
   lcd.en=DISABLE;
   res=dat<<4;

   lcd.en=ENABLE;
   nop();
   nop();
   dat=latd;
   dat=dat&0x0f;
   res=res|dat;
   
   trisd.rd0=OUTP;
   trisd.rd1=OUTP;
   trisd.rd2=OUTP;
   trisd.rd3=OUTP;
   return res;
}
void wait_lcd()
{
   char status;
   lcd.rs=CLEAR;
   lcd.rw=READ;

   do{
      status=read_byte();
   }while(status&0x80);
}
   
void write_nibble(char cmd,char dat)
{
   char buf;
   if(cmd) lcd.rs=CLEAR;
   else lcd.rs=SET;
   lcd.rw=WRITE;
   lcd.en=ENABLE;
   buf=latd;
   buf=buf &0xf0;
   latd=buf |(dat&0x0f);
   nop();
   nop();
   lcd.en=DISABLE;
}
void write_byte(char cmd,char dat)
{
   write_nibble(cmd,dat>>4);
   write_nibble(cmd,dat);
}
void lcd_put_char(char dat)
{
   write_byte(FALSE,dat);
   wait_lcd();
}
void lcd_put_str(str[])
{
   int i=0;
   while(str[i])
      lcd_put_char(str[i++]);
}   
void lcd_goto(char line,char col)
{
   if((line >MAX_LINE-1)||(col>MAX_COL-1))  return;
   if(line==1) write_byte(TRUE,0xc0|col);
   if(line==0) write_byte(TRUE,0x80|col);
   wait_lcd();
}
void lcd_clear()
{
   write_byte(TRUE,0x01);
   wait_lcd();
}
void init_lcd()
{
   trisd=0;
   lcd.pwr=0;
   lcd.pwr=1;
   lcd.rs=CLEAR;
   lcd.rw=WRITE;
   lcd.en=DISABLE;
   lcd.en=ENABLE;
   
   wait_lcd();
   write_nibble(TRUE,0x02);
   wait_lcd();
   write_byte(TRUE,0x28);
   wait_lcd();
   write_byte(TRUE,0x01);
   wait_lcd();
   write_byte(TRUE,0x02);
   wait_lcd();
   write_byte(TRUE,0x0c);
   wait_lcd();

   wait_lcd();
}



Here is test program
Code:

#include <16f1937.h>
#include "lcd.c"
#use delay(clock = 500000)



void main()
{
   init_lcd();

   while(1) {
      lcd_goto(0,0);
      lcd_put_char("a");
   }
}



Happy to you.
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