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No displayin lcd 16x2 using with pic18f452 mcu

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Anand Kr. Singh

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At First,i have used pic16f877a every thing is working fine

code:

Code C - [expand]
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#include<16f877a.h>
#include<string.h>
 
 
#use delay(clock=4000000)
#fuses NOLVP,NOWDT,NOPROTECT,HS
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, BITS=8, PARITY=N,stream=PUMP,ERRORS) 
 
#bit   LCD_RS = 0x8.2   //RD2
#bit   LCD_RW = 0x8.0   //RD0
#bit   LCD_EN = 0x8.3   //RD3
 
#bit   RELAY1 = 0x5.0   //RA1
#bit   RELAY2 = 0x5.1   //RA2
#bit   RELAY3 = 0x5.2   //RA3
#bit   RELAY4 = 0x5.3   //RA4
 
#byte  LCD_DATA = 8   
#define LCD_STROBE()  (( LCD_EN = 1),(LCD_EN=0))
but now i have use pic18f452...but the lcd display is not show ..i thick there will be in declaration of hex...please help me. i m use ccs compiler and pickit2.

code for 18f452:

Code C - [expand]
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#include<18f452.h>
#include<string.h>
 
 
#use delay(clock=4000000)
#fuses NOLVP,NOWDT,NOPROTECT,HS
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, BITS=8, PARITY=N,stream=PUMP,ERRORS) 
//#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,BITS=8,PARITY=N,stream=PUMP,FORCE_SW,RESTART_WDT)
 
#bit   LCD_RS = 0x83.2 //PORTDbits.RD2   //RD2
#bit   LCD_RW = 0x83.0  //0xF83.0   //RD0
#bit   LCD_EN = 0x83.3 //0xF83.3   //RD3
 
#bit   RELAY1 = 0xF80.0   //RA1
#bit   RELAY2 = 0xF80.1   //RA2
#bit   RELAY3 = 0xF80.2   //RA3
#bit   RELAY4 = 0xF80.3   //RA4
 
#byte  LCD_DATA = 8   
#define LCD_STROBE()  (( LCD_EN = 1),(LCD_EN=0))

please reply soon....
 
Last edited by a moderator:

I don't understand your question. You have no actual code controlling the LCD, just some defines.
 

[Moved]Display problem with pic18f452

using Pic18f452 with mplab and proteus..
file and snap shot of proteus is attached Proteus.jpg

code:
Code: 
#include <P18f452.h>

#define ldata PORTD

#define rs PORTBbits.RB0
#define rw PORTBbits.RB1
#define en PORTBbits.RB2


void MSDelay(unsigned int itime);
void lcdcmd(unsigned char value);
void lcddata(unsigned char value);

void main()
{
 TRISD=0;
 TRISB=0;
 en=1;
 MSDelay(250);
 lcdcmd(0x38);
 MSDelay(250);
 lcdcmd(0x0E);
 MSDelay(15);
 lcdcmd(0x01);
 MSDelay(15);
 lcdcmd(0x06);
 MSDelay(15);
 lcdcmd(0x86);
 MSDelay(15);
 lcddata('M');
 MSDelay(15);
 lcddata('S');
while(1);
 }
 
 void lcdcmd(unsigned char value)
  {
   unsigned char ldata = value;
   rs = 0;
   rw =0 ;
   en = 1;
   MSDelay(1);
   en=0;
   }
   void lcddata(unsigned char value)
   {
   unsigned char ldata = value;
   rs = 1;
   rw =0 ;
   en = 1;
   MSDelay(1);
   en=0;
   }
   void MSDelay(unsigned int itime)
   { 
   unsigned int i,j;
    for(i=0;i<itime;i++)
       for(j=0;j<135;j++);
    }
 
Last edited by a moderator:

Besides other possible problems, your LCD-routines are for 8-bit interface, but you only connected 4 data lines. Can't work.
 

FvM said:
I don't understand your question. You have no actual code controlling the LCD, just some defines.
Click to expand...
i have but i think the main problem is with the defines...
..
ok
i will post the full code also..... this is working fine with pic16f877a...

Code: 
include<18f452.h>
#include<string.h>

#use delay(clock=4000000)
#fuses NOLVP,NOWDT,NOPROTECT,HS
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, BITS=8, PARITY=N,stream=PUMP,ERRORS) 
//#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,BITS=8,PARITY=N,stream=PUMP,FORCE_SW,RESTART_WDT)

#bit   LCD_RS = 0x8.2   //RD2
#bit   LCD_RW = 0x8.0   //RD0
#bit   LCD_EN = 0x8.3   //RD3

#bit   RELAY1 = 0x5.0   //RA1
#bit   RELAY2 = 0x5.1   //RA2
#bit   RELAY3 = 0x5.2   //RA3
#bit   RELAY4 = 0x5.3   //RA4

#byte  LCD_DATA = 8   
#define   LCD_STROBE()   ((LCD_EN = 1),(LCD_EN=0))

unsigned char buffer[35],response_flag = 0,Pulse_Count,ch,m,i,j;
int1 relay1_flag,int0_flag;
int16 UNITS;
int16 int_unit[5],t_unit,l_unit,r_unit;
unsigned char num[11];
//rb
//int16 uc1,uc2;
//unsigned int8 old_portb=0,port_b;
//int1 change,ca,ne;

void lcd_string(char * s);
void lcd_write(unsigned char c);
void lcd_clear(void);
void lcd_string(char * s);
void lcd_character(char c);
void lcd_char(unsigned char c);
void lcd_init();

void recharge();

void Read_response();
void char_inte(unsigned char a,b,c);

void send_cmgf(unsigned char *str);
void lcd_numdsply();
void clear_1stline();
void clear_2ndline();
void calc_units(int16 num);
void calc_rs(int16 num);
void get_unit(int16 unit[]);
void char_unit(unsigned char unit[]);

void TX_data(int16 no);

void rs_disp(unsigned int num );
 

unsigned char str22[16]="---WELCOME TO--";
unsigned char str23[17]="NOC Meter";


#INT_EXT
void Pulse_isr()
{
   Pulse_Count++;
   
   if(Pulse_Count == 16)//in place of 10 unit change on 18-7-2014 -32 in naturetech
   {
      Pulse_Count++;
      int0_flag = 1;
      Pulse_Count = 0;
      UNITS++;
   }
}
void calc_units(int16 num)
{  
  int16 unit_buff[5],x1,x2,x3,x4;
   x1 = num/100;
   x1 = x1+0x30;
   unit_buff[1] = x1;
   
 num = num%100;
   num = num*10;
   x2 = num/100;
   x2 = x2+0x30;
   unit_buff[2] = x2;

   num = num%100;
   num = num*10;
   x3 = num/100;
   x3 = x3+0x30;
   unit_buff[3] = x3;
   
   num = num%100;
   num = num*10;
   x4 = num/100;
   x4 = x4+0x30;
   unit_buff[4] = x4;
  
   lcd_char(unit_buff[1]);
   lcd_char(unit_buff[2]);
   lcd_char(unit_buff[3]);
   lcd_char(unit_buff[4]);
   lcd_char(' ');
}
void char_inte(unsigned char a,b,c)
{
unsigned char new[3];
new[0]=a;
new[1]=b;
new[2]=c;
for(int i=0;i<3;i++)//for reading the buffer unit and save it to int
{
if(new[i]=='1')
   int_unit[i]=1;
   
if(new[i]=='2')
   int_unit[i]=2;
   
if(new[i]=='3')
   int_unit[i]=3;
   
if(new[i]=='4')
   int_unit[i]=4;
   
if(new[i]=='5')
   int_unit[i]=5;
   
if(new[i]=='6')
   int_unit[i]=6;
   
if(new[i]=='7')
   int_unit[i]=7;
   
if(new[i]=='8')
   int_unit[i]=8;
   
if(new[i]=='9')
   int_unit[i]=9;
   
if(new[i]=='0')
   int_unit[i]=0;
}
int16 a1=0,b1=0,c1=0;
 a1=int_unit[0] * 100;
   b1=int_unit[1] * 10;
   c1=int_unit[2];
   a1= a1+b1+c1;
   r_unit=a1;      
}

void calc_rs(int16 num)
{
   int16 unit_buff[4],x1,x2,x3;
   x1 = num/100;
   x1 = x1+0x30;
   unit_buff[1] = x1;
   
 num = num%100;
   num = num*10;
   x2 = num/100;
   x2 = x2+0x30;
   unit_buff[2] = x2;

   num = num%100;
   num = num*10;
   x3 = num/100;
   x3 = x3+0x30;
   unit_buff[3] = x3;

   lcd_char(unit_buff[1]);
   lcd_char(unit_buff[2]);
   lcd_char(unit_buff[3]);
}

void main()
{
   set_tris_d(0x00);
   set_tris_a(0x00);
   set_tris_c(0x80);
   
   Pulse_Count = 0;
   UNITS = 0;
   r_unit=0;
   t_unit=0;
   l_unit=0;
    lcd_init(); 
      
   
   enable_interrupts(GLOBAL);
   enable_interrupts(INT_EXT);
   ext_int_edge(H_TO_L);

lcd_clear();
   lcd_write(0x80);
   lcd_string(str22);
   lcd_write(0xc0);
   lcd_string(str23);

 while(TRUE)
 {
       lcd_clear();        
             calc_rs(UNITS);
            delay_ms(2000);
            
   }
}



void send_cmgf(unsigned char *str)
{
  //unsigned char t;
    while(*str!='\0')
{
   putchar(*str);
        str++;
}
  putchar(0x0d);
while(getchar()!='K');
   
}


void lcd_write(unsigned char c)
{
   delay_us(40);
   LCD_DATA = ((c & 0xf0));
   LCD_STROBE();
   LCD_DATA = ( ( c << 4 ) & 0xf0 );
   LCD_STROBE();
}
void lcd_char(unsigned char c)
{
   delay_us(40);
   LCD_DATA = ((c & 0xf0));
   LCD_RS = 1;
   LCD_STROBE();
   LCD_DATA = ( ( c << 4 ) & 0xf0 );
   LCD_RS = 1;
   LCD_STROBE();
}
void clear_1stline()
{
   lcd_write(0x80);
   for(m=0;m<16;m++)
   {
      lcd_char(' ');
   }
}
void clear_2ndline()
{
   lcd_write(0xc0);
   for(m=0;m<16;m++)
   {
      lcd_char(' ');
   }
}

void lcd_clear(void)
{
   LCD_RS = 0;
   lcd_write(0x01);
   delay_ms(2);
}

/* write a string of chars to the LCD */

void lcd_string(char * s)
{
   LCD_RS = 1;   // write characters
   while(*s)
      lcd_char(*s++);
}

/* write one character to the LCD */

void lcd_character(char c)
{
   LCD_RS = 1;   // write characters
   lcd_char( c );
}
void lcd_init()
{
   char init_value;

//   ADCON1 = 0x06;   // Disable analog pins on PORTA

   init_value = 0x30; //0x03;
   set_tris_a(0x00);
   set_tris_d(0x00);
   LCD_RS = 0;
   LCD_EN = 0;
   LCD_RW = 0;
   
   delay_ms(15);   // wait 15mSec after power applied,
   LCD_DATA = init_value;
   LCD_STROBE();
   delay_ms(5);
   LCD_STROBE();
   delay_us(200);
   LCD_STROBE();
   delay_us(200);
   LCD_DATA = 0x20; //0x02;   // Four bit mode
   LCD_STROBE();

   lcd_write(0x28); // Set interface length
   lcd_write(0x0c); // Display On, Cursor On, Cursor Blink
   lcd_clear();   // Clear screen
   lcd_write(0x06); // Set entry Mode
}




void recharge()
{
if(t_unit > 0)
        {
            RELAY1 = 0;              //on while recharge
             relay1_flag = 1;
             clear_1stline();
   lcd_write(0x80);
  
    lcd_write(0x89);
   calc_rs(t_unit);
         } 
}
 
Last edited by a moderator:

You are posting completely different LCD routines now. Do you understand the difference regarding interface bit width?
 

FvM said:
You are posting completely different LCD routines now. Do you understand the difference regarding interface bit width?
Click to expand...

the 1st example ....i have also tried but not work..:-(

last one is the full code i have tiring to solve the display problem.
 

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