configuration setting?

[haowhaow]

im newbie in programming.....
im using hi tech compiler, pic18f4520 and 16 x 2 lcd.....
after simulation is ok....but in real device, my lcd is blank .....
i dunno how to configure my code.....can anyone here helps me to solve it??


here is my code:

#include <htc.h>
#include <math.h>


#include "lcd.h"
__CONFIG(1, FCMDIS & IESODIS & HS);
__CONFIG(2, BORDIS & BORV45 & PWRTEN & WDTDIS & WDTPS1);
__CONFIG(3, CCP2RB3 & LPT1DIS & MCLRDIS & 0xFDFF);
__CONFIG(4, DEBUGDIS & XINSTDIS & LVPDIS & STVRDIS);


//Simple Delay Routine
void Wait(unsigned int delay)
{
for(;delay;delay--)
__delay_us(100);
}
void ADCInit(void){
ADCON0=0b00000001;	// select Fosc/2
ADCON1=0b00001110;	// select left justify result. A/D port configuration 0
ADCON2=0b00001010;
}
unsigned char read_adc(unsigned char ){
ADON = 1;	// initiate conversion on the selected channel
GODONE=1 ;//Start conversion
while(GODONE= 1)continue;
return(ADRESH);	// return 8 MSB of the result
}
void main()
{
//Let the LCD Module start up
Wait(100);

//Initialize the LCD Module
LCDInit(LS_BLINK);

//Initialize the ADC Module
ADCInit();

//Clear the Module
LCDClear();

//Write a string at current cursor pos
LCDWriteString("Temperature:");
LCDWriteStringXY(5,1,"Degree C");


while(1)
{
unsigned int val;
unsigned int t;	 //Temperature

val=read_adc(); //Read Channel 0

t=round(((val*5000)/1024)/10);

LCDWriteIntXY(0,1,t,3);//Prit IT!


Wait(1000);

}	
}

 

[blueroomelectronics]

Add decoupling caps for starters.

 

[be80be]

Post your LCD.h file

 

[haowhaow]

Post your LCD.h file

my LCD.H file as shown

#include <htc.h>

#define _XTAL_FREQ 20000000UL

#include "myutils.h"


#ifndef _LCD_H
#define _LCD_H

#define FOURBIT_MODE    0x0
#define EIGHTBIT_MODE    0x1

typedef unsigned char uint8_t;

/*_________________________________________________________________________________________*/

/************************************************
    LCD CONNECTIONS
*************************************************/

#define LCD_DATA D    //Port PD0-PD3 are connected to D4-D7

#define LCD_E D     //Enable/strobe signal
#define LCD_E_POS    4    //Position of enable in above port

#define LCD_RS B    
#define LCD_RS_POS 1

#define LCD_RW B
#define LCD_RW_POS 2


//************************************************

#define LS_BLINK 0B00000001
#define LS_ULINE 0B00000010



/***************************************************
            F U N C T I O N S
****************************************************/

void LCDInit(uint8_t style);
void LCDWriteString(const char *msg);
void LCDWriteInt(int val,unsigned int field_length);
void LCDGotoXY(uint8_t x,uint8_t y);

//Low level
void LCDByte(uint8_t,uint8_t);
#define LCDCmd(c) (LCDByte(c,0))
#define LCDData(d) (LCDByte(d,1))

void LCDBusyLoop();



/***************************************************
            F U N C T I O N S     E N D
****************************************************/


/***************************************************
    M A C R O S
***************************************************/
#define LCDClear() LCDCmd(0b00000001)
#define LCDHome() LCDCmd(0b00000010)

#define LCDWriteStringXY(x,y,msg) {\
 LCDGotoXY(x,y);\
 LCDWriteString(msg);\
}

#define LCDWriteIntXY(x,y,val,fl) {\
 LCDGotoXY(x,y);\
 LCDWriteInt(val,fl);\
}
/***************************************************/




/*_________________________________________________________________________________________*/
#endif

 

[be80be]

haowhaow the way the LCD module works with Hi-tech you can't use E on PORTD.
It writes the lcd data as one byte to PORTD and then shifts it for 4 bit mode

 

[be80be]

haowhaow take a look at this your doing something wrong with the Library Files

There no way your code will work on a real chip I think your loading a ISIS sample and changing it.
It will let you but that don't mean it works. I only have the demo and I don't think to much of it.

This code will work just change for your chip I did it on a 18f4550 it will work on the 18f4520 too. Just change for that chip.

 

[haowhaow]

haowhaow take a look at this your doing something wrong with the Library Files

There no way your code will work on a real chip I think your loading a ISIS sample and changing it.
It will let you but that don't mean it works. I only have the demo and I don't think to much of it.

This code will work just change for your chip I did it on a 18f4550 it will work on the 18f4520 too. Just change for that chip.

in the lcd.h file
#define LCD_DATA LATD
#define LCD_DATA_PORT PORTD
what it mean??
how to connect lcd data with port D?
lcd_d0 with LATD0??
lcd_d1 with LATD1??
lcd_d2 with LATD2?? and so on???

 

[be80be]

No you have data on PORTD 0 to 3 and E, RS, RW on say PORTB

Here a better look

 

[haowhaow]

my lcd display value keep on fluctuating ......may i know how to solve it??