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lcd problem

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hadeelqasaimeh

Joined: 05 Jan 2006
Posts: 105

lcd problem

Posted: Sat Mar 31, 2007 3:42 pm

hi all

i used to use an lcd library called "lcd_kbd1" but i find this library don't work with 18f devices...so i try to use lcd.c ,,it work,,but some characters dissapeard ,,,and its not clear how to write on line 1 or on line 2..

pcm i see your driver flex_lcd.c but it dose not run!...and again idont understand how to choose line

here is my test code:

Code:

#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#include <flex_lcd.c>
//#include <lcd.c>
void main()
{ int value;
lcd_init();
set_tris_b(0xff);

while(TRUE)
{
value=input_b();
lcd_putc('\f');
printf(lcd_putc,"value is:%x",value);
delay_ms(1000);
lcd_putc('\n');
printf(lcd_putc,"HELLO");
delay_ms(1000);
}
}

and here is my old driver....i dont know if you can correct it to work with 18f devices:

Code:

#include <jonsinc.h>
#use delay(clock=20000000)

// These defines are specifically for a 4x16 line display.
#define LINE_16_1 0x00
#define LINE_16_2 0x40
#define LINE_16_3 0x10
#define LINE_16_4 0x50
// These defines are specifically for a 4x20 line display.
#define LINE_20_1 0x00
#define LINE_20_2 0x40
#define LINE_20_3 0x14
#define LINE_20_4 0x54
// Another define for use in LCD_PutCmd
#define CLEAR_DISP 0x01
// This is a macro used in the subroutines below */
#define PULSE_EN EN = 1; delay_us ( 10 ); EN = 0; delay_ms ( 5 )
#byte port_e = 9 /* set variable that maps to memory */
#byte PORT_A = 5 /* set variable that maps to memory */
#byte port_b= 6
#byte PORT_D= 8

#byte DATA = PORT_A
#bit RS = port_e.0
#bit EN = port_e.1
char kbd_getc(void);
char getkey ( void );

// These are prototype statements.
void LCD_SetPosition ( char cX );
void LCD_PutChar ( char cX );
void LCD_PutCmd ( char cX );
void LCD_Init ( void );

// These are the display subroutines.==============================

void LCD_Init ( void )
{
// Initializing into 4-bit mode is a very exact sequence
// as defined in the datasheets for these displays.
set_tris_a ( 0x00 ); /* outputs */
set_tris_b ( 0xFC ); /* Bits 0 & 1 are outputs */
set_tris_e ( 0xF0 );
DATA = 0x00;
delay_ms ( 200 ); /* wait enough time after Vdd rise */
RS =0;
DATA = 0x03; /* init with specific nibbles to start 4-bit mode */
PULSE_EN;
PULSE_EN;
PULSE_EN;
DATA = 0x02; /* set 4-bit interface */
PULSE_EN; /* send dual nibbles hereafter, MSN first */
LCD_PutCmd ( 0x2C ); /* function set (2 lines, 5x7 characters) */
LCD_PutCmd ( 0x0E ); /* display ON, cursor on, no blink */
LCD_PutCmd ( 0x01 ); /* clear display */
LCD_PutCmd ( 0x06 ); /* entry mode set, increment */
}

void LCD_SetPosition ( cX )
{
/*
This subroutine works specifically for 4-bit Port A.
Value received cX will place cursor at a particular line and offset.
16-char display 20-char display
=============== ===============
Line 1 is hex: 00 - 0F 00 - 13
Line 2 is hex: 40 - 4F 40 - 53
Line 3 is hex: 10 - 1F 14 - 27
Line 4 is hex: 50 - 5F 54 - 67
*/
DATA = swap ( cX ) | 0x08;
PULSE_EN;
DATA = swap ( cX );
PULSE_EN;
}

void LCD_PutChar ( cX )
{
/* this subroutine works specifically for 4-bit Port A */
RS = 1;
DATA = swap ( cX ); /* send high nibble */
PULSE_EN;
DATA = swap ( cX ); /* send low nibble */
PULSE_EN;
RS = 0;
}

void LCD_PutCmd ( cX )
{
/* this subroutine works specifically for 4-bit Port A */
DATA = swap ( cX ); /* send high nibble */
PULSE_EN;
DATA = swap ( cX ); /* send low nibble */
PULSE_EN;
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
//----------------------------------------------------------------------------

Code:

/* Include this file by inserting the line "#include <jonsinc.h>" at
the beginning of the C source code. Or, if you prefer, you can embed it's
contents at the end of each of your 12C509H, 16F84H, 16F874.H, etc. files.*/

#case

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

#ifndef YES
#define YES 1
#endif

#ifndef NO
#define NO 0
#endif

#ifndef HIGH
#define HIGH 1
#endif

#ifndef LOW
#define LOW 0
#endif

#ifndef ON
#define ON 1
#endif

#ifndef OFF
#define OFF 0
#endif

#ifndef UP
#define UP 1
#endif

#ifndef DOWN
#define DOWN 0
#endif

#ifndef UCHAR
#define UCHAR char
#endif

#ifndef UINT
#define UINT long
#endif

#ifndef BIT
#define BIT short
#endif

#ifndef SCHAR
#define SCHAR signed int
#endif

#ifndef SINT
#define SINT signed long
#endif

#ifndef FLOAT
#define FLOAT float
#endif

thank you so much

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Sat Mar 31, 2007 4:30 pm

Code:

#byte port_e = 9 /* set variable that maps to memory */
#byte PORT_A = 5 /* set variable that maps to memory */
#byte port_b = 6
#byte PORT_D = 8

These register addresses are different for the 18F452. Look in the
18F452 data sheet to find the correct register addresses.

Look in the section on: SPECIAL FUNCTION REGISTER MAP
There will be a table of register addresses in that section.

hadeelqasaimeh

Joined: 05 Jan 2006
Posts: 105


Posted: Sat Mar 31, 2007 5:04 pm

i will try...thank you

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