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help with lcd

 
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hadeelqasaimeh



Joined: 05 Jan 2006
Posts: 105

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help with lcd
PostPosted: Thu Mar 02, 2006 3:30 am     Reply with quote

hi all
im useing the following library with 2*16 lcd module and 4*16 lcd module
but i have no idea how to print some thing in a specific position
Code:

#include <jonsinc.h>
#use delay(clock=4000000)

// 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;
    }

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


for example if i want to print hello i do the following:
Code:

   LCD_PutCmd ( CLEAR_DISP );
   LCD_SetPosition ( LINE_16_1);
   printf(LCD_PutChar,"hello")

but how to print h in some spcific cell
thanx alot
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