LCD-Driver Problem

[Guest]

Hello,
I've got this LCD driver from a friend.
The only problem abour it: This driver is adapted to PORTB, but I need the Interrupt-Pins on this port for another application.

I have difficulties to understand this pragram exactly and wanted to ask if anybody could modify the driver for me to the following allocation:

RC0: D1
RC1: D2
RC2: D3
RC3: D4

RB0: RS
RB1: E
RB2: R/W

I'm using the PIC16C773 (CCS-Compiler...).
That's the driver:

============================

///////////////////////////////////////////////////////////////////////////
//// LCD_W.c / 2.12.2004 ////
//// Treiber für Standard LCDs ////
//// (WSH Demoversion) ////
//// ////
//// lcd_init() Muß einmal ganz zu Beginn aufgerufen werden ////
//// ////
//// lcd_putc(c) Zeigt c an der nächsten Position am LCD an. ////
//// Folgende Anweisungen haben Sonderfunktion: ////
//// \f Löscht Anzeige ////
//// \n Geht zum Anfang der nächsten Zeile ////
//// \b Rückschritt um eine Position ////
//// ////
//// lcd_gotoxy(x,y) Setzt Schreibposition (oben links ist 1,1) ////
//// ////
//// lcd_getc(x,y) Liest Zeichen an Pos. x,y vom LCD ////
//// ////
//// lcd_puts16(zeil_nr, zeil_inh) Gibt komplette 16-Zeichen-Zeile ////
//// aus, die als String-Adresse übergeben wird ////
//// ////
//// lcd_puts24(zeil_nr, zeil_inh) Gibt komplette 24-Zeichen-Zeile ////
//// aus, die als String-Adresse übergeben wird ////
//// ////
///////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS C ////
//// compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, reproduction ////
//// or distribution is permitted without written permission. ////
//// Derivative programs created using this software in object code ////
//// form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////

// As defined in the following structure the pin connection is as follows:
// B0 ENABLE
// B1 RS
// B2 R/W
// B4 D4
// B5 D5
// B6 D6
// B7 D7
//
// LCD pins D0-D3 are not used and PIC B3 is not used.

#define use_portb_lcd TRUE


struct lcd_pin_map { // This structure is overlayed
BOOLEAN enable; // on to an I/O port to gain
BOOLEAN rs; // access to the LCD pins.
BOOLEAN rw; // The bits are allocated from
BOOLEAN unused; // low order up. ENABLE will
int data : 4; // be pin B0.
} lcd;

#byte lcd = 6
#define set_tris_lcd(x) set_tris_b(x)

#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40 // LCD RAM address for the second line


BYTE const LCD_INIT_STRING[4] = {0x20 | (lcd_type << 2), 0xc, 1, 6};
// These bytes need to be sent to the LCD
// to start it up.


// The following are used for setting
// the I/O port direction register.

struct lcd_pin_map const LCD_WRITE = {0,0,0,0,0}; // For write mode all pins are out
struct lcd_pin_map const LCD_READ = {0,0,0,0,15}; // For read mode data pins are in



BYTE lcd_read_byte() {
BYTE low,high;
set_tris_lcd(LCD_READ);
lcd.rw = 1;
delay_cycles(1);
lcd.enable = 1;
delay_cycles(1);
high = lcd.data;
lcd.enable = 0;
delay_cycles(1);
lcd.enable = 1;
delay_us(1);
low = lcd.data;
lcd.enable = 0;
set_tris_lcd(LCD_WRITE);
return( (high<<4) | low);
}


void lcd_send_nibble( BYTE n ) {
lcd.data = n;
delay_cycles(1);
lcd.enable = 1;
delay_us(2);
lcd.enable = 0;
}


void lcd_send_byte( BYTE address, BYTE n ) {

lcd.rs = 0;
while ( bit_test(lcd_read_byte(),7) ) ;
lcd.rs = address;
delay_cycles(1);
lcd.rw = 0;
delay_cycles(1);
lcd.enable = 0;
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0xf);
}


void lcd_init() {
BYTE i;
set_tris_lcd(LCD_WRITE);
lcd.rs = 0;
lcd.rw = 0;
lcd.enable = 0;
delay_ms(15);
for(i=1;i<=3;++i) {
lcd_send_nibble(3);
delay_ms(5);
}
lcd_send_nibble(2);
for(i=0;i<=3;++i)
lcd_send_byte(0,LCD_INIT_STRING[i]);
}


void lcd_gotoxy( BYTE x, BYTE y) {
BYTE address;

if(y!=1)
address=lcd_line_two;
else
address=0;
address+=x-1;
lcd_send_byte(0,0x80|address);
}

void lcd_putc( char c) {
switch (c) {
case '\f' : lcd_send_byte(0,1);
delay_ms(2);
break;
case '\n' : lcd_gotoxy(1,2); break;
case '\b' : lcd_send_byte(0,0x10); break;
default : lcd_send_byte(1,c); break;
}
}

char lcd_getc( BYTE x, BYTE y) {
char value;

lcd_gotoxy(x,y);
while ( bit_test(lcd_read_byte(),7) ); // wait until busy flag is low
lcd.rs=1;
value = lcd_read_byte();
lcd.rs=0;
return(value);
}

/*----------------------------------------------------------------*/
/*- Eigene Funktionen -*/
/*----------------------------------------------------------------*/


//----------------------------------------------------------------
void lcd_puts16(int zeil_nr, char zeil_inh)
{
int counter;

lcd_gotoxy(1, zeil_nr); /* Cursor setzen */

for(counter=0; counter < 17; counter++)
{
lcd_putc(zeil_inh[counter]);
}
return;
}
//----------------------------------------------------------------




//----------------------------------------------------------------
void lcd_puts24(int zeil_nr, char zeil_inh)
{
int counter;

lcd_gotoxy(1, zeil_nr); /* Cursor setzen */

for(counter=0; counter < 25; counter++)
{
lcd_putc(zeil_inh[counter]);
}
return;
}
//----------------------------------------------------------------

===============================

Thank's a lot!
Nice greets from Austria,
Pfiff!

[Foppie]

you can look at this driver as example of how to modify your driver.

[Guest]

Is it correct that I just have to modify this part of my driver:

[leesing2k3]

http://www.8052.com/tutlcd.phtml
http://www.8052.com/tutlcd2.phtml

read these to fully understand how lcd works and you will sure know how to modify your code. you can even write your own after this, like using shift register to save some ports.

[Guest]

I don't have the time to do this.
Wouldn't it be possible, that you just tell me how I have to modify the lcd_pin_map if i'm using two different ports.

PORTB for E, RS, R/W and PORTC for datapins

That's everything I have to know.

[PCM programmer]

Look at Mark's driver for the split port example, or
if you can't figure that out, then look at my driver
for a quick solution:
http://www.ccsinfo.com/forum/viewtopic.php?t=20182
http://www.ccsinfo.com/forum/viewtopic.php?t=24661