Hola.
En verdad, no puedo hacer funcionar el LCD 4x20 en un pic18f4520 ni 4550, ahora que ando intentando con el 4550, le puse otra libreria, pero se salta las líneas 2 y 4, simplemente no las escribe, solamente escribe en las líneas 1 y 3, la libreria que utilizo es la siguiente: la saque del foro, pero no recuerdo de que parte:
LIBRERIA LCD
////////////////////////////////////////////////////////////////////////////
//// LCD4por20.C ////
//// Driver for common 4x20 LCD modules ////
//// ////
//// lcd_init() Must be called before any other function. ////
//// ////
//// lcd_putc(c) Will display c on the next position of the LCD. ////
//// The following have special meaning: ////
//// \f Clear display ////
//// \n Go to start of second line ////
//// \b Move back one position ////
//// ////
//// lcd_gotoxy(x,y) Set write position on LCD (upper left is 1,1) ////
//// ////
//// lcd_getc(x,y) Returns character at position x,y on LCD ////
//// ////
////////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,1997 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 rw
// 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;
#if defined use_portb_lcd
//#locate lcd = getenv("sfr:PORTB") // This puts the entire structure over the port
#ifdef __pch__
#locate lcd = 0xf81
#else
#locate lcd = 6
#endif
#define set_tris_lcd(x) set_tris_b(x)
#else
//#locate lcd = getenv("sfr:PORTD") // This puts the entire structure over the port
#ifdef __pch__
#locate lcd = 0xf83
#else
#locate lcd = 8
#endif
#define set_tris_lcd(x) set_tris_d(x)
#endif
#ifndef lcd_type
#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines
#endif
#define lcd_line_two 0x40 // LCD RAM address for the second line
/*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 // This puts the entire structure
// on to port B (at address 6)
#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines*/
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 lcdline;
BYTE lcd_read_byte() {
BYTE low,high;
set_tris_b(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_b(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_b(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;
switch(y) {
case 1 : address=0x80;break; //0x80
case 2 : address=0xc0;break; //0xc0
case 3 : address=0x94;break; //0x94
case 4 : address=0xd4;break; //0xd4
}
address+=x-1;
lcd_send_byte(0,address);
}
void lcd_putc( char c) {
switch (c) {
case '\f' : lcd_send_byte(0,1);
lcdline=1;
delay_ms(2);
break;
case '\n' : lcd_gotoxy(1,++lcdline); 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);
lcd.rs=1;
value = lcd_read_byte();
lcd.rs=0;
return(value);
}
tambien lei por ahí, que se tiene que cambiar la linea :
#byte lcd = 6
CAMBIARLA POR:
#byte lcd = 3969
creo que ello tiene que ver algo con direcciones de puerto segun lei, o algo asi, eso para que hagarre con los pic18f
por si, aqui tambien pongo el código de ejemplo que utilizo:
#include <18f4550.h>
#fuses hs,nowdt,noprotect,nolvp
#use delay (clock = 20000000)
#use standard_io(B)
#define use_portB_lcd TRUE
//#include <LCD4por20.c>
#include <flex_lcd204.c>
void main ()
{
lcd_init();
while(true)
{
//printf(lcd_putc,"\f \n linea\n linea\n linea");
lcd_putc("\f");
delay_ms(100);
lcd_gotoxy(1,1);
lcd_putc("hola");
delay_ms(100);
lcd_gotoxy(1,2);
lcd_putc("2da linea");
delay_ms(100);
lcd_gotoxy(1,3);
lcd_putc("3ra linea");
delay_ms(100);
lcd_gotoxy(1,4);
lcd_putc("4ta linea");
delay_ms(300);
/*
delay_ms(100);
printf(lcd_putc,"\f linea 1");
delay_ms(100);
printf(lcd_putc,"\n linea 2");
delay_ms(100);
printf(lcd_putc,"\n linea 3");
delay_ms(100);
printf(lcd_putc,"\n linea 4");
delay_ms(3000);*/
}
}
como podran ver en el código, intente de varias ,maneras, eso de querer escribir en las lineas 2 y 4.
Muchas gracias.
