Keypad+LCD example: i just need to set LCD port.....[SOLVED]

[Lucidan]

I'm using example file EX_LCDKB.C along with LCD.C and KBD.C on a 16f877. I already changed the keypad port to portD (in KBD.C) succesfully.

I also need to change the port settings in LCD.C from this:

// D0 enable
// D1 rs
// D2 rw
// D4 D4
// D5 D5
// D6 D6
// D7 D7

to this:*

// E1 enable*
// E0 rs*
// E2 rw*
// D4 D4
// D5 D5
// D6 D6
// D7 D7

Below is the original example LCD.C. How do I set the outputs the way I want them? Any help would be appreciated.




///////////////////////////////////////////////////////////////////////////
//// LCDD.C ////
//// Driver for common 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 1996,2003 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:
// D0 enable
// D1 rs
// D2 rw
// D4 D4
// D5 D5
// D6 D6
// D7 D7
//
// LCD pins D0-D3 are not used and PIC D3 is not used.

// Un-comment the following define to use port B
// #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


#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);
}

[PCM programmer]

Use one of these two drivers in the code library.
Flex driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=24661
Mark's driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=20182

[Lucidan]

Thank you for your quick response.

I cannot compile with flex_LCD:

1st error: "a #device is needed before this line"
-So I placed "#device PIC16f877" before that line.

Then I got these errors:

Undeclared identifier: PIN_D0
Undeclared identifier: PIN_D1
Undeclared identifier: PIN_D2

....and so on.

Why does it not recognise these standard PIC pins anymore?

[PCM programmer]

[Lucidan]

I'm sorry, i forgot to mention I was already using the 'hello world' test file. But to make sure I created a new project, and tried to compile the small testing code.
I got the same error....then I noticed the first line was:

include 16F877

instead of

#include 16F877

That was the error! How could I miss that.
The code is now working perfectly! Thanks for suggesting FLEX_LCD.C.

One more question though:

I'm using a 20x2 LCD, is there a simple way to adapt this current code to support 2x20 LCD's? I read in another topic you PM'ed someone 20x2 code (long time ago though).

EDIT: I just realised i can simply lcd_putc 16+ character lines and see if it works, and it does! This code works perfectly with my 20x2 HD44780 LCD. Thanks for helping out.

[Lucidan]

Wrapping it up for others new to CCS:

I wanted to use the keypad+lcd example, but first focused on just getting the LCD (HD44780 2x20) to work.

I used two source files:
- the above code posted by PCM Programmer
- the example file flex_LCD.C posted elsewhere on this forum (just search for it).

I simply changed the LCD ports in flex_LCD.C to match my devboard (a LAB-x1 made by Micro Engineering Labs).
That got the LCD working.

EDIT:
To get the keypad (4x4) working with the LCD, I used these source files:
-EX_LCD_KB.c (unmodified)
-flex_lcd.c (modified pins only)
-KBD.C (modified as shown in http://www.ccsinfo.com/forum/viewtopic.php?t=28022&start=14) to support 4x4 keypads, I also modified the pin numbers to match my devboard.