PIC18 LaurTec Library
3.1.1
Open Source C Library for PIC18 Microcontrollers based on C18 - XC8 Compilers
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LCD_44780_I2C.h
Go to the documentation of this file.
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/*******************************************************************************
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Author : Mauro Laurenti
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Version : 1.3
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Created on Date : 09/03/2012
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Last update : 04/10/2013
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CopyRight 2006-2013 all rights are reserved
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********************************************************
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SOFTWARE LICENSE AGREEMENT
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********************************************************
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The usage of the supplied software imply the acceptance of the following license.
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The software supplied herewith by Mauro Laurenti (the Author) is intended for
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use solely and exclusively on Microchip PIC Microcontroller (registered mark).
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The software is owned by the Author, and is protected under applicable
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copyright laws. All rights are reserved.
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Any use in violation of the foregoing restrictions may subject the
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user to criminal sanctions under applicable laws, as well as to civil liability
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for the breach of the terms and conditions of this license.
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Commercial use is forbidden without a written acknowledgment with the Author.
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Personal or educational use is allowed if the application containing the
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following software doesn't aim to commercial use or monetary earning of any kind.
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THIS SOFTWARE IS PROVIDED IN AN "AS IS" CONDITION. NO WARRANTIES,
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WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
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TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE AUTHOR SHALL NOT,
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IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
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CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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********************************************************
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PURPOSES
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********************************************************
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This library contains all the functions that are handy for controlling
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an LCD with a 44780 Hitachi controller via an I2C interface made with a PCF8574
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Before using the functions you have to properly initialize the I2C module to 100KHz.
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hardware connetions are (using Eagle CAD nomenclature):
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PCF8574 P0 -> LCD D4
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PCF8574 P1 -> LCD D5
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PCF8574 P2 -> LCD D6
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PCF8574 P3 -> LCD D7
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PCF8574 P4 -> LCD E
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PCF8574 P5 -> LCD R/W
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PCF8574 P6 -> LCD RS
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PCF8574 P7 -> LCD LED (use a PNP transistor as buffer to drive the backlight LED).
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SDA, SCL must be connected to the I2C buffer with pull-up resistors.
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A0-A1-A2 adderss pins must be set as required.
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Set PCF8574_ADDRESS_L (see below) accordengly to the address pis A0-A1-A2.
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More details and pictures can be downloaded from the Brief Note BN0015 (www.LaurTec.com)
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**********************************************************************************************/
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#ifndef LCD_44780_I2C_H
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#define LCD_44780_I2C_H
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#ifdef __XC8
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#include <xc.h>
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#include <stdlib.h>
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#ifndef _PIC18
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#error "The LCD_44780_I2C Library supports only PIC18 devices"
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#endif
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#endif
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#include <
delay.h
>
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#ifdef __18CXX
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#include <i2c.h>
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#endif
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#ifndef __XC8
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#include <ctype.h>
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#endif
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//**************************************************
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// LCD constants
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// Each bit is connected to the PCF8574
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//**************************************************
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#define LCD_D0 0b00000001
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#define LCD_D1 0b00000010
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#define LCD_D2 0b00000100
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#define LCD_D3 0b00001000
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#define LCD_E 0b00010000
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#define LCD_RW 0b00100000
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#define LCD_RS 0b01000000
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#define LCD_LED 0b10000000
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//**************************************************
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// PCF8574 Address
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// PCF8574_ADDRESS_H refers to the enbedded address (PCF8574 model)
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// PCF8574_ADDRESS_L refers to the A0, A1, A2 pins
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//**************************************************
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//PCF8574
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//#define PCF8574_ADDRESS_H 0x40
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//PCF8574A
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#define PCF8574_ADDRESS_H 0x70
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#define PCF8574_ADDRESS_L 0x00
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//**************************************************
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// Constant Definitions
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#define LEFT 0b00000000
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#define RIGHT 0b00000100
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#define TURN_ON_CURSOR 0b00000010
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#define TURN_OFF_CURSOR 0b00000000
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#define TURN_ON_LED_LCD 0b00000000
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#define TURN_OFF_LED_LCD 0b10000000
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#define BLINKING_ON 0b00000001
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#define BLINKING_OFF 0b00000000
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//**************************************************
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void
enable_pulse_LCD
(
void
);
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#define Epulse enable_pulse_LCD
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void
send_command_LCD
(
unsigned
char
data);
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#define SendCommand send_command_LCD
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void
home_LCD
(
void
);
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#define HomeLCD home_LCD
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void
shift_LCD
(
unsigned
char
shift,
unsigned
char
number_of_shift);
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#define ShiftLCD shift_LCD
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void
shift_cursor_LCD
(
unsigned
char
shift,
unsigned
char
number_of_shift);
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#define ShiftCursorLCD shift_cursor_LCD
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void
goto_line_LCD
(
unsigned
char
line);
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#define GotoLineLCD goto_line_LCD
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void
goto_xy_LCD
(
unsigned
char
x,
unsigned
char
y);
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void
write_char_LCD
(
unsigned
char
value);
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#define WriteCharLCD write_char_LCD
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#ifndef __XC8
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void
write_message_LCD
(
const
rom
unsigned
char
*buffer);
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#endif
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#ifdef __XC8
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void
write_message_LCD
(
const
unsigned
char
*buffer);
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#endif
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#define WriteStringLCD write_message_LCD
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void
write_string_LCD
(
unsigned
char
*buffer);
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#define WriteVarLCD write_string_LCD
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void
write_integer_LCD
(
int
value,
unsigned
char
number_of_digits);
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#define WriteIntLCD write_integer_LCD
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void
clear_LCD
(
void
);
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#define ClearLCD clear_LCD
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void
cursor_LCD
(
unsigned
char
active,
unsigned
char
blinking);
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#define CursorLCD cursor_LCD
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void
backlight_LCD
(
unsigned
char
active);
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#define BacklightLCD backlight_LCD
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void
initialize_LCD
(
unsigned
char
quartz_frequency);
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#define OpenLCD initialize_LCD
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#endif
LaurTec_PIC_libraries_v_3.1.1
inc
LCD_44780_I2C.h
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