348 lines
14 KiB
C
348 lines
14 KiB
C
/*************************************************************************
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Title : C include file for the HD44780U LCD library (lcd.c)
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Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
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License: GNU General Public License Version 3
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File: $Id: lcd.h,v 1.14.2.4 2015/01/20 17:16:07 peter Exp $
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Software: AVR-GCC 4.x
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Hardware: any AVR device, memory mapped mode only for AVR with
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memory mapped interface (AT90S8515/ATmega8515/ATmega128)
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***************************************************************************/
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/**
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@mainpage
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Collection of libraries for AVR-GCC
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@author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
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@copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
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@file
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@defgroup pfleury_lcd LCD library <lcd.h>
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@code #include <lcd.h> @endcode
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@brief Basic routines for interfacing a HD44780U-based character LCD display
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LCD character displays can be found in many devices, like espresso machines, laser printers.
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The Hitachi HD44780 controller and its compatible controllers like Samsung KS0066U have become an industry standard for these types of displays.
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This library allows easy interfacing with a HD44780 compatible display and can be
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operated in memory mapped mode (LCD_IO_MODE defined as 0 in the include file lcd.h.) or in
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4-bit IO port mode (LCD_IO_MODE defined as 1). 8-bit IO port mode is not supported.
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Memory mapped mode is compatible with old Kanda STK200 starter kit, but also supports
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generation of R/W signal through A8 address line.
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@see The chapter <a href=" http://homepage.hispeed.ch/peterfleury/avr-lcd44780.html" target="_blank">Interfacing a HD44780 Based LCD to an AVR</a>
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on my home page, which shows example circuits how to connect an LCD to an AVR controller.
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@author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
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@version 2.0
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@copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
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*/
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#pragma once
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#include <inttypes.h>
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#include <avr/pgmspace.h>
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#if (__GNUC__ * 100 + __GNUC_MINOR__) < 405
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# error "This library requires AVR-GCC 4.5 or later, update to newer AVR-GCC compiler !"
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#endif
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/**@{*/
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/*
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* LCD and target specific definitions below can be defined in a separate include file with name lcd_definitions.h instead modifying this file
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* by adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile
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* All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
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*/
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#ifdef _LCD_DEFINITIONS_FILE
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# include "lcd_definitions.h"
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#endif
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/**
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* @name Definition for LCD controller type
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* Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller.
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*/
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#ifndef LCD_CONTROLLER_KS0073
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# define LCD_CONTROLLER_KS0073 0 /**< Use 0 for HD44780 controller, 1 for KS0073 controller */
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#endif
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/**
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* @name Definitions for Display Size
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* Change these definitions to adapt setting to your display
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*
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* These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
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* adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile.
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* All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
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*
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*/
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#ifndef LCD_LINES
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# define LCD_LINES 2 /**< number of visible lines of the display */
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#endif
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#ifndef LCD_DISP_LENGTH
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# define LCD_DISP_LENGTH 16 /**< visibles characters per line of the display */
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#endif
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#ifndef LCD_LINE_LENGTH
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# define LCD_LINE_LENGTH 0x40 /**< internal line length of the display */
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#endif
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#ifndef LCD_START_LINE1
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# define LCD_START_LINE1 0x00 /**< DDRAM address of first char of line 1 */
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#endif
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#ifndef LCD_START_LINE2
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# define LCD_START_LINE2 0x40 /**< DDRAM address of first char of line 2 */
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#endif
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#ifndef LCD_START_LINE3
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# define LCD_START_LINE3 0x14 /**< DDRAM address of first char of line 3 */
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#endif
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#ifndef LCD_START_LINE4
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# define LCD_START_LINE4 0x54 /**< DDRAM address of first char of line 4 */
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#endif
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#ifndef LCD_WRAP_LINES
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# define LCD_WRAP_LINES 0 /**< 0: no wrap, 1: wrap at end of visibile line */
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#endif
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/**
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* @name Definitions for 4-bit IO mode
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*
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* The four LCD data lines and the three control lines RS, RW, E can be on the
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* same port or on different ports.
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* Change LCD_RS_PORT, LCD_RW_PORT, LCD_E_PORT if you want the control lines on
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* different ports.
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*
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* Normally the four data lines should be mapped to bit 0..3 on one port, but it
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* is possible to connect these data lines in different order or even on different
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* ports by adapting the LCD_DATAx_PORT and LCD_DATAx_PIN definitions.
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*
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* Adjust these definitions to your target.\n
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* These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
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* adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile.
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* All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
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*
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*/
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#define LCD_IO_MODE 1 /**< 0: memory mapped mode, 1: IO port mode */
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#if LCD_IO_MODE
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# ifndef LCD_PORT
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# define LCD_PORT PORTA /**< port for the LCD lines */
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# endif
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# ifndef LCD_DATA0_PORT
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# define LCD_DATA0_PORT LCD_PORT /**< port for 4bit data bit 0 */
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# endif
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# ifndef LCD_DATA1_PORT
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# define LCD_DATA1_PORT LCD_PORT /**< port for 4bit data bit 1 */
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# endif
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# ifndef LCD_DATA2_PORT
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# define LCD_DATA2_PORT LCD_PORT /**< port for 4bit data bit 2 */
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# endif
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# ifndef LCD_DATA3_PORT
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# define LCD_DATA3_PORT LCD_PORT /**< port for 4bit data bit 3 */
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# endif
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# ifndef LCD_DATA0_PIN
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# define LCD_DATA0_PIN 4 /**< pin for 4bit data bit 0 */
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# endif
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# ifndef LCD_DATA1_PIN
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# define LCD_DATA1_PIN 5 /**< pin for 4bit data bit 1 */
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# endif
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# ifndef LCD_DATA2_PIN
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# define LCD_DATA2_PIN 6 /**< pin for 4bit data bit 2 */
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# endif
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# ifndef LCD_DATA3_PIN
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# define LCD_DATA3_PIN 7 /**< pin for 4bit data bit 3 */
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# endif
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# ifndef LCD_RS_PORT
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# define LCD_RS_PORT LCD_PORT /**< port for RS line */
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# endif
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# ifndef LCD_RS_PIN
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# define LCD_RS_PIN 3 /**< pin for RS line */
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# endif
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# ifndef LCD_RW_PORT
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# define LCD_RW_PORT LCD_PORT /**< port for RW line */
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# endif
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# ifndef LCD_RW_PIN
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# define LCD_RW_PIN 2 /**< pin for RW line */
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# endif
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# ifndef LCD_E_PORT
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# define LCD_E_PORT LCD_PORT /**< port for Enable line */
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# endif
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# ifndef LCD_E_PIN
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# define LCD_E_PIN 1 /**< pin for Enable line */
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# endif
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#elif defined(__AVR_AT90S4414__) || defined(__AVR_AT90S8515__) || defined(__AVR_ATmega64__) || defined(__AVR_ATmega8515__) || defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega161__) || defined(__AVR_ATmega162__)
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/*
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* memory mapped mode is only supported when the device has an external data memory interface
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*/
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# define LCD_IO_DATA 0xC000 /* A15=E=1, A14=RS=1 */
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# define LCD_IO_FUNCTION 0x8000 /* A15=E=1, A14=RS=0 */
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# define LCD_IO_READ 0x0100 /* A8 =R/W=1 (R/W: 1=Read, 0=Write */
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#else
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# error "external data memory interface not available for this device, use 4-bit IO port mode"
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#endif
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/**
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* @name Definitions of delays
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* Used to calculate delay timers.
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* Adapt the F_CPU define in the Makefile to the clock frequency in Hz of your target
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*
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* These delay times can be adjusted, if some displays require different delays.\n
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* These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
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* adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile.
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* All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
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*/
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#ifndef LCD_DELAY_BOOTUP
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# define LCD_DELAY_BOOTUP 16000 /**< delay in micro seconds after power-on */
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#endif
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#ifndef LCD_DELAY_INIT
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# define LCD_DELAY_INIT 5000 /**< delay in micro seconds after initialization command sent */
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#endif
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#ifndef LCD_DELAY_INIT_REP
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# define LCD_DELAY_INIT_REP 64 /**< delay in micro seconds after initialization command repeated */
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#endif
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#ifndef LCD_DELAY_INIT_4BIT
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# define LCD_DELAY_INIT_4BIT 64 /**< delay in micro seconds after setting 4-bit mode */
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#endif
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#ifndef LCD_DELAY_BUSY_FLAG
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# define LCD_DELAY_BUSY_FLAG 4 /**< time in micro seconds the address counter is updated after busy flag is cleared */
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#endif
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#ifndef LCD_DELAY_ENABLE_PULSE
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# define LCD_DELAY_ENABLE_PULSE 1 /**< enable signal pulse width in micro seconds */
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#endif
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/**
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* @name Definitions for LCD command instructions
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* The constants define the various LCD controller instructions which can be passed to the
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* function lcd_command(), see HD44780 data sheet for a complete description.
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*/
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/* instruction register bit positions, see HD44780U data sheet */
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#define LCD_CLR 0 /* DB0: clear display */
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#define LCD_HOME 1 /* DB1: return to home position */
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#define LCD_ENTRY_MODE 2 /* DB2: set entry mode */
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#define LCD_ENTRY_INC 1 /* DB1: 1=increment, 0=decrement */
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#define LCD_ENTRY_SHIFT 0 /* DB2: 1=display shift on */
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#define LCD_ON 3 /* DB3: turn lcd/cursor on */
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#define LCD_ON_DISPLAY 2 /* DB2: turn display on */
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#define LCD_ON_CURSOR 1 /* DB1: turn cursor on */
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#define LCD_ON_BLINK 0 /* DB0: blinking cursor ? */
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#define LCD_MOVE 4 /* DB4: move cursor/display */
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#define LCD_MOVE_DISP 3 /* DB3: move display (0-> cursor) ? */
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#define LCD_MOVE_RIGHT 2 /* DB2: move right (0-> left) ? */
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#define LCD_FUNCTION 5 /* DB5: function set */
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#define LCD_FUNCTION_8BIT 4 /* DB4: set 8BIT mode (0->4BIT mode) */
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#define LCD_FUNCTION_2LINES 3 /* DB3: two lines (0->one line) */
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#define LCD_FUNCTION_10DOTS 2 /* DB2: 5x10 font (0->5x7 font) */
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#define LCD_CGRAM 6 /* DB6: set CG RAM address */
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#define LCD_DDRAM 7 /* DB7: set DD RAM address */
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#define LCD_BUSY 7 /* DB7: LCD is busy */
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/* set entry mode: display shift on/off, dec/inc cursor move direction */
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#define LCD_ENTRY_DEC 0x04 /* display shift off, dec cursor move dir */
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#define LCD_ENTRY_DEC_SHIFT 0x05 /* display shift on, dec cursor move dir */
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#define LCD_ENTRY_INC_ 0x06 /* display shift off, inc cursor move dir */
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#define LCD_ENTRY_INC_SHIFT 0x07 /* display shift on, inc cursor move dir */
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/* display on/off, cursor on/off, blinking char at cursor position */
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#define LCD_DISP_OFF 0x08 /* display off */
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#define LCD_DISP_ON 0x0C /* display on, cursor off */
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#define LCD_DISP_ON_BLINK 0x0D /* display on, cursor off, blink char */
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#define LCD_DISP_ON_CURSOR 0x0E /* display on, cursor on */
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#define LCD_DISP_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */
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/* move cursor/shift display */
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#define LCD_MOVE_CURSOR_LEFT 0x10 /* move cursor left (decrement) */
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#define LCD_MOVE_CURSOR_RIGHT 0x14 /* move cursor right (increment) */
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#define LCD_MOVE_DISP_LEFT 0x18 /* shift display left */
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#define LCD_MOVE_DISP_RIGHT 0x1C /* shift display right */
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/* function set: set interface data length and number of display lines */
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#define LCD_FUNCTION_4BIT_1LINE 0x20 /* 4-bit interface, single line, 5x7 dots */
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#define LCD_FUNCTION_4BIT_2LINES 0x28 /* 4-bit interface, dual line, 5x7 dots */
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#define LCD_FUNCTION_8BIT_1LINE 0x30 /* 8-bit interface, single line, 5x7 dots */
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#define LCD_FUNCTION_8BIT_2LINES 0x38 /* 8-bit interface, dual line, 5x7 dots */
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#define LCD_MODE_DEFAULT ((1 << LCD_ENTRY_MODE) | (1 << LCD_ENTRY_INC))
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/**
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* @name Functions
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*/
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/**
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@brief Initialize display and select type of cursor
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@param dispAttr \b LCD_DISP_OFF display off\n
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\b LCD_DISP_ON display on, cursor off\n
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\b LCD_DISP_ON_CURSOR display on, cursor on\n
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\b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing
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@return none
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*/
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extern void lcd_init(uint8_t dispAttr);
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/**
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@brief Clear display and set cursor to home position
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@return none
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*/
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extern void lcd_clrscr(void);
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/**
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@brief Set cursor to home position
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@return none
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*/
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extern void lcd_home(void);
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/**
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@brief Set cursor to specified position
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@param x horizontal position\n (0: left most position)
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@param y vertical position\n (0: first line)
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@return none
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*/
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extern void lcd_gotoxy(uint8_t x, uint8_t y);
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/**
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@brief Display character at current cursor position
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@param c character to be displayed
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@return none
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*/
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extern void lcd_putc(char c);
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/**
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@brief Display string without auto linefeed
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@param s string to be displayed
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@return none
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*/
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extern void lcd_puts(const char *s);
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/**
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@brief Display string from program memory without auto linefeed
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@param progmem_s string from program memory be be displayed
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@return none
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@see lcd_puts_P
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*/
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extern void lcd_puts_p(const char *progmem_s);
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/**
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@brief Send LCD controller instruction command
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@param cmd instruction to send to LCD controller, see HD44780 data sheet
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@return none
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*/
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extern void lcd_command(uint8_t cmd);
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/**
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@brief Send data byte to LCD controller
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Similar to lcd_putc(), but without interpreting LF
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@param data byte to send to LCD controller, see HD44780 data sheet
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@return none
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*/
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extern void lcd_data(uint8_t data);
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/**
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@brief macros for automatically storing string constant in program memory
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*/
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#define lcd_puts_P(__s) lcd_puts_p(PSTR(__s))
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/**@}*/
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