155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
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/**
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* Ansteuerung eines HD44780 kompatiblen LCD im 4-Bit-Interfacemodus
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*
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* Die Pinbelegung ist <EFBFBD>ber #defines in lcd.h konfigurierbar
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*
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* @copyright 2012 Institute Automation of Complex Power Systems (ACS), RWTH Aachen University
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* @license http://www.gnu.org/licenses/gpl.txt GNU Public License
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* @link http://www.mikrocontroller.net/articles/HD44780
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* @link http://www.mikrocontroller.net/articles/AVR-GCC-Tutorial/LCD-Ansteuerung
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*/
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#ifndef _LCD_H_
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#define _LCD_H_
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#include <stdbool.h>
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#include <stdint.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "rotary.h"
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// Pinbelegung f<>r das LCD, an verwendete Pins anpassen
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// Alle LCD Pins müssen an einem Port angeschlossen sein und die 4
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// Datenleitungen müssen auf aufeinanderfolgenden Pins liegen
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// LCD DB4-DB7 <--> PORTD Bit PD0-PD3
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#define LCD_PORT PORTC
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#define LCD_DDR DDRC
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#define LCD_DB PC4
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// LCD RS <--> PORTD Bit PD4 (RS: 0=Data, 1=Command)
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#define LCD_RS PC3
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// LCD EN <--> PORTD Bit PD5 (EN: 1-Impuls für Daten)
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#define LCD_EN PC2
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// LCD Ausf<73>hrungszeiten (MS=Millisekunden, US=Mikrosekunden)
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#define LCD_BOOTUP_MS 15
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#define LCD_ENABLE_US 1
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#define LCD_WRITEDATA_US 46
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#define LCD_COMMAND_US 42
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#define LCD_SOFT_RESET_MS1 5
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#define LCD_SOFT_RESET_MS2 1
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#define LCD_SOFT_RESET_MS3 1
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#define LCD_SET_4BITMODE_MS 5
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#define LCD_CLEAR_DISPLAY_MS 2
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#define LCD_CURSOR_HOME_MS 2
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// Zeilendefinitionen des verwendeten LCD
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// Die Einträge hier sollten f<>r ein LCD mit einer Zeilenl<6E>nge von 16 Zeichen passen
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// Bei anderen Zeilenlängen müssen diese Einträge angepasst werden
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#define LCD_DDADR_LINE1 0x00
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#define LCD_DDADR_LINE2 0x40
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#define LCD_DDADR_LINE3 0x10
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#define LCD_DDADR_LINE4 0x50
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// Initialisierung: muss ganz am Anfang des Programms aufgerufen werden.
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void lcd_init( void );
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// LCD l<>schen
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void lcd_clear( void );
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// Cursor in die 1. Zeile, 0-te Spalte
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void lcd_home( void );
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// Cursor an eine beliebige Position
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void lcd_setcursor( uint8_t spalte, uint8_t zeile );
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// Ausgabe eines einzelnen Zeichens an der aktuellen Cursorposition
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void lcd_data( uint8_t data );
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// Ausgabe eines Strings an der aktuellen Cursorposition
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void lcd_string( const char *data );
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// Definition eines benutzerdefinierten Sonderzeichens.
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// data muss auf ein Array[5] mit den Spaltencodes des zu definierenden Zeichens
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// zeigen
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void lcd_generatechar( uint8_t code, const uint8_t *data );
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// Ausgabe eines Kommandos an das LCD.
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void lcd_command( uint8_t data );
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// Ausgabe Balkenanzeige
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void lcd_bar(uint8_t startx, uint8_t starty, uint8_t length, uint8_t percent);
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// Ausgabe einer ganzen Zahl
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void lcd_int(int16_t number, uint8_t length);
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// LCD Befehle und Argumente.
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// Zur Verwendung in lcd_command
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// Clear Display -------------- 0b00000001
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#define LCD_CLEAR_DISPLAY 0x01
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// Cursor Home ---------------- 0b0000001x
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#define LCD_CURSOR_HOME 0x02
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// Set Entry Mode ------------- 0b000001xx
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#define LCD_SET_ENTRY 0x04
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#define LCD_ENTRY_DECREASE 0x00
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#define LCD_ENTRY_INCREASE 0x02
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#define LCD_ENTRY_NOSHIFT 0x00
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#define LCD_ENTRY_SHIFT 0x01
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// Set Display ---------------- 0b00001xxx
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#define LCD_SET_DISPLAY 0x08
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#define LCD_DISPLAY_OFF 0x00
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#define LCD_DISPLAY_ON 0x04
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#define LCD_CURSOR_OFF 0x00
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#define LCD_CURSOR_ON 0x02
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#define LCD_BLINKING_OFF 0x00
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#define LCD_BLINKING_ON 0x01
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// Set Shift ------------------ 0b0001xxxx
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#define LCD_SET_SHIFT 0x10
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#define LCD_CURSOR_MOVE 0x00
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#define LCD_DISPLAY_SHIFT 0x08
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#define LCD_SHIFT_LEFT 0x00
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#define LCD_SHIFT_RIGHT 0x04
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// Set Function --------------- 0b001xxxxx
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#define LCD_SET_FUNCTION 0x20
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#define LCD_FUNCTION_4BIT 0x00
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#define LCD_FUNCTION_8BIT 0x10
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#define LCD_FUNCTION_1LINE 0x00
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#define LCD_FUNCTION_2LINE 0x08
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#define LCD_FUNCTION_5X7 0x00
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#define LCD_FUNCTION_5X10 0x04
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#define LCD_SOFT_RESET 0x30
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// Set CG RAM Address --------- 0b01xxxxxx (Character Generator RAM)
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#define LCD_SET_CGADR 0x40
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#define LCD_GC_CHAR0 0
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#define LCD_GC_CHAR1 1
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#define LCD_GC_CHAR2 2
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#define LCD_GC_CHAR3 3
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#define LCD_GC_CHAR4 4
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#define LCD_GC_CHAR5 5
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#define LCD_GC_CHAR6 6
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#define LCD_GC_CHAR7 7
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// Set DD RAM Address --------- 0b1xxxxxxx (Display Data RAM)
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#define LCD_SET_DDADR 0x80
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#endif /* _LCD_H_ */
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