Wolfgang Praschk / LCD

LCD-Library

Dependents:   Projekt_Wecker_LCD Projekt_Wecker_LCD Projekt_Wecker_LCD

LCD.cpp@0:b25367985a15, 2015-04-30 (annotated)

Committer:
wolpra98
Date:
Thu Apr 30 10:35:52 2015 +0000
Revision:
0:b25367985a15
A LCD-Library;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolpra98 0:b25367985a15 1
wolpra98 0:b25367985a15 2
wolpra98 0:b25367985a15 3 #include "mbed.h"
wolpra98 0:b25367985a15 4 #include "LCD.h"
wolpra98 0:b25367985a15 5
wolpra98 0:b25367985a15 6 LCD::LCD(PinName RS, PinName EN, PinName DB4, PinName DB5, PinName DB6, PinName DB7){
wolpra98 0:b25367985a15 7 _rs = RS;
wolpra98 0:b25367985a15 8 _en = EN;
wolpra98 0:b25367985a15 9 _db4 = DB4;
wolpra98 0:b25367985a15 10 _db5 = DB5;
wolpra98 0:b25367985a15 11 _db6 = DB6;
wolpra98 0:b25367985a15 12 _db7 = DB7;
wolpra98 0:b25367985a15 13 DigitalOut rs(RS);
wolpra98 0:b25367985a15 14 DigitalOut en(EN);
wolpra98 0:b25367985a15 15 BusOut db(DB4, DB5, DB6, DB7);
wolpra98 0:b25367985a15 16
wolpra98 0:b25367985a15 17 // warten auf die Bereitschaft des LCD
wolpra98 0:b25367985a15 18 wait_ms( LCD_BOOTUP_MS );
wolpra98 0:b25367985a15 19
wolpra98 0:b25367985a15 20 // Soft-Reset muss 3mal hintereinander gesendet werden zur Initialisierung
wolpra98 0:b25367985a15 21 out( LCD_SOFT_RESET );
wolpra98 0:b25367985a15 22 wait_ms( LCD_SOFT_RESET_MS1 );
wolpra98 0:b25367985a15 23 enable();
wolpra98 0:b25367985a15 24 wait_ms( LCD_SOFT_RESET_MS2 );
wolpra98 0:b25367985a15 25 enable();
wolpra98 0:b25367985a15 26 wait_ms( LCD_SOFT_RESET_MS3 );
wolpra98 0:b25367985a15 27
wolpra98 0:b25367985a15 28 // 4-bit Modus aktivieren
wolpra98 0:b25367985a15 29 out( LCD_SET_FUNCTION |
wolpra98 0:b25367985a15 30 LCD_FUNCTION_4BIT );
wolpra98 0:b25367985a15 31 wait_ms( LCD_SET_4BITMODE_MS );
wolpra98 0:b25367985a15 32
wolpra98 0:b25367985a15 33 // 4-bit Modus / 2 Zeilen / 5x7
wolpra98 0:b25367985a15 34 command( LCD_SET_FUNCTION |
wolpra98 0:b25367985a15 35 LCD_FUNCTION_4BIT |
wolpra98 0:b25367985a15 36 LCD_FUNCTION_2LINE |
wolpra98 0:b25367985a15 37 LCD_FUNCTION_5X7 );
wolpra98 0:b25367985a15 38
wolpra98 0:b25367985a15 39 // Display ein / Cursor aus / Blinken aus
wolpra98 0:b25367985a15 40 command( LCD_SET_DISPLAY |
wolpra98 0:b25367985a15 41 LCD_DISPLAY_ON |
wolpra98 0:b25367985a15 42 LCD_CURSOR_ON |
wolpra98 0:b25367985a15 43 LCD_BLINKING_OFF);
wolpra98 0:b25367985a15 44
wolpra98 0:b25367985a15 45 // Cursor inkrement / kein Scrollen
wolpra98 0:b25367985a15 46 command( LCD_SET_ENTRY |
wolpra98 0:b25367985a15 47 LCD_ENTRY_INCREASE |
wolpra98 0:b25367985a15 48 LCD_ENTRY_NOSHIFT );
wolpra98 0:b25367985a15 49
wolpra98 0:b25367985a15 50 clear();
wolpra98 0:b25367985a15 51 };
wolpra98 0:b25367985a15 52
wolpra98 0:b25367985a15 53 void LCD::clear(void){
wolpra98 0:b25367985a15 54 command(LCD_CLEAR_DISPLAY );
wolpra98 0:b25367985a15 55 wait_ms( LCD_CLEAR_DISPLAY_MS );
wolpra98 0:b25367985a15 56 };
wolpra98 0:b25367985a15 57
wolpra98 0:b25367985a15 58 void LCD::home(void){
wolpra98 0:b25367985a15 59 command( LCD_CURSOR_HOME );
wolpra98 0:b25367985a15 60 wait_ms( LCD_CURSOR_HOME_MS );
wolpra98 0:b25367985a15 61 }
wolpra98 0:b25367985a15 62
wolpra98 0:b25367985a15 63 void LCD::data(unsigned char data){
wolpra98 0:b25367985a15 64 DigitalOut rs(_rs);
wolpra98 0:b25367985a15 65 rs = 1; // RS auf 1 setzen
wolpra98 0:b25367985a15 66 out(data>>4); // zuerst die oberen,
wolpra98 0:b25367985a15 67 out(data); // dann die unteren 4 Bit senden
wolpra98 0:b25367985a15 68 wait_us( LCD_WRITEDATA_US );
wolpra98 0:b25367985a15 69 }
wolpra98 0:b25367985a15 70
wolpra98 0:b25367985a15 71 // Schreibt einen String auf das LCD
wolpra98 0:b25367985a15 72 void LCD::string(const char *data){
wolpra98 0:b25367985a15 73 while( *data != '\0' )
wolpra98 0:b25367985a15 74 LCD::data( *data++ );
wolpra98 0:b25367985a15 75 }
wolpra98 0:b25367985a15 76
wolpra98 0:b25367985a15 77 // Setzt den Cursor in Spalte x (0..15) Zeile y (1..4)
wolpra98 0:b25367985a15 78 void LCD::setcursor(unsigned char x, unsigned char y )
wolpra98 0:b25367985a15 79 {
wolpra98 0:b25367985a15 80 unsigned char data;
wolpra98 0:b25367985a15 81 switch (y)
wolpra98 0:b25367985a15 82 {
wolpra98 0:b25367985a15 83 case 1: // 1. Zeile
wolpra98 0:b25367985a15 84 data = LCD_SET_DDADR + LCD_DDADR_LINE1 + x;
wolpra98 0:b25367985a15 85 break;
wolpra98 0:b25367985a15 86 case 2: // 2. Zeile
wolpra98 0:b25367985a15 87 data = LCD_SET_DDADR + LCD_DDADR_LINE2 + x;
wolpra98 0:b25367985a15 88 break;
wolpra98 0:b25367985a15 89 case 3: // 3. Zeile
wolpra98 0:b25367985a15 90 data = LCD_SET_DDADR + LCD_DDADR_LINE3 + x;
wolpra98 0:b25367985a15 91 break;
wolpra98 0:b25367985a15 92 case 4: // 4. Zeile
wolpra98 0:b25367985a15 93 data = LCD_SET_DDADR + LCD_DDADR_LINE4 + x;
wolpra98 0:b25367985a15 94 break;
wolpra98 0:b25367985a15 95 default:
wolpra98 0:b25367985a15 96 return; // für den Fall einer falschen Zeile
wolpra98 0:b25367985a15 97 }
wolpra98 0:b25367985a15 98 command(data);
wolpra98 0:b25367985a15 99 }
wolpra98 0:b25367985a15 100
wolpra98 0:b25367985a15 101 void LCD::out(unsigned char data){
wolpra98 0:b25367985a15 102 BusOut db(_db4, _db5, _db6, _db7);
wolpra98 0:b25367985a15 103 db = data; // Bits setzen
wolpra98 0:b25367985a15 104 enable();
wolpra98 0:b25367985a15 105 };
wolpra98 0:b25367985a15 106
wolpra98 0:b25367985a15 107 void LCD::enable(){
wolpra98 0:b25367985a15 108 DigitalOut en(_en);
wolpra98 0:b25367985a15 109 en = 1;
wolpra98 0:b25367985a15 110 wait_us( LCD_ENABLE_US ); // kurze Pause
wolpra98 0:b25367985a15 111 en = 0;
wolpra98 0:b25367985a15 112 };
wolpra98 0:b25367985a15 113
wolpra98 0:b25367985a15 114 void LCD::command(unsigned char data){
wolpra98 0:b25367985a15 115 DigitalOut rs(_rs);
wolpra98 0:b25367985a15 116 // RS auf 0 setzen
wolpra98 0:b25367985a15 117 rs = 0;
wolpra98 0:b25367985a15 118 out(data>>4); // zuerst die oberen,
wolpra98 0:b25367985a15 119 out(data); // dann die unteren 4 Bit senden
wolpra98 0:b25367985a15 120 wait_us( LCD_COMMAND_US );
wolpra98 0:b25367985a15 121 };
wolpra98 0:b25367985a15 122
wolpra98 0:b25367985a15 123
wolpra98 0:b25367985a15 124