Diff: LCD.cpp

Revision:

0:b25367985a15

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LCD.cpp	Thu Apr 30 10:35:52 2015 +0000
@@ -0,0 +1,124 @@
+
+
+#include "mbed.h"
+#include "LCD.h"
+
+LCD::LCD(PinName RS, PinName EN, PinName DB4, PinName DB5, PinName DB6, PinName DB7){
+    _rs = RS;
+    _en = EN;
+    _db4 = DB4;
+    _db5 = DB5;
+    _db6 = DB6;
+    _db7 = DB7;
+    DigitalOut rs(RS);    
+    DigitalOut en(EN);
+    BusOut db(DB4, DB5, DB6, DB7);
+    
+     // warten auf die Bereitschaft des LCD
+    wait_ms( LCD_BOOTUP_MS );
+ 
+    // Soft-Reset muss 3mal hintereinander gesendet werden zur Initialisierung
+    out( LCD_SOFT_RESET );
+    wait_ms( LCD_SOFT_RESET_MS1 );
+    enable();
+    wait_ms( LCD_SOFT_RESET_MS2 );
+    enable();
+    wait_ms( LCD_SOFT_RESET_MS3 );
+ 
+    // 4-bit Modus aktivieren 
+    out( LCD_SET_FUNCTION |
+             LCD_FUNCTION_4BIT );
+    wait_ms( LCD_SET_4BITMODE_MS );
+ 
+    // 4-bit Modus / 2 Zeilen / 5x7
+    command( LCD_SET_FUNCTION |
+                 LCD_FUNCTION_4BIT |
+                 LCD_FUNCTION_2LINE |
+                 LCD_FUNCTION_5X7 );
+ 
+    // Display ein / Cursor aus / Blinken aus
+    command( LCD_SET_DISPLAY |
+                 LCD_DISPLAY_ON |
+                 LCD_CURSOR_ON |
+                 LCD_BLINKING_OFF); 
+ 
+    // Cursor inkrement / kein Scrollen
+    command( LCD_SET_ENTRY |
+                 LCD_ENTRY_INCREASE |
+                 LCD_ENTRY_NOSHIFT );
+ 
+    clear();   
+};
+
+void LCD::clear(void){
+    command(LCD_CLEAR_DISPLAY );
+    wait_ms( LCD_CLEAR_DISPLAY_MS );   
+};
+
+void LCD::home(void){
+    command( LCD_CURSOR_HOME );
+    wait_ms( LCD_CURSOR_HOME_MS );   
+}
+
+void LCD::data(unsigned char data){
+    DigitalOut rs(_rs);
+    rs = 1;    // RS auf 1 setzen
+    out(data>>4);            // zuerst die oberen, 
+    out(data);         // dann die unteren 4 Bit senden
+    wait_us( LCD_WRITEDATA_US );    
+}
+
+// Schreibt einen String auf das LCD
+void LCD::string(const char *data){
+    while( *data != '\0' )
+        LCD::data( *data++ );   
+}
+
+// Setzt den Cursor in Spalte x (0..15) Zeile y (1..4) 
+void LCD::setcursor(unsigned char x, unsigned char y )
+{
+    unsigned char data;
+    switch (y)
+    {
+        case 1:    // 1. Zeile
+            data = LCD_SET_DDADR + LCD_DDADR_LINE1 + x;
+            break;
+        case 2:    // 2. Zeile
+            data = LCD_SET_DDADR + LCD_DDADR_LINE2 + x;
+            break;
+        case 3:    // 3. Zeile
+            data = LCD_SET_DDADR + LCD_DDADR_LINE3 + x;
+            break;
+        case 4:    // 4. Zeile
+            data = LCD_SET_DDADR + LCD_DDADR_LINE4 + x;
+            break;
+        default:
+            return;                                   // für den Fall einer falschen Zeile
+    }
+    command(data);
+}
+
+void LCD::out(unsigned char data){
+    BusOut db(_db4, _db5, _db6, _db7);
+    db = data;     // Bits setzen
+    enable();    
+};
+
+void LCD::enable(){
+    DigitalOut en(_en);
+    en = 1;
+    wait_us( LCD_ENABLE_US );  // kurze Pause
+    en = 0;
+};
+
+void LCD::command(unsigned char data){
+    DigitalOut rs(_rs);
+    // RS auf 0 setzen
+    rs = 0;
+    out(data>>4);             // zuerst die oberen, 
+    out(data);           // dann die unteren 4 Bit senden
+    wait_us( LCD_COMMAND_US );   
+};
+
+
+