Diff: myTextLCD.cpp

Revision:

9:87fdf4a45de7

Parent:

7:44f34c09bd37

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/myTextLCD.cpp	Sat Jan 03 15:26:34 2015 +0000
@@ -0,0 +1,299 @@
+/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
+ * Copyright (c) 2007-2010, sford, http://mbed.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "myTextLCD.h"
+#include "mbed.h"
+#include "MODSERIAL.h"
+
+extern MODSERIAL pc;                    // definiert in main
+
+TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
+                 PinName d6, PinName d7, LCDType type) : _rs(rs),
+        _e(e), _d(d4, d5, d6, d7),
+        _type(type) {
+
+    _e  = 1;
+    _rs = 0;            // command mode
+    _type = LCD16x2;
+    
+    // die Anzeige soll hier zwischengespeichert werden
+    for(int i = 0; i < 16; i++)
+    {
+        zeile1_text[i] = 0x20; // Leerzeichen
+        zeile2_text[i] = 0x20; // Leerzeichen
+        zeile1_flag[i] = false;
+        zeile2_flag[i] = false;   
+    }
+    
+    lcd_flag = true;
+    
+    wait(0.015);        // Wait 15ms to ensure powered up
+
+    // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
+    for (int i=0; i<3; i++) {
+        writeByte(0x3);
+        wait(0.00164);  // this command takes 1.64ms, so wait for it
+    }
+    writeByte(0x2);     // 4-bit mode
+    wait(0.000040f);    // most instructions take 40us
+
+    writeCommand(0x28); // Function set 001 BW N F - -
+    writeCommand(0x0C);
+    writeCommand(0x6);  // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
+    cls();
+}
+
+//---------------------------------------------------
+// in der Phase, wo die LCD Anzeige von einer Eingabe
+// benötigt wird, kann mit diesem Falg die Ausgabe
+// abgeschaltet werden.
+
+void TextLCD::set_lcd_flag(bool flag)
+{
+   lcd_flag = flag; 
+}
+
+// hier werden die Daten in die LCD Anzeige geschrieben
+// im neuen Ablauf werden hier die Daten in die Variable geschrieben
+
+void TextLCD::character(int column, int row, int c) 
+{
+    
+    if (row == 0)
+    { 
+      if (zeile1_text[column] != c)
+      {
+        zeile1_text[column] = c;
+        zeile1_flag[column] = true;   
+      }  
+    }
+    else
+    {
+      if (zeile2_text[column] != c)
+      {
+        zeile2_text[column] = c;
+        zeile2_flag[column] = true;          
+      }         
+    }
+}
+
+// -----------------------------------------------------
+// den Text im Speicher auf die LCD Anzeige ausgeben
+
+void TextLCD::writeLCD()
+{
+    int i;
+    
+    if (lcd_flag)
+    {
+        // Text auf Zeile 1 ausgeben
+        for (i = 0; i<16; i++)
+        {
+            if (zeile1_flag[i])
+            {   
+                int a = address(i, 0);
+                writeCommand(a);
+                writeData(zeile1_text[i]);
+                zeile1_flag[i] = false;
+            }
+        }
+        
+        // Text auf Zeile 2 ausgeben
+        for (i = 0; i<16; i++)
+        {
+            if (zeile2_flag[i])
+            {   
+                int a = address(i, 1);
+                writeCommand(a);
+                writeData(zeile2_text[i]);
+                zeile2_flag[i] = false;
+            }
+        }
+    }   
+}
+
+// --------------------------------------------------------
+// Nachdem die LCD Anzeige wieder die Freigabe bekommt
+// wird der ganze Speicher auf die LCD Anzeige ausgeben
+//
+void TextLCD::writeALL()
+{
+    int i, a;
+    
+    // Text auf Zeile 1 ausgeben
+    a = address(0, 0);
+    writeCommand(a);
+    wait_us(40);
+    
+    for (i = 0; i<16; i++)
+    {
+        writeData(zeile1_text[i]);
+        zeile1_flag[i] = false;
+    }
+    
+    // Text auf Zeile 2 ausgeben
+    
+    a = address(0, 1);
+    writeCommand(a);    
+    wait_us(40);
+    
+    for (i = 0; i<16; i++)
+    {
+         writeData(zeile2_text[i]);
+         zeile2_flag[i] = false;
+    } 
+    
+    // Text auf Zeile 1 ausgeben
+    a = address(0, 0);
+    writeCommand(a);
+    wait_us(40);  
+}
+
+void TextLCD::cls() 
+{
+    writeCommand(0x01); // cls, and set cursor to 0
+    wait(0.00164f);     // This command takes 1.64 ms
+    locate(0, 0);
+    
+}
+
+void TextLCD::locate(int column, int row) 
+{
+    _column = column;
+    _row = row;
+}
+
+int TextLCD::_putc(int value) 
+{
+    if (value == '\n') {
+        _column = 0;
+        _row++;
+        if (_row >= rows()) {
+            _row = 0;
+        }
+    } else {
+        character(_column, _row, value);
+        _column++;
+        if (_column >= columns()) {
+            _column = 0;
+            _row++;
+            if (_row >= rows()) {
+                _row = 0;
+            }
+        }
+    }
+    return value;
+}
+
+int TextLCD::_getc() {
+    return -1;
+}
+
+void TextLCD::writeByte(int value) 
+{
+    _d = value >> 4;
+    wait_us(1); 
+    _e = 0;
+    wait_us(40);    
+    _e = 1;
+    _d = value >> 0;
+    wait_us(1);
+    _e = 0;
+    wait_us(40); 
+    _e = 1;
+    wait_us(42);    // most instructions take 40us   
+}
+
+void TextLCD::writeCommand(int command) 
+{
+    _rs = 0;
+    writeByte(command);
+}
+
+void TextLCD::writeData(int data) 
+{
+    _rs = 1;
+    writeByte(data);
+}
+
+int TextLCD::address(int column, int row) 
+{
+    switch (_type) {
+        case LCD20x4:
+            switch (row) {
+                case 0:
+                    return 0x80 + column;
+                case 1:
+                    return 0xc0 + column;
+                case 2:
+                    return 0x94 + column;
+                case 3:
+                    return 0xd4 + column;
+            }
+        case LCD16x2B:
+            return 0x80 + (row * 40) + column;
+        case LCD16x2:
+        case LCD20x2:
+        default:
+            return 0x80 + (row * 0x40) + column;
+    }
+}
+
+int TextLCD::columns() 
+{
+    switch (_type) {
+        case LCD20x4:
+        case LCD20x2:
+            return 20;
+        case LCD16x2:
+        case LCD16x2B:
+        default:
+            return 16;
+    }
+}
+
+int TextLCD::rows() 
+{
+    switch (_type) {
+        case LCD20x4:
+            return 4;
+        case LCD16x2:
+        case LCD16x2B:
+        case LCD20x2:
+        default:
+            return 2;
+    }
+}
+
+void TextLCD::print_LCD(char* Pbuffer,char line_num, char offset)
+{
+    unsigned int i=0;
+    
+    int a = address(offset,line_num);
+    writeCommand(a);
+    
+    while (Pbuffer[i] !=  0)
+    {
+        writeData(Pbuffer[i]);  
+        i++;    
+    }
+}
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