Diff: OptrexLCD.cpp

Revision:

2:9e13bd7280e1

Parent:

0:ef7b6dec773f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OptrexLCD.cpp	Mon Nov 29 22:26:12 2010 +0000
@@ -0,0 +1,180 @@
+/* mbed TextLCD Library, for a 4-bit LCD based on Optrex DCM20481 NY-LY-ABE
+*
+* Copyright (c) 2007-2010, sford modified by E.Sjoukes
+*
+* 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 i
+* 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 "OptrexLCD.h"
+#include "mbed.h"
+
+// initialiseer  
+TextLCD::TextLCD(PinName rs, PinName e, PinName d0, PinName d1, PinName d2, 
+            PinName d3, LCDType type) : _rs(rs), _e(e), _d(d0, d1, d2, d3), _type(type) 
+{
+    _e  = 1;                // enable normaly high
+    _rs = 0;                // command mode
+ 
+    wait(0.015);            // Wait 15ms to ensure powered up
+
+    for (int i=0; i<3; i++) // send "Display Settings" 3 times
+    {
+        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();
+}
+ 
+void TextLCD::character(int column, int row, int c) 
+{
+    int a = address(column, row);
+    writeCommand(a);
+    writeData(c);
+}
+ 
+void TextLCD::cls() 
+{
+    writeCommand(0x01);    // cls, and set cursor to 0
+    wait(0.003000f);       // This command takes 3ms with Optrex, normaly it wood be 1.64ms
+    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(0.000040f);   // most instructions take 40us
+     _e = 0;
+     wait(0.000075f);   // enable puls of Optrex needs to be 75us 
+     _e = 1;
+     _d = value >> 0;
+     wait(0.000075f);   // enable puls of Optrex needs to be 75us
+     _e = 0;
+     wait(0.000075f);   // enable puls of Optrex needs to be 75us
+     _e = 1;
+}
+ 
+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;
+     }
+}