Diff: lc_display.h

Revision:

0:1f9875adab5d

Child:

2:67c271b56755

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lc_display.h	Thu Jan 16 21:48:38 2014 +0000
@@ -0,0 +1,196 @@
+/*
+ * Copyright (c) 2011 Paul van der Wielen, Pro-Serv
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to use
+ * and implement the software for none commercial reason and usage only and
+ * 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.
+ *
+ * Usage and assumptions:
+ * coding as to interface an I2C LC Display modle available from:
+ * Coptonix GmbH
+ * Berlin 24.06.2008by @ less than Euro 13.-
+  * which will interface to various HD44780 based units, 8Bit-Interface (16x2 or 20x4)
+ *
+ * Used device = LPC1768
+ */
+#include "mbed.h"
+
+#define I2C_ADDR 0xfe
+#define I2C_SPEED 400000
+
+#define ClrDisplay 0x61
+#define ReturnHome 0x62
+#define SetCursor 0x63
+#define CharToLCD 0x64
+#define CMDToLCD 0x65
+#define Delete 0x66
+#define CopyToClipBoard 0x67
+#define Paste 0x68
+#define GetCursorAdr 0x69
+#define GetCharAtCur 0x6a
+#define ReadRam 0x6b
+#define DisplayON_OFF 0x6c
+#define Shift 0x6d
+#define SetEntryMode 0x6e
+#define SetFunction 0x6f
+#define SetCGRAMAdr 0x70
+#define SetGGRAMAdr 0x71
+#define SaveLCDIni 0x73
+#define WriteUserDefChar 0x74
+#define SaveUserDefChr 0x75
+#define WriteString 0x76
+#define LCDType 0x77
+  
+I2C i2c(p28, p27);
+
+void _InitLCD();
+int  _ReadLCD(int Cmd);
+void _WriteLCD(int Cmd, int par1, int par2, int par3);
+void _WriteLCD(int Cmd, int par1, int par2);
+void _WriteLCD(int Cmd, int par1);
+void _WriteLCD(int Cmd);
+void _WriteLCD(int Cmd, char *par1, int par2);
+
+void _InitLCD() {
+    i2c.frequency(I2C_SPEED);
+}
+
+int _ReadLCD(int Cmd) {
+
+int j = 50;
+
+    char data[2];
+    i2c.start();
+    i2c.write(I2C_ADDR);
+    i2c.write(Cmd & 0xff);
+    i2c.read(I2C_ADDR, data, 2);
+    i2c.stop();
+    wait_us(j);
+    return data[1];
+}
+
+void _WriteLCD(int Cmd, int par1, int par2, int par3) {
+
+int j = 50;
+
+    i2c.start();
+    i2c.write(I2C_ADDR);
+    i2c.write(Cmd & 0xff);          // Set Command
+    switch (Cmd) { 
+        case DisplayON_OFF :
+            i2c.write(0x08 + ((par1 & 0x01) << 2) + ((par2 & 0x01) << 1) + (par3 & 0x01));  // 0x00/0x01 for display, cursor and blinking
+            break;
+        case SetFunction :
+            i2c.write(0x20 + ((par1 & 0x01) << 4) + ((par2 & 0x01) << 3) + ((par3 & 0x01) << 2));  // 0x00/0x01 for interface, lines and dots
+            break;
+        case Delete :
+            j = 1000;
+        case CopyToClipBoard :
+            i2c.write(par1);        // line 1-4
+            i2c.write(par2);        // position 1-20
+            i2c.write(par3);        // count 1-20
+            break;
+        default :
+            break;
+    }
+        
+    i2c.stop();
+    wait_us(j);
+}
+
+void _WriteLCD(int Cmd, int par1, int par2) {
+
+int j = 50;
+
+    i2c.start();
+    i2c.write(I2C_ADDR);
+    i2c.write(Cmd & 0xff);          // Set Command
+    switch (Cmd) {
+        case Shift :
+            i2c.write(0x10 + ((par1 & 0x01) << 3) + ((par2 & 0x01) << 2));                  // 0x00/0x01 cursor or display, 0x00/0x01 left or right
+            break;
+        case SetEntryMode :
+            i2c.write(0x04 + ((par1 & 0x01) << 1) + (par2 & 0x01));                         // 0x00/0x01 for cursor move (increase / decrease), display (shifted / not shifted)
+            break;
+        default :
+            break;
+    }
+        
+    i2c.stop();
+    wait_us(j);
+}
+
+void _WriteLCD(int Cmd, int par1) {
+
+int j = 50;
+
+    i2c.start();
+    i2c.write(I2C_ADDR);
+    i2c.write(Cmd & 0xff);          // Set Command
+    switch (Cmd) {
+        case SetCursor :
+            j = 500;
+        case CharToLCD :
+        case CMDToLCD :
+        case SetCGRAMAdr :
+        case SetGGRAMAdr :
+            i2c.write(par1 & 0xff);                                                         // Put character at cursor position
+            break;
+        case SaveUserDefChr :
+            i2c.write(par1 & 0x07);                                                         // Save user defined character 0-7
+            break;
+        case LCDType :
+            i2c.write(par1 & 0x01);                                                         // set LCD type 0 = 4 x 16, 1 = 2 x 20
+            break;
+        default :
+            break;
+    }
+        
+    i2c.stop();
+    wait_us(j);
+}
+
+void _WriteLCD(int Cmd) {
+
+int j = 50;
+
+    i2c.start();
+    i2c.write(I2C_ADDR);
+    i2c.write(Cmd & 0xff);          // Set Command
+    switch (Cmd) {
+        case ClrDisplay :
+            j = 2000;
+            break;
+        default :
+            break;
+    }   
+    i2c.stop();
+    wait_us(j);
+}
+
+void _WriteLCD(int Cmd, char *par1, int par2) {
+// par2 maintained in call but no longer used 
+int i;
+int j = 1000;
+
+    i2c.start();
+    i2c.write(I2C_ADDR);
+    i2c.write(Cmd & 0xff);          // Set Command
+    for (i = 0; i < strlen(par1); i++) {
+        i2c.write(par1[i]);
+    }
+    i2c.stop();
+    wait_us(j);
+}