Diff: TextLCD.h

Revision:

0:680c4f0d8664

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.h	Mon Jul 19 21:30:25 2010 +0000
@@ -0,0 +1,109 @@
+/* mbed TextLCD Library
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+ 
+#ifndef MBED_TEXTLCD_H
+#define MBED_TEXTLCD_H
+
+#include "Stream.h"
+#include "DigitalOut.h"
+#include "BusOut.h"
+
+namespace mbed {
+
+/* Class: TextLCD
+ * A 16x2 Text LCD controller
+ *
+ * Allows you to print to a Text LCD screen, and locate/cls. Could be
+ * turned in to a more generic libray.
+ *
+ * If you are connecting multiple displays, you can connect them all in
+ * parallel except for the enable (e) pin, which must be unique for each
+ * display.
+ *
+ * Example:
+ * > #include "mbed.h"
+ * > #include "TextLCD.h"
+ * >
+ * > TextLCD lcd(p24, p25, p26, p27, p28, p29, p30); // rs, rw, e, d0, d1, d2, d3
+ * >
+ * > int main() {
+ * >     lcd.printf("Hello World!");
+ * > }
+ */
+class TextLCD : public Stream {
+
+public:
+    /* Constructor: TextLCD
+     * Create a TextLCD object, connected to the specified pins
+     *
+     * All signals must be connected to DigitalIn compatible pins. 
+     *
+     * Variables:
+     *  rs -  Used to specify data or command
+     *  rw - Used to determine read or write
+     *  e - enable
+     *  d0..d3 - The data lines
+     */
+	TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1, 
+		PinName d2, PinName d3, int columns = 16, int rows = 2);
+
+#if 0 // Inhereted from Stream, for documentation only
+    /* Function: putc
+     *  Write a character
+     *
+     * Variables:
+     *  c - The character to write to the serial port
+     */
+    int putc(int c);
+
+    /* Function: printf
+     *  Write a formated string
+     *
+     * Variables:
+     *  format - A printf-style format string, followed by the
+     *      variables to use in formating the string.
+     */
+    int printf(const char* format, ...);
+#endif
+        
+    /* Function: locate
+     * Locate to a certian position
+     *
+     * Variables:
+     *  column - the column to locate to, from 0..15
+     *  row - the row to locate to, from 0..1
+     */
+	virtual void locate(int column, int row);
+    
+    /* Function: cls
+     * Clear the screen, and locate to 0,0
+     */
+	virtual void cls();	
+    
+	virtual void reset();
+		
+protected:
+
+	void clock();
+	void writeData(int data);
+	void writeCommand(int command);
+	void writeByte(int value);
+	void writeNibble(int value);
+	virtual int _putc(int c);		
+	virtual int _getc();
+	virtual void newline();				
+			
+	int _row;
+	int _column;	
+	DigitalOut _rw, _rs, _e;
+	BusOut _d;
+	int _columns;
+	int _rows;
+
+};
+
+}
+
+#endif