Diff: I2CTextLCD.h

Revision:

0:9218cf335f9b

Child:

1:0eb3365ec819

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/I2CTextLCD.h	Sat Dec 18 20:06:14 2010 +0000
@@ -0,0 +1,139 @@
+/* mbed I2CTextLCD Library
+ * Copyright (c) 2007-2009 sford
+ * Copyright (c) 2010 Wim De Roeve  changed to work with I2C PCF8575
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+
+#ifndef MBED_I2CTextLCD_H
+#define MBED_I2CTextLCD_H
+
+#include "mbed.h"
+#include "Stream.h"
+
+/* The code assumes the following connections between the PCF8575
+* and the LCD
+*
+* nc  - D0
+* nc  - D1
+* nc  - D2
+* nc  - D3
+* P0  - D4
+* P1  - D5
+* P2  - D6
+* P3  - D7
+* P4  - E
+* P5  - nc
+* P6  - nc
+* P7  - RS
+* gnd - R/W
+
+*/
+
+#define E_ON  0x10  //P4
+#define RS_ON 0x80  //P7
+
+namespace mbed {
+
+/* Class: I2CTextLCD
+ * 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 "I2CTextLCD.h"
+ * >
+ * > I2CTextLCD lcd(p9, P10, 0x40); // sda scl, address
+ * >
+ * > int main() {
+ * >     lcd.printf("Hello World!");
+ * > }
+ */
+class I2CTextLCD : public Stream {
+
+public:
+    /* Constructor: I2CTextLCD
+     * Create a I2CTextLCD 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
+     */
+
+    I2CTextLCD(PinName sda, PinName scl, int address, 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, bool rs);
+    void writeNibble(int value, bool rs);
+    void writeI2CByte(int data);
+    virtual int _putc(int c);
+    virtual int _getc();
+    virtual void newline();
+
+    int _row;
+    int _column;
+    int _columns;
+    int _rows;
+
+    I2C _i2c;
+    int _i2cAddress;
+        
+private:
+
+   
+
+};
+
+}
+
+#endif
+
+