Diff: TextLCD_SR4.h

Revision:

2:e768257aba09

Parent:

0:580f94424a91

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD_SR4.h	Mon Oct 25 22:41:56 2010 +0000
@@ -0,0 +1,96 @@
+
+#ifndef _TEXT_LCD_SR4_H
+#define _TEXT_LCD_SR4_H
+
+#include "mbed.h"
+
+/*
+ * Modified for http://mbed.org/users/shintamainjp/notebook/textlcd_sr4_en/
+ * Shinichiro Nakamura
+ */
+
+/**
+ * A TextLCD_SR4 interface for driving 4-bit HD44780-based LCDs with shift register.
+ *
+ * Currently supports 16x2, 20x2 and 20x4 panels
+ *
+ * @code
+ * #include "mbed.h"
+ * #include "TextLCD_SR4.h"
+ *
+ * TextLCD_SR4 lcd(p29, p30, p28, p27); // rs, e, dat, clk
+ *
+ * int main() {
+ *     lcd.printf("Hello World!\n");
+ * }
+ * @endcode
+ */
+class TextLCD_SR4 : public Stream {
+public:
+    /** LCD panel format */
+    enum LCDType {
+        LCD16x2     /**< 16x2 LCD panel (default) */
+        , LCD16x2B  /**< 16x2 LCD panel alternate addressing */
+        , LCD20x2   /**< 20x2 LCD panel */
+        , LCD20x4   /**< 20x4 LCD panel */
+    };
+    
+    /** Create a TextLCD_SR4 interface
+     *
+     * @param rs    Instruction/data control line
+     * @param e     Enable line (clock)
+     * @param dat   Data line
+     * @param clk   Clock line
+     */
+    TextLCD_SR4(PinName rs, PinName e, PinName dat, PinName clk, LCDType type = LCD16x2);
+
+#if DOXYGEN_ONLY
+    /** Write a character to the LCD
+     *
+     * @param c The character to write to the display
+     */
+    int putc(int c);
+
+    /** Write a formated string to the LCD
+     *
+     * @param format A printf-style format string, followed by the
+     *               variables to use in formating the string.
+     */
+    int printf(const char* format, ...);
+#endif
+
+    /** Locate to a screen column and row
+     *
+     * @param column  The horizontal position from the left, indexed from 0
+     * @param row     The vertical position from the top, indexed from 0
+     */
+    void locate(int column, int row);
+
+    /** Clear the screen and locate to 0,0 */
+    void cls();
+
+    int rows();
+    int columns();
+
+protected:
+
+    // Stream implementation functions
+    virtual int _putc(int value);
+    virtual int _getc();
+
+    int address(int column, int row);
+    void character(int column, int row, int c);
+    void writeByte(int value);
+    void writeCommand(int command);
+    void writeData(int data);
+
+    void writeToShiftRegister(int value);
+
+    DigitalOut _rs, _e, _dat, _clk;
+    LCDType _type;
+
+    int _column;
+    int _row;
+};
+
+#endif