Joachim Andersen
1
Diff: TextLCD.h
- Revision:
- 15:b70ebfffb258
- Parent:
- 14:0c32b66b14b8
- Child:
- 16:c276b75e6585
diff -r 0c32b66b14b8 -r b70ebfffb258 TextLCD.h
--- a/TextLCD.h Sun Feb 10 18:43:51 2013 +0000
+++ b/TextLCD.h Tue Feb 19 22:09:09 2013 +0000
@@ -1,7 +1,8 @@
/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
* Copyright (c) 2007-2010, sford, http://mbed.org
* 2013, v01: WH, Added LCD types, fixed LCD address issues, added Cursor and UDCs
- * 2013, v02: WH, Added I2C and SPI bus interfaces
+ * 2013, v02: WH, Added I2C and SPI bus interfaces
+ * 2013, v03: WH, Added support for LCD40x4 which uses 2 controllers
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -27,15 +28,20 @@
#include "mbed.h"
+
+//Test Only
+//#define LCD40x4Test 0
+#define LCD40x4Test 1
+
/** A TextLCD interface for driving 4-bit HD44780-based LCDs
*
- * Currently supports 8x1, 8x2, 16x2, 16x4, 20x2, 20x4, 24x2, 24x4 and 40x2 panels
+ * Currently supports 8x1, 8x2, 12x4, 16x1, 16x2, 16x4, 20x2, 20x4, 24x2, 24x4 and 40x2 panels
*
* @code
* #include "mbed.h"
* #include "TextLCD.h"
*
- * TextLCD lcd(p15, p16, p17, p18, p19, p20); // RS, E, D4-D7
+ * TextLCD lcd(p15, p16, p17, p18, p19, p20); // RS, E, D4-D7, LCDType=LCD16x2
*
* int main() {
* lcd.printf("Hello World!\n");
@@ -47,19 +53,20 @@
//Pin Defines for I2C PCF8574 and SPI 74595 Bus
//LCD and serial portexpanders should be wired accordingly
//Note: LCD RW pin must be connected to GND
-// E2 may be used for future expansion to LCD40x4
+// E2 is used for LCD40x4 (second controller)
// BL may be used for future expansion to control backlight
//
-#define D_LCD_PIN_D4 0x00
-#define D_LCD_PIN_D5 0x01
-#define D_LCD_PIN_D6 0x02
-#define D_LCD_PIN_D7 0x03
-#define D_LCD_PIN_RS 0x04
-#define D_LCD_PIN_E 0x05
-#define D_LCD_PIN_E2 0x06
-#define D_LCD_PIN_BL 0x07
+#define D_LCD_PIN_D4 0
+#define D_LCD_PIN_D5 1
+#define D_LCD_PIN_D6 2
+#define D_LCD_PIN_D7 3
+#define D_LCD_PIN_RS 4
+#define D_LCD_PIN_E 5
+#define D_LCD_PIN_E2 6
+#define D_LCD_PIN_BL 7
#define D_LCD_BUS_MSK 0x0F
+#define D_LCD_BUS_DEF 0x00
//Bitpattern Defines for I2C PCF8574 and SPI 74595 Bus
//
@@ -112,7 +119,7 @@
/** A TextLCD interface for driving 4-bit HD44780-based LCDs
*
- * Currently supports 8x1, 8x2, 16x1, 16x2, 16x4, 20x2, 20x4, 24x2, 24x4 and 40x2 panels
+ * Currently supports 8x1, 8x2, 12x4, 16x1, 16x2, 16x4, 20x2, 20x4, 24x2, 24x4, 40x2 and 40x4 panels
*
*/
class TextLCD : public Stream {
@@ -122,6 +129,8 @@
enum LCDType {
LCD8x1, /**< 8x1 LCD panel */
LCD8x2, /**< 8x2 LCD panel */
+ LCD12x2, /**< 12x2 LCD panel */
+ LCD12x4, /**< 12x4 LCD panel */
LCD16x1, /**< 16x1 LCD panel (actually 8x2) */
LCD16x2, /**< 16x2 LCD panel (default) */
LCD16x2B, /**< 16x2 LCD panel alternate addressing */
@@ -130,7 +139,8 @@
LCD20x4, /**< 20x4 LCD panel */
LCD24x2, /**< 24x2 LCD panel */
LCD24x4, /**< 24x4 LCD panel, special mode KS0078 */
- LCD40x2 /**< 40x2 LCD panel */
+ LCD40x2, /**< 40x2 LCD panel */
+ LCD40x4 /**< 40x4 LCD panel, Two controller version */
};
/** LCD Cursor control */
@@ -142,14 +152,15 @@
};
- /** Create a TextLCD interface for using regural mbed pins
+ /** Create a TextLCD interface for using regular mbed pins
*
* @param rs Instruction/data control line
* @param e Enable line (clock)
* @param d4-d7 Data lines for using as a 4-bit interface
* @param type Sets the panel size/addressing mode (default = LCD16x2)
+ * @param e2 Enable2 line (clock for second controller, LCD40x4 only)
*/
- TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2);
+ TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2, PinName e2 = NC);
/** Create a TextLCD interface using an I2C PC8574 portexpander
*
@@ -243,17 +254,32 @@
enum _LCDBus {
_PinBus, /*< Regular mbed pins */
_I2CBus, /*< I2C PCF8574 Portexpander */
- _SPIBus /*< SPI 74595 */
+ _SPIBus /*< SPI 74595 Shiftregister */
};
+ /* LCD controller select, mainly used for LCD40x4 */
+ enum _LCDCtrl {
+ _LCDCtrl_0, /*< Primary */
+ _LCDCtrl_1, /*< Secondary */
+ };
+
// Stream implementation functions
virtual int _putc(int value);
virtual int _getc();
+//Low level methods for LCD controller
void _init();
+ void _initCtrl();
int _address(int column, int row);
void _character(int column, int row, int c);
+ void _setCursor(TextLCD::LCDCursor show);
+ void _setUDC(unsigned char c, char *udc_data);
+//Low level write operations to LCD controller
+ void _writeByte(int value);
+ void _writeCommand(int command);
+ void _writeData(int data);
+
//Low level writes to LCD Bus (serial or parallel)
void _setEnable(bool value);
void _setRS(bool value);
@@ -263,13 +289,9 @@
//Low level writes to LCD serial bus only
void _writeBus();
-//Low level writes to LCD
- void _writeByte(int value);
- void _writeCommand(int command);
- void _writeData(int data);
// Regular mbed pins bus
- DigitalOut _rs, _e;
+ DigitalOut _rs, _e, _e2;
BusOut _d;
// I2C bus
@@ -283,16 +305,19 @@
//Bus Interface type
_LCDBus _busType;
-// Internal bus mirror value for serial only
+// Internal bus mirror value for serial bus only
char _lcd_bus;
//Display type
LCDType _type;
+//Controller select, mainly used for LCD40x4
+ _LCDCtrl _ctrl;
+
// Cursor
int _column;
int _row;
- LCDCursor _cursor;
+ LCDCursor _currentCursor;
};
#endif