lcd: resolve #4

LiquidCrystal/inc/LiquidCrystal.h

@@ -0,0 +1,97 @@
+#ifndef LiquidCrystal_h
+#define LiquidCrystal_h
+
+
+#include <cstddef>
+#include <string>
+#include "chip.h"
+#include "DigitalIoPin.h"
+
+// commands
+#define LCD_CLEARDISPLAY 0x01
+#define LCD_RETURNHOME 0x02
+#define LCD_ENTRYMODESET 0x04
+#define LCD_DISPLAYCONTROL 0x08
+#define LCD_CURSORSHIFT 0x10
+#define LCD_FUNCTIONSET 0x20
+#define LCD_SETCGRAMADDR 0x40
+#define LCD_SETDDRAMADDR 0x80
+
+// flags for display entry mode
+#define LCD_ENTRYRIGHT 0x00
+#define LCD_ENTRYLEFT 0x02
+#define LCD_ENTRYSHIFTINCREMENT 0x01
+#define LCD_ENTRYSHIFTDECREMENT 0x00
+
+// flags for display on/off control
+#define LCD_DISPLAYON 0x04
+#define LCD_DISPLAYOFF 0x00
+#define LCD_CURSORON 0x02
+#define LCD_CURSOROFF 0x00
+#define LCD_BLINKON 0x01
+#define LCD_BLINKOFF 0x00
+
+// flags for display/cursor shift
+#define LCD_DISPLAYMOVE 0x08
+#define LCD_CURSORMOVE 0x00
+#define LCD_MOVERIGHT 0x04
+#define LCD_MOVELEFT 0x00
+
+// flags for function set
+#define LCD_8BITMODE 0x10
+#define LCD_4BITMODE 0x00
+#define LCD_2LINE 0x08
+#define LCD_1LINE 0x00
+#define LCD_5x10DOTS 0x04
+#define LCD_5x8DOTS 0x00
+
+class LiquidCrystal {
+public:
+
+  LiquidCrystal(DigitalIoPin *rs,  DigitalIoPin *enable,
+			    DigitalIoPin *d0, DigitalIoPin *d1, DigitalIoPin *d2, DigitalIoPin *d3);
+
+  void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
+
+  void clear();
+  void home();
+
+  void noDisplay();
+  void display();
+  void noBlink();
+  void blink();
+  void noCursor();
+  void cursor();
+  void scrollDisplayLeft();
+  void scrollDisplayRight();
+  void leftToRight();
+  void rightToLeft();
+  void autoscroll();
+  void noAutoscroll();
+
+  void createChar(uint8_t, uint8_t[]);
+  void setCursor(uint8_t, uint8_t);
+  virtual size_t write(uint8_t);
+  void command(uint8_t);
+  void print(std::string const &s);
+  void print(const char *s);
+
+private:
+  void send(uint8_t, uint8_t);
+  void write4bits(uint8_t);
+  void pulseEnable();
+
+  DigitalIoPin *rs_pin; // LOW(false): command.  HIGH(true): character.
+  DigitalIoPin *enable_pin; // activated by a HIGH pulse.
+  DigitalIoPin *data_pins[4];
+
+  uint8_t _displayfunction;
+  uint8_t _displaycontrol;
+  uint8_t _displaymode;
+
+  uint8_t _initialized;
+
+  uint8_t _numlines,_currline;
+};
+
+#endif