#ifndef _DISPLAY_H_DEF_
#define _DISPLAY_H_DEF_

	#define DSP_MEMORYMODE          0x20 ///< See datasheet
	#define DSP_COLUMNADDR          0x21 ///< See datasheet
	#define DSP_PAGEADDR            0x22 ///< See datasheet
	#define DSP_SETCONTRAST         0x81 ///< See datasheet
	#define DSP_CHARGEPUMP          0x8D ///< See datasheet
	#define DSP_SEGREMAP            0xA0 ///< See datasheet
	#define DSP_DISPLAYALLON_RESUME 0xA4 ///< See datasheet
	#define DSP_DISPLAYALLON        0xA5 ///< Not currently used
	#define DSP_NORMALDISPLAY       0xA6 ///< See datasheet
	#define DSP_INVERTDISPLAY       0xA7 ///< See datasheet
	#define DSP_SETMULTIPLEX        0xA8 ///< See datasheet
	#define DSP_DISPLAYOFF          0xAE ///< See datasheet
	#define DSP_DISPLAYON           0xAF ///< See datasheet
	#define DSP_COMSCANINC          0xC0 ///< Not currently used
	#define DSP_COMSCANDEC          0xC8 ///< See datasheet
	#define DSP_SETDISPLAYOFFSET    0xD3 ///< See datasheet
	#define DSP_SETDISPLAYCLOCKDIV  0xD5 ///< See datasheet
	#define DSP_SETPRECHARGE        0xD9 ///< See datasheet
	#define DSP_SETCOMPINS          0xDA ///< See datasheet
	#define DSP_SETVCOMDETECT       0xDB ///< See datasheet

	#define DSP_SETLOWCOLUMN        0x00 ///< Not currently used
	#define DSP_SETHIGHCOLUMN       0x10 ///< Not currently used
	#define DSP_SETSTARTLINE        0x40 ///< See datasheet

	#define DSP_EXTERNALVCC         0x01 ///< External display voltage source
	#define DSP_SWITCHCAPVCC        0x02 ///< Gen. display voltage from 3.3V

	#define DSP_RIGHT_HORIZONTAL_SCROLL              0x26 ///< Init rt scroll
	#define DSP_LEFT_HORIZONTAL_SCROLL               0x27 ///< Init left scroll
	#define DSP_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29 ///< Init diag scroll
	#define DSP_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL  0x2A ///< Init diag scroll
	#define DSP_DEACTIVATE_SCROLL                    0x2E ///< Stop scroll
	#define DSP_ACTIVATE_SCROLL                      0x2F ///< Start scroll
	#define DSP_SET_VERTICAL_SCROLL_AREA             0xA3 ///< Set scroll range

	class Display {
		public:
			void Display(const uint8_t width=128, const uint8_t height=32, const resetPin=-1);
			void begin();
			void clear();

		protected:
			void send_command(const uint8_t c);
			void send_commands(const uint8_t *cc, const uint8_t n);
		private:
			const uint8_t _width    { 128  };
			const uint8_t _height   { 32   };
			const uint8_t _comPin   { 0x02 };
			const uint8_t _i2caddr  { 0x3C };
			const uint8_t _contrast { 0x8F };
			uint8_t  _rstPin { -1   };
			TwoWire* _wire   { nullptr };
	};

#endif