Driver for OLED displays with SSD1306 or SH1106

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This driver is distributed without license. You may use it for free. Author: Stefan Frings, 2017

Update by: Author: Fabio Durigon, 2018 email: develop@dury.it

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Futures:

• Supported display sizes: 196x16, 28x32 and 128x64 pixels.
• The I2C communication is done by software bit-banging the configurable I/O pins.
• Supports all print() and write() calls as the internal Serial lib of Arduino core
• Supports also standard C/C++ printf() function
• Added printf(x,y,...) to print directly at x,y coordinate with one call
• Some special characters are handled like in unix mode: '\n' or '\r' -> The cursor is moved to the begin of next line '\r' and '\n' consecutive (also inverted) acts as a single one so -> The cursor is moved to the begin of next line '\f' like line-feed scroll up entire page.
• TTY mode:
  • Display can be used like a terminal window (without positioning the cursor before print).
  • Any call to setCursor() has no effect
  • When the cursor position reach the bottom of the screen, the page is scrolled up by one line.

Limitations:

• This driver supports only displays with internal charge pump and I2C interface.
• Communication errors are not handled.

How to use:

Declaration

The class constructor declaration is:

OLED(	uint8_t sda_pin,			// sda pin for I2C comunication
	uint8_t scl_pin,			// scl pin for I2C comunication
	uint8_t reset_pin=NO_RESET_PIN,		// Reset pin (default: none)
	uint8_t i2c_address=0x3C,		// I2C address (default: 0x3C)
	uint_fast8_t width=128,			// Pixel width
	uint_fast8_t height=32,			// Pixel Height
	bool isSH1106=false			// Display type: true for SSD1306, false for SH1106 (default: false)  
);

so, minimal class declarations can be:

OLED Display=OLED(4,5,16);

that's same of:

OLED Display=OLED(4,5,16,0x3C,128,32,false);

That's for OLED display mounted directly on NodeMCU WiFi_KIT_8 model from Heltec (http://www.heltec.cn/project/wifi-kit-8/?lang=en)

Initialize display lib like Serial artuino lib:

display.begin();

Write a string:

/* Method 1 */
display.draw_string(0,0,"Hello World");

/* Method 2 */
display.setCursor(0,0);
display.print("Hello World");

/* Method 3 */
display.printf(0,0,"Hello World");

/* Method 4 */
display.setCursor(0,0);
display.printf("Hello World");