Diff: Adafruit_GFX/Adafruit_SSD1306.h

Revision:

1:0e75de2a5d21

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Adafruit_GFX/Adafruit_SSD1306.h	Mon Jun 13 02:21:11 2016 +0000
@@ -0,0 +1,220 @@
+/*********************************************************************
+This is a library for our Monochrome OLEDs based on SSD1306 drivers
+
+  Pick one up today in the adafruit shop!
+  ------> http://www.adafruit.com/category/63_98
+
+These displays use SPI to communicate, 4 or 5 pins are required to  
+interface
+
+Adafruit invests time and resources providing this open source code, 
+please support Adafruit and open-source hardware by purchasing 
+products from Adafruit!
+
+Written by Limor Fried/Ladyada  for Adafruit Industries.  
+BSD license, check license.txt for more information
+All text above, and the splash screen must be included in any redistribution
+*********************************************************************/
+
+/*
+ *  Modified by Neal Horman 7/14/2012 for use in mbed
+ */
+
+#ifndef _ADAFRUIT_SSD1306_H_
+#define _ADAFRUIT_SSD1306_H_
+
+#include "mbed.h"
+#include "Adafruit_GFX.h"
+
+#include <vector>
+#include <algorithm>
+
+// A DigitalOut sub-class that provides a constructed default state
+class DigitalOut2 : public DigitalOut
+{
+public:
+	DigitalOut2(PinName pin, bool active = false) : DigitalOut(pin) { write(active); };
+	DigitalOut2& operator= (int value) { write(value); return *this; };
+	DigitalOut2& operator= (DigitalOut2& rhs) { write(rhs.read()); return *this; };
+	operator int() { return read(); };
+};
+
+#define SSD1306_EXTERNALVCC 0x1
+#define SSD1306_SWITCHCAPVCC 0x2
+
+/** The pure base class for the SSD1306 display driver.
+ *
+ * You should derive from this for a new transport interface type,
+ * such as the SPI and I2C drivers.
+ */
+class Adafruit_SSD1306 : public Adafruit_GFX
+{
+public:
+	Adafruit_SSD1306(PinName RST, uint8_t rawHeight = 32, uint8_t rawWidth = 128)
+		: Adafruit_GFX(rawWidth,rawHeight)
+		, rst(RST,false)
+	{
+		buffer.resize(rawHeight * rawWidth / 8);
+	};
+
+	void begin(uint8_t switchvcc = SSD1306_SWITCHCAPVCC);
+	
+	// These must be implemented in the derived transport driver
+	virtual void command(uint8_t c) = 0;
+	virtual void data(uint8_t c) = 0;
+	virtual void drawPixel(int16_t x, int16_t y, uint16_t color);
+
+	/// Clear the display buffer    
+	void clearDisplay(void);
+	virtual void invertDisplay(bool i);
+
+	/// Cause the display to be updated with the buffer content.
+	void display();
+	/// Fill the buffer with the AdaFruit splash screen.
+	virtual void splash();
+    
+protected:
+	virtual void sendDisplayBuffer() = 0;
+	DigitalOut2 rst;
+
+	// the memory buffer for the LCD
+	std::vector<uint8_t> buffer;
+};
+
+
+/** This is the SPI SSD1306 display driver transport class
+ *
+ */
+class Adafruit_SSD1306_Spi : public Adafruit_SSD1306
+{
+public:
+	/** Create a SSD1306 SPI transport display driver instance with the specified DC, RST, and CS pins, as well as the display dimentions
+	 *
+	 * Required parameters
+	 * @param spi - a reference to an initialized SPI object
+	 * @param DC (Data/Command) pin name
+	 * @param RST (Reset) pin name
+	 * @param CS (Chip Select) pin name
+	 *
+	 * Optional parameters
+	 * @param rawHeight - the vertical number of pixels for the display, defaults to 32
+	 * @param rawWidth - the horizonal number of pixels for the display, defaults to 128
+	 */
+	Adafruit_SSD1306_Spi(SPI &spi, PinName DC, PinName RST, PinName CS, uint8_t rawHieght = 32, uint8_t rawWidth = 128)
+	    : Adafruit_SSD1306(RST, rawHieght, rawWidth)
+	    , cs(CS,true)
+	    , dc(DC,false)
+	    , mspi(spi)
+	    {
+		    begin();
+		    splash();
+		    display();
+	    };
+
+	virtual void command(uint8_t c)
+	{
+	    cs = 1;
+	    dc = 0;
+	    cs = 0;
+	    mspi.write(c);
+	    cs = 1;
+	};
+
+	virtual void data(uint8_t c)
+	{
+	    cs = 1;
+	    dc = 1;
+	    cs = 0;
+	    mspi.write(c);
+	    cs = 1;
+	};
+
+protected:
+	virtual void sendDisplayBuffer()
+	{
+		cs = 1;
+		dc = 1;
+		cs = 0;
+
+		for(uint16_t i=0, q=buffer.size(); i<q; i++)
+			mspi.write(buffer[i]);
+
+		if(height() == 32)
+		{
+			for(uint16_t i=0, q=buffer.size(); i<q; i++)
+				mspi.write(0);
+		}
+
+		cs = 1;
+	};
+
+	DigitalOut2 cs, dc;
+	SPI &mspi;
+};
+
+/** This is the I2C SSD1306 display driver transport class
+ *
+ */
+class Adafruit_SSD1306_I2c : public Adafruit_SSD1306
+{
+public:
+	#define SSD_I2C_ADDRESS     0x78
+	/** Create a SSD1306 I2C transport display driver instance with the specified RST pin name, the I2C address, as well as the display dimensions
+	 *
+	 * Required parameters
+	 * @param i2c - A reference to an initialized I2C object
+	 * @param RST - The Reset pin name
+	 *
+	 * Optional parameters
+	 * @param i2cAddress - The i2c address of the display
+	 * @param rawHeight - The vertical number of pixels for the display, defaults to 32
+	 * @param rawWidth - The horizonal number of pixels for the display, defaults to 128
+	 */
+	Adafruit_SSD1306_I2c(I2C &i2c, PinName RST, uint8_t i2cAddress = SSD_I2C_ADDRESS, uint8_t rawHeight = 32, uint8_t rawWidth = 128)
+	    : Adafruit_SSD1306(RST, rawHeight, rawWidth)
+	    , mi2c(i2c)
+	    , mi2cAddress(i2cAddress)
+	    {
+		    begin();
+		    splash();
+		    display();
+	    };
+
+	virtual void command(uint8_t c)
+	{
+		char buff[2];
+		buff[0] = 0; // Command Mode
+		buff[1] = c;
+		mi2c.write(mi2cAddress, buff, sizeof(buff));
+	}
+
+	virtual void data(uint8_t c)
+	{
+		char buff[2];
+		buff[0] = 0x40; // Data Mode
+		buff[1] = c;
+		mi2c.write(mi2cAddress, buff, sizeof(buff));
+	};
+
+protected:
+	virtual void sendDisplayBuffer()
+	{
+		char buff[17];
+		buff[0] = 0x40; // Data Mode
+
+		// send display buffer in 16 byte chunks
+		for(uint16_t i=0, q=buffer.size(); i<q; i+=16 ) 
+		{	uint8_t x ;
+
+			// TODO - this will segfault if buffer.size() % 16 != 0
+			for(x=1; x<sizeof(buff); x++) 
+				buff[x] = buffer[i+x-1];
+			mi2c.write(mi2cAddress, buff, sizeof(buff));
+		}
+	};
+
+	I2C &mi2c;
+	uint8_t mi2cAddress;
+};
+
+#endif
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