Adafruit_SSD1306.h

00001 /*********************************************************************
00002 This is a library for our Monochrome OLEDs based on SSD1306 drivers
00003 
00004   Pick one up today in the adafruit shop!
00005   ------> http://www.adafruit.com/category/63_98
00006 
00007 These displays use SPI to communicate, 4 or 5 pins are required to  
00008 interface
00009 
00010 Adafruit invests time and resources providing this open source code, 
00011 please support Adafruit and open-source hardware by purchasing 
00012 products from Adafruit!
00013 
00014 Written by Limor Fried/Ladyada  for Adafruit Industries.  
00015 BSD license, check license.txt for more information
00016 All text above, and the splash screen must be included in any redistribution
00017 *********************************************************************/
00018 
00019 /*
00020  *  Modified by Neal Horman 7/14/2012 for use in mbed
00021  *  Modified by Greg Steiert 2/7/2017 for FeatherOLED
00022  */
00023 
00024 #ifndef _ADAFRUIT_SSD1306_H_
00025 #define _ADAFRUIT_SSD1306_H_
00026 
00027 #include "mbed.h"
00028 #include "Adafruit_GFX.h"
00029 
00030 #include <vector>
00031 #include <algorithm>
00032 
00033 #define SSD1306_EXTERNALVCC 0x1
00034 #define SSD1306_SWITCHCAPVCC 0x2
00035 
00036 /** The pure base class for the SSD1306 display driver.
00037  *
00038  * You should derive from this for a new transport interface type,
00039  * such as the SPI and I2C drivers.
00040  */
00041 class Adafruit_SSD1306 : public Adafruit_GFX
00042 {
00043 public:
00044     Adafruit_SSD1306(uint8_t rawHeight = 32, uint8_t rawWidth = 128)
00045         : Adafruit_GFX(rawWidth,rawHeight)
00046     {
00047         buffer.resize(rawHeight * rawWidth / 8);
00048     };
00049 
00050     void begin(uint8_t switchvcc = SSD1306_SWITCHCAPVCC);
00051     
00052     // These must be implemented in the derived transport driver
00053     virtual void command(uint8_t c) = 0;
00054     virtual void data(uint8_t c) = 0;
00055     virtual void drawPixel(int16_t x, int16_t y, uint16_t color);
00056 
00057     /// Clear the display buffer    
00058     void clearDisplay(void);
00059     virtual void invertDisplay(bool i);
00060 
00061     /// Cause the display to be updated with the buffer content.
00062     void display();
00063     /// Fill the buffer with the AdaFruit splash screen.
00064     virtual void splash();
00065     
00066 protected:
00067     virtual void sendDisplayBuffer() = 0;
00068 
00069     // the memory buffer for the LCD
00070     std::vector<uint8_t> buffer;
00071 };
00072 
00073 
00074 /** This is the I2C SSD1306 display driver transport class
00075  *
00076  */
00077 class Adafruit_SSD1306_I2c : public Adafruit_SSD1306
00078 {
00079 public:
00080     #define SSD_I2C_ADDRESS     0x78
00081     /** Create a SSD1306 I2C transport display driver instance with the specified RST pin name, the I2C address, as well as the display dimensions
00082      *
00083      * Required parameters
00084      * @param i2c - A reference to an initialized I2C object
00085      * @param RST - The Reset pin name
00086      *
00087      * Optional parameters
00088      * @param i2cAddress - The i2c address of the display
00089      * @param rawHeight - The vertical number of pixels for the display, defaults to 32
00090      * @param rawWidth - The horizonal number of pixels for the display, defaults to 128
00091      */
00092     Adafruit_SSD1306_I2c(I2C &i2c, uint8_t i2cAddress = SSD_I2C_ADDRESS, uint8_t rawHeight = 32, uint8_t rawWidth = 128)
00093         : Adafruit_SSD1306(rawHeight, rawWidth)
00094         , mi2c(i2c)
00095         , mi2cAddress(i2cAddress)
00096         {
00097             begin();
00098             splash();
00099             display();
00100         };
00101 
00102     virtual void command(uint8_t c)
00103     {
00104         char buff[2];
00105         buff[0] = 0; // Command Mode
00106         buff[1] = c;
00107         mi2c.write(mi2cAddress, buff, sizeof(buff));
00108     }
00109 
00110     virtual void data(uint8_t c)
00111     {
00112         char buff[2];
00113         buff[0] = 0x40; // Data Mode
00114         buff[1] = c;
00115         mi2c.write(mi2cAddress, buff, sizeof(buff));
00116     };
00117 
00118 protected:
00119     virtual void sendDisplayBuffer()
00120     {
00121         char buff[17];
00122         buff[0] = 0x40; // Data Mode
00123 
00124         // send display buffer in 16 byte chunks
00125         for(uint16_t i=0, q=buffer.size(); i<q; i+=16 ) 
00126         {   uint8_t x ;
00127 
00128             // TODO - this will segfault if buffer.size() % 16 != 0
00129             for(x=1; x<sizeof(buff); x++) 
00130                 buff[x] = buffer[i+x-1];
00131             mi2c.write(mi2cAddress, buff, sizeof(buff));
00132         }
00133     };
00134 
00135     I2C &mi2c;
00136     uint8_t mi2cAddress;
00137 };
00138 
00139 #endif