Neal Horman / Adafruit_GFX

A derived version of the BSD licensed Adafrut GFX library for the SSD1306 controller for an OLED 128x32 or 128x64 display using SPI or I2C.

Dependents:   servo_sensor ArchPro_TFT BLE_Display SSD1306_demo ... more

Import libraryAdafruit_GFX

A derived version of the BSD licensed Adafrut GFX library for the SSD1306 controller for an OLED 128x32 or 128x64 display using SPI or I2C.

Last commit 11 Nov 2014 by Neal Horman

This is an SPI or I2C driver, font, and graphics drawing library as initially provided by Adafruit which has been modified for use in the mbed envionment.

128x32 OLED Display

Example

/*
 *  Copyright (c) 2012 Neal Horman - http://www.wanlink.com
 *  
 *  License: MIT open source (http://opensource.org/licenses/MIT)
 *      Summary;
 *      Use / modify / distribute / publish it how you want and 
 *      if you use it, or don't, you can't hold me liable for how
 *      it does or doesn't work.
 *      If it doesn't work how you want, don't use it, or change
 *      it so that it does work.
 */
 
#include "mbed.h"
#include "Adafruit_SSD1306.h"

DigitalOut myled(LED1);

// an SPI sub-class that provides a constructed default
class SPIPreInit : public SPI
{
public:
    SPIPreInit(PinName mosi, PinName miso, PinName clk) : SPI(mosi,miso,clk)
    {
        format(8,3);
        frequency(2000000);
    };
};

// an I2C sub-class that provides a constructed default
class I2CPreInit : public I2C
{
public:
    I2CPreInit(PinName sda, PinName scl) : I2C(sda, scl)
    {
        frequency(400000);
        start();
    };
};

SPIPreInit gSpi(p5,NC,p7);
Adafruit_SSD1306_Spi gOled1(gSpi,p26,p25,p24);

I2CPreInit gI2C(p9,p10);
Adafruit_SSD1306_I2c gOled2(gI2C,p27);

int main()
{   uint16_t x=0;

    gOled1.printf("%ux%u OLED Display\r\n", gOled1.width(), gOled1.height());
    gOled2.printf("%ux%u OLED Display\r\n", gOled2.width(), gOled2.height());
    
    while(1)
    {
        myled = !myled;
        gOled1.printf("%u\r",x);
        gOled1.display();
        gOled2.printf("%u\r",x);
        gOled2.display();
        x++;
        wait(1.0);
    }
}

Diff: Adafruit_SSD1306.h

Revision:
6:1be3e3b46eb7
Parent:
3:969ca9fe5e2b
Child:
7:779204e24db4
--- a/Adafruit_SSD1306.h	Thu Oct 16 23:18:25 2014 -0500
+++ b/Adafruit_SSD1306.h	Sat Oct 18 11:47:17 2014 -0500
@@ -43,6 +43,9 @@
     -----------------------------------------------------------------------*/
 //#define SSD1306_128_64
 #define SSD1306_128_32
+
+#define SSD_USES_SPI
+//#define SSD_USES_I2C
 /*=========================================================================*/
 
 #if defined SSD1306_128_64 && defined SSD1306_128_32
@@ -61,6 +64,19 @@
     #define SSD1306_LCDHEIGHT 32
 #endif
 
+#if defined SSD_USES_SPI && defined SSD_USES_I2C
+    #error "Only one communication mode can be specified at once in SSD1306.h"
+#endif
+#if !defined SSD_USES_SPI && !defined SSD_USES_I2C
+    #error "At least one communication mode must be specified in SSD1306.h"
+#endif
+
+//#define WITHOUT_SPLASH
+#define I2C_ADDRESS     0x78
+
+#define SSD_Command_Mode    0x00
+#define SSD_Data_Mode       0x40
+
 #define SSD1306_SETCONTRAST 0x81
 #define SSD1306_DISPLAYALLON_RESUME 0xA4
 #define SSD1306_DISPLAYALLON 0xA5
@@ -98,7 +114,11 @@
 class Adafruit_SSD1306 : public Adafruit_GFX
 {
  public:
+#ifdef SSD_USES_SPI
     Adafruit_SSD1306(SPI &spi, PinName DC, PinName RST, PinName CS);
+#elif defined SSD_USES_I2C
+    Adafruit_SSD1306(I2C &i2c, PinName RST);
+#endif
     void begin(uint8_t switchvcc = SSD1306_SWITCHCAPVCC);
     void ssd1306_command(uint8_t c);
     void ssd1306_data(uint8_t c);
@@ -110,8 +130,15 @@
     virtual void drawPixel(int16_t x, int16_t y, uint16_t color);
     
 private:
-    DigitalOut2 rst,cs,dc;
+    
+    Serial pc;
+    DigitalOut2 rst;
+#ifdef SSD_USES_SPI
     SPI &mspi;
+    DigitalOut2 cs,dc;
+#elif defined SSD_USES_I2C
+    I2C &mi2c;
+#endif
     // the memory buffer for the LCD
     uint8_t buffer[SSD1306_LCDHEIGHT * SSD1306_LCDWIDTH / 8];
 };