Diff: Adafruit_SSD1306.h

Revision:

0:cb63da12fdcc

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+++ b/Adafruit_SSD1306.h	Tue Nov 26 04:49:45 2019 +0000
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+/*********************************************************************
+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>
+ 
+#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, bool _flipVertical=false)
+        : Adafruit_GFX(rawWidth,rawHeight)
+        , rst(RST,false)
+        , flipVertical(_flipVertical)
+    {
+        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;
+    DigitalOut rst;
+    bool flipVertical;
+ 
+    // 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, bool flipVertical = false)
+        : Adafruit_SSD1306(RST, rawHieght, rawWidth, flipVertical)
+        , 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;
+    };
+ 
+    DigitalOut 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, bool flipVertical = false)
+        : Adafruit_SSD1306(RST, rawHeight, rawWidth, flipVertical)
+        , 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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