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Thread: Using Teensy 3.2 on I2c Wire1 (pins 2930) with SSD1306 Library

  1. #1
    Junior Member
    Join Date
    Sep 2018

    Using Teensy 3.2 on I2c Wire1 (pins 2930) with SSD1306 Library

    I am trying to use an SSD1306 Display with Teensy 3.2 on pins 29-30 WIre 1. I have other devices currently running successfully on pins 29-30. I am able to detect the device by running a test to determine which devices replay back on I2C.

    I have tried the I2c_t3.h Library and the wire.h, but the display does not run on the wire1 (29-30 pins.)

    I also tried the modified SSD1306 by Kurt E, that allows you to pass the instances of which IC2 interface to the SSD1306 library to no avail.

    Does anyone have an example skecth with SSD1306 successfully running on I2c SCA1 SCK1.

    In addition is there any information on how to pass the Wire1 information to the SSD1306 library.

    Here is the modification I made to the sample to try to make this work.

    Modified SSD1306 for Wire 1:

    ************************************************** *******************
    This is a library for our Monochrome OLEDs based on SSD1306 drivers

    Pick one up today in the adafruit shop!

    These displays use SPI to communicate, 4 or 5 pins are required to

    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
    ************************************************** *******************/
    #ifndef _Adafruit_SSD1306_H_
    #define _Adafruit_SSD1306_H_

    #if ARDUINO >= 100
    #include "Arduino.h"
    #define WIRE_WRITE _WireD.write
    #include "WProgram.h"
    #define WIRE_WRITE _WireD.send

    #if defined(__SAM3X8E__)
    typedef volatile RwReg PortReg;
    typedef uint32_t PortMask;
    #define HAVE_PORTREG
    #elif defined(ARDUINO_ARCH_SAMD)
    // not supported
    #elif defined(ESP8266) || defined(ARDUINO_STM32_FEATHER)
    typedef volatile uint32_t PortReg;
    typedef uint32_t PortMask;
    typedef volatile uint8_t PortReg;
    typedef uint8_t PortMask;
    #define HAVE_PORTREG

    #include <SPI.h>
    #include <Adafruit_GFX.h>

    #define BLACK 0
    #define WHITE 1
    #define INVERSE 2

    #define SSD1306_I2C_ADDRESS 0x3C // 011110+SA0+RW - 0x3C or 0x3D
    // Address for 128x32 is 0x3C
    // Address for 128x64 is 0x3D (default) or 0x3C (if SA0 is grounded)

    /*================================================= ========================
    SSD1306 Displays
    The driver is used in multiple displays (128x64, 128x32, etc.).
    Select the appropriate display below to create an appropriately
    sized framebuffer, etc.

    SSD1306_128_64 128x64 pixel display

    SSD1306_128_32 128x32 pixel display


    #define SSD1306_128_64
    // #define SSD1306_128_32
    // #define SSD1306_96_16
    /*================================================= ========================*/

    #if defined SSD1306_128_64 && defined SSD1306_128_32
    #error "Only one SSD1306 display can be specified at once in SSD1306.h"
    #if !defined SSD1306_128_64 && !defined SSD1306_128_32 && !defined SSD1306_96_16
    #error "At least one SSD1306 display must be specified in SSD1306.h"

    #if defined SSD1306_128_64
    #define SSD1306_LCDWIDTH 128
    #define SSD1306_LCDHEIGHT 64
    #if defined SSD1306_128_32
    #define SSD1306_LCDWIDTH 128
    #define SSD1306_LCDHEIGHT 32
    #if defined SSD1306_96_16
    #define SSD1306_LCDWIDTH 96
    #define SSD1306_LCDHEIGHT 16

    #define SSD1306_SETCONTRAST 0x81
    #define SSD1306_DISPLAYALLON_RESUME 0xA4
    #define SSD1306_DISPLAYALLON 0xA5
    #define SSD1306_NORMALDISPLAY 0xA6
    #define SSD1306_INVERTDISPLAY 0xA7
    #define SSD1306_DISPLAYOFF 0xAE
    #define SSD1306_DISPLAYON 0xAF

    #define SSD1306_SETDISPLAYOFFSET 0xD3
    #define SSD1306_SETCOMPINS 0xDA

    #define SSD1306_SETVCOMDETECT 0xDB

    #define SSD1306_SETPRECHARGE 0xD9

    #define SSD1306_SETMULTIPLEX 0xA8

    #define SSD1306_SETLOWCOLUMN 0x00
    #define SSD1306_SETHIGHCOLUMN 0x10

    #define SSD1306_SETSTARTLINE 0x40

    #define SSD1306_MEMORYMODE 0x20
    #define SSD1306_COLUMNADDR 0x21
    #define SSD1306_PAGEADDR 0x22

    #define SSD1306_COMSCANINC 0xC0
    #define SSD1306_COMSCANDEC 0xC8

    #define SSD1306_SEGREMAP 0xA0

    #define SSD1306_CHARGEPUMP 0x8D

    #define SSD1306_EXTERNALVCC 0x1
    #define SSD1306_SWITCHCAPVCC 0x2

    // Scrolling #defines
    #define SSD1306_ACTIVATE_SCROLL 0x2F
    #define SSD1306_DEACTIVATE_SCROLL 0x2E
    #define SSD1306_RIGHT_HORIZONTAL_SCROLL 0x26
    #define SSD1306_LEFT_HORIZONTAL_SCROLL 0x27

    class Adafruit_SSD1306 : public Adafruit_GFX {
    Adafruit_SSD1306(int8_t SID, int8_t SCLK, int8_t DC, int8_t RST, int8_t CS);
    Adafruit_SSD1306(int8_t DC, int8_t RST, int8_t CS);

    Adafruit_SSD1306(int8_t RST = -1, TwoWire &WireD = Wire1);

    void begin(uint8_t switchvcc = SSD1306_SWITCHCAPVCC, uint8_t i2caddr = SSD1306_I2C_ADDRESS, bool reset=true);
    void ssd1306_command(uint8_t c);

    void clearDisplay(void);
    void invertDisplay(uint8_t i);
    void display();

    void startscrollright(uint8_t start, uint8_t stop);
    void startscrollleft(uint8_t start, uint8_t stop);

    void startscrolldiagright(uint8_t start, uint8_t stop);
    void startscrolldiagleft(uint8_t start, uint8_t stop);
    void stopscroll(void);

    void dim(boolean dim);

    void drawPixel(int16_t x, int16_t y, uint16_t color);

    virtual void drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color);
    virtual void drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color);

    int8_t _i2caddr, _vccstate, sid, sclk, dc, rst, cs;
    void fastSPIwrite(uint8_t c);

    boolean hwSPI;
    TwoWire &_WireD; // Reference to which Wire Buss object we are using...
    #ifdef HAVE_PORTREG
    PortReg *mosiport, *clkport, *csport, *dcport;
    PortMask mosipinmask, clkpinmask, cspinmask, dcpinmask;

    inline void drawFastVLineInternal(int16_t x, int16_t y, int16_t h, uint16_t color) __attribute__((always_inline));
    inline void drawFastHLineInternal(int16_t x, int16_t y, int16_t w, uint16_t color) __attribute__((always_inline));


    #endif /* _Adafruit_SSD1306_H_ */

  2. #2
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    If using Adafruit's library, you'll need to edit all their code to replace all "SPI" with "SPI1".

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