I2C Display with SDA2/SCL2

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urbanspaceman

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Hi, in my hardware i have a I2C display on SDA2 SCL2 (3/4)
if i run this sketch (with the wire2), the display is recognized (0X3C)

Code: 
...

#include <i2c_t3.h>
...
void setup()
{
    pinMode(LED_BUILTIN,OUTPUT);    // LED
    pinMode(12,INPUT_PULLUP);       // pull pin 12 low to show ACK only results
    pinMode(11,INPUT_PULLUP);       // pull pin 11 low for a more verbose result (shows both ACK and NACK)

    // Setup for Master mode, pins 18/19, external pullups, 400kHz, 10ms default timeout
    //Wire.begin(I2C_MASTER, 0x00, I2C_PINS_4_3, I2C_PULLUP_EXT, 400000);
    Wire2.begin(I2C_MASTER, 0x00, 3, 4);
    Wire2.setDefaultTimeout(10000); // 10ms


    Serial.begin(115200);
}

Now, if i try the example ssd1306_128x32_i2c (changing wire.h with i2c_t3.h), i get error

Code: 
/*********************************************************************
This is an example for our Monochrome OLEDs based on SSD1306 drivers

  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/category/63_98

This example is for a 128x32 size display using I2C to communicate
3 pins are required to interface (2 I2C and one reset)

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
*********************************************************************/

//#include <SPI.h>
//#include <Wire.h>
//#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <i2c_t3.h>

#define OLED_RESET 13
Adafruit_SSD1306 display(OLED_RESET);

#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2


#define LOGO16_GLCD_HEIGHT 16 
#define LOGO16_GLCD_WIDTH  16 
static const unsigned char PROGMEM logo16_glcd_bmp[] =
{ B00000000, B11000000,
  B00000001, B11000000,
  B00000001, B11000000,
  B00000011, B11100000,
  B11110011, B11100000,
  B11111110, B11111000,
  B01111110, B11111111,
  B00110011, B10011111,
  B00011111, B11111100,
  B00001101, B01110000,
  B00011011, B10100000,
  B00111111, B11100000,
  B00111111, B11110000,
  B01111100, B11110000,
  B01110000, B01110000,
  B00000000, B00110000 };

#if (SSD1306_LCDHEIGHT != 32)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

void setup()   {                
  Serial.begin(9600);
      Wire2.setSDA(4);
      Wire2.setSCL(3);
  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x32)
  // init done
  
  // Show image buffer on the display hardware.
  // Since the buffer is intialized with an Adafruit splashscreen
  // internally, this will display the splashscreen.
  display.display();
  delay(2000);

  // Clear the buffer.
  display.clearDisplay();

  // draw a single pixel
  display.drawPixel(10, 10, WHITE);
  // Show the display buffer on the hardware.
  // NOTE: You _must_ call display after making any drawing commands
  // to make them visible on the display hardware!
  display.display();
  delay(2000);
  display.clearDisplay();

  // draw many lines
  testdrawline();
  display.display();
  delay(2000);
  display.clearDisplay();

  // draw rectangles
  testdrawrect();
  display.display();
  delay(2000);
  display.clearDisplay();

  // draw multiple rectangles
  testfillrect();
  display.display();
  delay(2000);
  display.clearDisplay();

  // draw mulitple circles
  testdrawcircle();
  display.display();
  delay(2000);
  display.clearDisplay();

  // draw a white circle, 10 pixel radius
  display.fillCircle(display.width()/2, display.height()/2, 10, WHITE);
  display.display();
  delay(2000);
  display.clearDisplay();

  testdrawroundrect();
  delay(2000);
  display.clearDisplay();

  testfillroundrect();
  delay(2000);
  display.clearDisplay();

  testdrawtriangle();
  delay(2000);
  display.clearDisplay();
   
  testfilltriangle();
  delay(2000);
  display.clearDisplay();

  // draw the first ~12 characters in the font
  testdrawchar();
  display.display();
  delay(2000);
  display.clearDisplay();

  // draw scrolling text
  testscrolltext();
  delay(2000);
  display.clearDisplay();

  // text display tests
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("Hello, world!");
  display.setTextColor(BLACK, WHITE); // 'inverted' text
  display.println(3.141592);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.print("0x"); display.println(0xDEADBEEF, HEX);
  display.display();
  delay(2000);
  display.clearDisplay();

  // miniature bitmap display
  display.drawBitmap(30, 16,  logo16_glcd_bmp, 16, 16, 1);
  display.display();
  delay(1);

  // invert the display
  display.invertDisplay(true);
  delay(1000); 
  display.invertDisplay(false);
  delay(1000); 
  display.clearDisplay();

  // draw a bitmap icon and 'animate' movement
  testdrawbitmap(logo16_glcd_bmp, LOGO16_GLCD_HEIGHT, LOGO16_GLCD_WIDTH);
}


void loop() {
  
}


void testdrawbitmap(const uint8_t *bitmap, uint8_t w, uint8_t h) {
  uint8_t icons[NUMFLAKES][3];
 
  // initialize
  for (uint8_t f=0; f< NUMFLAKES; f++) {
    icons[f][XPOS] = random(display.width());
    icons[f][YPOS] = 0;
    icons[f][DELTAY] = random(5) + 1;
    
    Serial.print("x: ");
    Serial.print(icons[f][XPOS], DEC);
    Serial.print(" y: ");
    Serial.print(icons[f][YPOS], DEC);
    Serial.print(" dy: ");
    Serial.println(icons[f][DELTAY], DEC);
  }

  while (1) {
    // draw each icon
    for (uint8_t f=0; f< NUMFLAKES; f++) {
      display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, WHITE);
    }
    display.display();
    delay(200);
    
    // then erase it + move it
    for (uint8_t f=0; f< NUMFLAKES; f++) {
      display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, BLACK);
      // move it
      icons[f][YPOS] += icons[f][DELTAY];
      // if its gone, reinit
      if (icons[f][YPOS] > display.height()) {
        icons[f][XPOS] = random(display.width());
        icons[f][YPOS] = 0;
        icons[f][DELTAY] = random(5) + 1;
      }
    }
   }
}


void testdrawchar(void) {
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);

  for (uint8_t i=0; i < 168; i++) {
    if (i == '\n') continue;
    display.write(i);
    if ((i > 0) && (i % 21 == 0))
      display.println();
  }    
  display.display();
  delay(1);
}

void testdrawcircle(void) {
  for (int16_t i=0; i<display.height(); i+=2) {
    display.drawCircle(display.width()/2, display.height()/2, i, WHITE);
    display.display();
    delay(1);
  }
}

void testfillrect(void) {
  uint8_t color = 1;
  for (int16_t i=0; i<display.height()/2; i+=3) {
    // alternate colors
    display.fillRect(i, i, display.width()-i*2, display.height()-i*2, color%2);
    display.display();
    delay(1);
    color++;
  }
}

void testdrawtriangle(void) {
  for (int16_t i=0; i<min(display.width(),display.height())/2; i+=5) {
    display.drawTriangle(display.width()/2, display.height()/2-i,
                     display.width()/2-i, display.height()/2+i,
                     display.width()/2+i, display.height()/2+i, WHITE);
    display.display();
    delay(1);
  }
}

void testfilltriangle(void) {
  uint8_t color = WHITE;
  for (int16_t i=min(display.width(),display.height())/2; i>0; i-=5) {
    display.fillTriangle(display.width()/2, display.height()/2-i,
                     display.width()/2-i, display.height()/2+i,
                     display.width()/2+i, display.height()/2+i, WHITE);
    if (color == WHITE) color = BLACK;
    else color = WHITE;
    display.display();
    delay(1);
  }
}

void testdrawroundrect(void) {
  for (int16_t i=0; i<display.height()/2-2; i+=2) {
    display.drawRoundRect(i, i, display.width()-2*i, display.height()-2*i, display.height()/4, WHITE);
    display.display();
    delay(1);
  }
}

void testfillroundrect(void) {
  uint8_t color = WHITE;
  for (int16_t i=0; i<display.height()/2-2; i+=2) {
    display.fillRoundRect(i, i, display.width()-2*i, display.height()-2*i, display.height()/4, color);
    if (color == WHITE) color = BLACK;
    else color = WHITE;
    display.display();
    delay(1);
  }
}
   
void testdrawrect(void) {
  for (int16_t i=0; i<display.height()/2; i+=2) {
    display.drawRect(i, i, display.width()-2*i, display.height()-2*i, WHITE);
    display.display();
    delay(1);
  }
}

void testdrawline() {  
  for (int16_t i=0; i<display.width(); i+=4) {
    display.drawLine(0, 0, i, display.height()-1, WHITE);
    display.display();
    delay(1);
  }
  for (int16_t i=0; i<display.height(); i+=4) {
    display.drawLine(0, 0, display.width()-1, i, WHITE);
    display.display();
    delay(1);
  }
  delay(250);
  
  display.clearDisplay();
  for (int16_t i=0; i<display.width(); i+=4) {
    display.drawLine(0, display.height()-1, i, 0, WHITE);
    display.display();
    delay(1);
  }
  for (int16_t i=display.height()-1; i>=0; i-=4) {
    display.drawLine(0, display.height()-1, display.width()-1, i, WHITE);
    display.display();
    delay(1);
  }
  delay(250);
  
  display.clearDisplay();
  for (int16_t i=display.width()-1; i>=0; i-=4) {
    display.drawLine(display.width()-1, display.height()-1, i, 0, WHITE);
    display.display();
    delay(1);
  }
  for (int16_t i=display.height()-1; i>=0; i-=4) {
    display.drawLine(display.width()-1, display.height()-1, 0, i, WHITE);
    display.display();
    delay(1);
  }
  delay(250);

  display.clearDisplay();
  for (int16_t i=0; i<display.height(); i+=4) {
    display.drawLine(display.width()-1, 0, 0, i, WHITE);
    display.display();
    delay(1);
  }
  for (int16_t i=0; i<display.width(); i+=4) {
    display.drawLine(display.width()-1, 0, i, display.height()-1, WHITE); 
    display.display();
    delay(1);
  }
  delay(250);
}

void testscrolltext(void) {
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(10,0);
  display.clearDisplay();
  display.println("scroll");
  display.display();
  delay(1);
 
  display.startscrollright(0x00, 0x0F);
  delay(2000);
  display.stopscroll();
  delay(1000);
  display.startscrollleft(0x00, 0x0F);
  delay(2000);
  display.stopscroll();
  delay(1000);    
  display.startscrolldiagright(0x00, 0x07);
  delay(2000);
  display.startscrolldiagleft(0x00, 0x07);
  delay(2000);
  display.stopscroll();
}

Code: 
Arduino:1.8.5 (Mac OS X), TD: 1.42, Scheda:"Teensy 3.6, Serial, 180 MHz, Faster, US English"

/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o: In function `i2c0_isr':
/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/Wire/WireKinetis.cpp:886: multiple definition of `i2c0_isr'
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o:/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/i2c_t3/i2c_t3.cpp:1121: first defined here
/Applications/Arduino.app/Contents/Java/hardware/tools/arm/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld: Disabling relaxation: it will not work with multiple definitions
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o: In function `Print::availableForWrite()':
/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/Wire/WireKinetis.h:132: multiple definition of `i2c1_isr'
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o:/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/i2c_t3/i2c_t3.h:857: first defined here
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o: In function `Print::availableForWrite()':
/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/Wire/WireKinetis.h:132: multiple definition of `i2c2_isr'
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o:/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/i2c_t3/i2c_t3.h:857: first defined here
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o: In function `Print::availableForWrite()':
/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/Wire/WireKinetis.h:132: multiple definition of `Wire2'
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o:/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/i2c_t3/i2c_t3.h:857: first defined here
/Applications/Arduino.app/Contents/Java/hardware/tools/arm/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld: Warning: size of symbol `Wire2' changed from 20 in /var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o to 108 in /var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o: In function `Print::availableForWrite()':
/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/Wire/WireKinetis.h:132: multiple definition of `Wire1'
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o:/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/i2c_t3/i2c_t3.h:857: first defined here
/Applications/Arduino.app/Contents/Java/hardware/tools/arm/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld: Warning: size of symbol `Wire1' changed from 20 in /var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o to 108 in /var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o: In function `Print::availableForWrite()':
/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/Wire/WireKinetis.h:132: multiple definition of `Wire'
Più di una libreria trovata per "Adafruit_GFX.h"
Usata: /Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/Adafruit_GFX
Non usata: /Users/Urbanspaceman/Documents/Arduino/libraries/Adafruit_GFX_Library
/var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o:/Applications/Arduino.app/Contents/Java/hardware/teensy/avr/libraries/i2c_t3/i2c_t3.h:857: first defined here
/Applications/Arduino.app/Contents/Java/hardware/tools/arm/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld: Warning: size of symbol `Wire' changed from 20 in /var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/i2c_t3/i2c_t3.cpp.o to 108 in /var/folders/_2/6t2b67t970qbzld8fhtybsqh0000gp/T/arduino_build_417306/libraries/Wire/WireKinetis.cpp.o
collect2: error: ld returned 1 exit status
Errore durante la compilazione per la scheda Teensy 3.6.

how can i solve?
Thanks
 
Adafruit_SSD1306.cpp uses Wire.h. Your sketch can't use both Wire.h and i2c_t3.h. If you want to use i2c_t3.h, you'll have to hack Adafruit_SSD1306 lib to use i2c_t3.h
 
No. Your program can use either Wire.h or i2c_t3.h, but not both. Only 1 of these can be used across *all* of your program.
 
Thanks paul,
my question was different,
if I use wire.h (and not i2c_t3), can I use SCA2 and SCL2? (with wire.setSCA(3) and wire.setSCL(4) )

if I can not, I have to use 12c_t3 but do I have to change the display library?
 
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