Using 2 x i2c display's with same address using SDA1/SCL1

M

MorryStu

Member
Hi Guys

I am trying to get 2 x OLED displays to work on separate 12c bus's using the standard SDA0/SCL0 (18,19) and SDA1/SDA2 (16,17) pins

When I compile I get an error

Compilation error: no matching function for call to 'TwoWire::begin(int, int)'

Code: 
/home/stu/Arduino/Dusl_12c_oled/Dusl_12c_oled.ino: In function 'void setup()':
/home/stu/Arduino/Dusl_12c_oled/Dusl_12c_oled.ino:33:14: error: no matching function for call to 'TwoWire::begin(int, int)'
   33 |    Wire.begin(I2C_A_SDA, I2C_A_SCL); // display  1
      |    ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
In file included from /home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/Wire.h:26,
                 from /home/stu/Arduino/Dusl_12c_oled/Dusl_12c_oled.ino:1:
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:71:14: note: candidate: 'void TwoWire::begin()'
   71 |         void begin();
      |              ^~~~~
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:71:14: note:   candidate expects 0 arguments, 2 provided
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:72:14: note: candidate: 'void TwoWire::begin(uint8_t)'
   72 |         void begin(uint8_t address);
      |              ^~~~~
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:72:14: note:   candidate expects 1 argument, 2 provided
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:73:14: note: candidate: 'void TwoWire::begin(int)'
   73 |         void begin(int address) {
      |              ^~~~~
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:73:14: note:   candidate expects 1 argument, 2 provided
/home/stu/Arduino/Dusl_12c_oled/Dusl_12c_oled.ino:34:15: error: no matching function for call to 'TwoWire::begin(int, int)'
   34 |    Wire1.begin(I2C_B_SDA, I2C_B_SCL); // display 2
      |    ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
In file included from /home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/Wire.h:26,
                 from /home/stu/Arduino/Dusl_12c_oled/Dusl_12c_oled.ino:1:
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:71:14: note: candidate: 'void TwoWire::begin()'
   71 |         void begin();
      |              ^~~~~
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:71:14: note:   candidate expects 0 arguments, 2 provided
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:72:14: note: candidate: 'void TwoWire::begin(uint8_t)'
   72 |         void begin(uint8_t address);
      |              ^~~~~
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:72:14: note:   candidate expects 1 argument, 2 provided
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:73:14: note: candidate: 'void TwoWire::begin(int)'
   73 |         void begin(int address) {
      |              ^~~~~
/home/stu/.arduino15/packages/teensy/hardware/avr/1.59.0/libraries/Wire/WireIMXRT.h:73:14: note:   candidate expects 1 argument, 2 provided

exit status 1

Compilation error: no matching function for call to 'TwoWire::begin(int, int)'

Code: 
#include <Wire.h>
#include <WireIMXRT.h>
#include <WireKinetis.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

extern TwoWire Wire1;

// #define Wire Wire
#define WIRE Wire
#define I2C_A_SDA 18 //  I2c pins for display 1 on 12c bus A
#define I2C_A_SCL 19 //

#define I2C_B_SDA 16 // i2c pins for display 2 on i2c bus B
#define I2C_B_SCL 17 //

// OLED parameters
#define SCREEN_WIDTH 128     // OLED display width, in pixels
#define SCREEN_HEIGHT 64     // OLED display height, in pixels
#define OLED_RESET -1        // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C  // Change if required
#define ROTATION 0           // Rotates text on OLED 1=90 degrees, 2=180 degrees

// Define display object
Adafruit_SSD1306 display1(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
Adafruit_SSD1306 display2(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire1, OLED_RESET);

void setup() {
  Serial.begin(115200);
  while (!Serial)
    ;
   Wire.begin(I2C_A_SDA, I2C_A_SCL); // display  1
   Wire1.begin(I2C_B_SDA, I2C_B_SCL); // display 2

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display1.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("Display1 SSD1306 allocation failed"));
    for (;;)
      ;  // Don't proceed, loop forever
  }
 
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display2.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("Display2 SSD1306 allocation failed"));
    for (;;)
      ;  // Don't proceed, loop forever
  }

// Show splash screen
  display1.display();
  display2.display();
  delay(2000); // Pause for 2 seconds

  // Display settings
  display1.clearDisplay();
  display1.setTextSize(2);             // Normal 1:1 pixel scale
  display1.setTextColor(WHITE);        // Draw white text
  display1.setCursor(0,0);             // Start at top-left corner
  display1.setRotation(ROTATION);      // Set screen rotation

  // Display settings
  display2.clearDisplay();
  display2.setTextSize(2);             // Normal 1:1 pixel scale
  display2.setTextColor(WHITE);        // Draw white text
  display2.setCursor(0,0);             // Start at top-left corner
  display2.setRotation(ROTATION);      // Set screen rotation

  display1.print("Display1 ");
  display2.print("Display2 ");

  display1.display();
  display2.display();

}


void loop() {
}
 
You probably meant to call
Code: 
Wire.setSDA(I2C_A_SDA);
Wire.setSCL(I2C_A_SCL);
Wire1.setSDA(I2C_B_SDA);
Wire1.setSCL(I2C_B_SCL);
If you're using master mode then simply call Wire.begin().
Wire.begin(address) is used if you're using Wire in slave mode, where you will respond at "address" when other I2C masters chips initiate communication.
 
Thanks, that worked with Wire.begin()

C: 
#include <Wire.h>
#include <WireIMXRT.h>
#include <WireKinetis.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
//extern TwoWire Wire1;

#define Wire Wire
//#define WIRE Wire
#define I2C_A_SDA 18  //  I2c pins for display 1 on 12c bus A
#define I2C_A_SCL 19  //

#define I2C_B_SDA 16  // i2c pins for display 2 on i2c bus B
#define I2C_B_SCL 17  //

// OLED parameters
#define SCREEN_WIDTH 128  // OLED display width, in pixels
#define SCREEN_HEIGHT 64  // OLED display height, in pixels
#define OLED_RESET -1     // Reset pin # (or -1 if sharing Arduino reset pin)
//#define SCREEN_ADDRESS 0x3C  // Change if required
#define ROTATION 0  // Rotates text on OLED 1=90 degrees, 2=180 degrees

// Define display object
Adafruit_SSD1306 display1(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
Adafruit_SSD1306 display2(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire1, OLED_RESET);


void setup() {
  Serial.begin(115200);
  while (!Serial)
    ;

  Wire.begin();
  Wire1.begin();
  Wire.setSDA(I2C_A_SDA);
  Wire.setSCL(I2C_A_SCL);
  Wire1.setSDA(I2C_B_SDA);
  Wire1.setSCL(I2C_B_SCL);
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display1.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("Display1 SSD1306 allocation failed"));
    for (;;)
      ;  // Don't proceed, loop forever
  }

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display2.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("Display2 SSD1306 allocation failed"));
    for (;;)
      ;  // Don't proceed, loop forever
  }

  // Show splash screen
  display1.display();
  display2.display();
  delay(2000);  // Pause for 2 seconds

  // Display settings
  display1.clearDisplay();
  display1.setTextSize(2);         // Normal 1:1 pixel scale
  display1.setTextColor(WHITE);    // Draw white text
  display1.setCursor(0, 0);        // Start at top-left corner
  display1.setRotation(ROTATION);  // Set screen rotation

  // Display settings
  display2.clearDisplay();
  display2.setTextSize(2);         // Normal 1:1 pixel scale
  display2.setTextColor(WHITE);    // Draw white text
  display2.setCursor(0, 0);        // Start at top-left corner
  display2.setRotation(ROTATION);  // Set screen rotation

  display1.print("Display1 ");
  display2.print("Display2 ");

  display1.display();
  display2.display();
}


void loop() {
}
 
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