Display errors for 2 OLED I2Cs

Projects Networking, Protocols, and Devices
1

Trying to get 2 oleds going on my Nano, and I'm running into primary expression errors.

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <SD.h>
#include <Bounce2.h>

// Constants
Adafruit_SSD1306 display1(-1,128, 64);
Adafruit_SSD1306 display2(-1,128, 64);


#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define SCREEN_ADDRESS1 0x3D ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
#define SCREEN_ADDRESS2 0x3c ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
#define LEFT_ENCODER_CLK 2
#define LEFT_ENCODER_DT 3
#define LEFT_ENCODER_BTN 4
#define RIGHT_ENCODER_CLK 5
#define RIGHT_ENCODER_DT 6
#define RIGHT_ENCODER_BTN 7
#define RESET_BUTTON 16
#define BUTTON_3D6 17
#define BUTTON_STATS 15
#define SD_CS 4
#define display1
#define display2


// Objects
Bounce resetButton = Bounce();
Bounce button3d6 = Bounce();
Bounce statsButton = Bounce();

// Variables
const char *diceTypes[] = { "D20", "D12", "D10", "D8", "D6", "D4", "D0" };
const char *statsList[] = { "Ht", "IQ", "Str", "Ht", "Will", "Dex", "Obs" };
int diceSelection = 0;
int numDice = 0;
int modifier = 0;
bool d6Only = false;
long lastActivity = 0;

void displayMainMenu() {
  display1.clearDisplay();
  display1.setCursor(0, 0);
  display1.print("D6 Only? Yes/No");
  display1.display();
}

void roll3d6() {
  int rolls[3];
  int total = 0;
  for (int i = 0; i < 3; i++) {
    rolls[i] = random(1, 7);
    total += rolls[i];
  }
  display2.clearDisplay2();
  display2.setCursor(0, 0);
  display2.print("3D6 Roll Total: ");
  display2.println(total);
  display2.display2();
}

void displayStats() {
  display1.clearDisplay1();
  display1.setCursor(0, 0);
  display1.print("Stats Menu");
  display1.display1();
}

void handleEncoders() {
  // Implement rotary encoder handling for dice selection and menu navigation
}

void handleButtons() {
  if (button3d6.fell()) {
    roll3d6();
  }
  if (statsButton.fell()) {
    displayStats();
  }
}

void setup() {
  pinMode(LEFT_ENCODER_CLK, INPUT);
  pinMode(LEFT_ENCODER_DT, INPUT);
  pinMode(LEFT_ENCODER_BTN, INPUT_PULLUP);
  pinMode(RIGHT_ENCODER_CLK, INPUT);
  pinMode(RIGHT_ENCODER_DT, INPUT);
  pinMode(RIGHT_ENCODER_BTN, INPUT_PULLUP);
  pinMode(RESET_BUTTON, INPUT_PULLUP);
  pinMode(BUTTON_3D6, INPUT_PULLUP);
  pinMode(BUTTON_STATS, INPUT_PULLUP);

  resetButton.attach(RESET_BUTTON);
  resetButton.interval(5);
  button3d6.attach(BUTTON_3D6);
  button3d6.interval(5);
  statsButton.attach(BUTTON_STATS);
  statsButton.interval(5);

  if (!display1.begin(0x3C, OLED_RESET) || !display2.begin(0x3D, OLED_RESET)) {
    while (true)
      ;  // Stop if displays aren't found
  }

  display1.clearDisplay1();
  display1.display1();
  display2.clearDisplay2();
  display2.display2();

  if (!SD.begin(SD_CS)) {
    d6Only = true;  // Disable certain functionality if SD card is absent
  }

  displayMainMenu();
}

void loop() {
  resetButton.update();
  button3d6.update();
  statsButton.update();

  // Handle inactivity timeout
  if (millis() - lastActivity > 30000) {
    displayMainMenu();
  }

  // Reset button
  if (resetButton.fell()) {
    displayMainMenu();
  }

  // Handle other buttons and encoders
  handleEncoders();
  handleButtons();
}
2

Both display1 and display2 will attempt to allocate 1K of RAM at runtime. Since a Nano uses an ATmega328P, which has only 2K of RAM in total, the second allocation attempt will always fail. You need to either use a board with a processor that has more than 2K of RAM, or use a different library that doesn't allocate a 1K buffer for each screen.

3

These two lines cause the major problem. Not sure what you are trying to do, but this effectively deletes the text "display1" and "display2" wherever it appears in the sketch.

#define display1
#define display2

The function names clearDisplay(), display(), etc, remain the same regardless of the name you give to the particular display instance.

  display1.clearDisplay1();
  display1.display1();
  display2.clearDisplay2();
  display2.display2();
1 Like
4

Thanks ,I'll modify this.

5

copy, thanks. I'll look at different libraries!

6

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