oled.h

void initDisplay();

// OLED FeatherWing buttons map to different pins depending on board.
// The I2C (Wire) bus may also be different.
#if defined(ESP8266)
  #define BUTTON_A  0
  #define BUTTON_B 16
  #define BUTTON_C  2
  #define WIRE Wire
#elif defined(ESP32)
  #define BUTTON_A 15
  #define BUTTON_B 32
  #define BUTTON_C 14
  #define WIRE Wire
#elif defined(ARDUINO_STM32_FEATHER)
  #define BUTTON_A PA15
  #define BUTTON_B PC7
  #define BUTTON_C PC5
  #define WIRE Wire
#elif defined(TEENSYDUINO)
  #define BUTTON_A  4
  #define BUTTON_B  3
  #define BUTTON_C  8
  #define WIRE Wire
#elif defined(ARDUINO_FEATHER52832)
  #define BUTTON_A 31
  #define BUTTON_B 30
  #define BUTTON_C 27
  #define WIRE Wire
#elif defined(ARDUINO_ADAFRUIT_FEATHER_RP2040)
  #define BUTTON_A  9
  #define BUTTON_B  8
  #define BUTTON_C  7
  #define WIRE Wire1
#else // 32u4, M0, M4, nrf52840 and 328p
  #define BUTTON_A  9
  #define BUTTON_B  6
  #define BUTTON_C  5
  #define WIRE Wire
#endif

extern Adafruit_SSD1306 display;