First init.

libraries/Adafruit_SH110X/examples/OLED_featherwing/OLED_featherwing.ino

@@ -0,0 +1,79 @@
+#include <SPI.h>
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SH110X.h>
+
+Adafruit_SH1107 display = Adafruit_SH1107(64, 128, &Wire);
+
+// OLED FeatherWing buttons map to different pins depending on board:
+#if defined(ESP8266)
+  #define BUTTON_A  0
+  #define BUTTON_B 16
+  #define BUTTON_C  2
+#elif defined(ESP32) && !defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2)
+  #define BUTTON_A 15
+  #define BUTTON_B 32
+  #define BUTTON_C 14
+#elif defined(ARDUINO_STM32_FEATHER)
+  #define BUTTON_A PA15
+  #define BUTTON_B PC7
+  #define BUTTON_C PC5
+#elif defined(TEENSYDUINO)
+  #define BUTTON_A  4
+  #define BUTTON_B  3
+  #define BUTTON_C  8
+#elif defined(ARDUINO_NRF52832_FEATHER)
+  #define BUTTON_A 31
+  #define BUTTON_B 30
+  #define BUTTON_C 27
+#else // 32u4, M0, M4, nrf52840, esp32-s2 and 328p
+  #define BUTTON_A  9
+  #define BUTTON_B  6
+  #define BUTTON_C  5
+#endif
+
+void setup() {
+  Serial.begin(115200);
+
+  Serial.println("128x64 OLED FeatherWing test");
+  delay(250); // wait for the OLED to power up
+  display.begin(0x3C, true); // Address 0x3C default
+
+  Serial.println("OLED begun");
+
+  // 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(1000);
+
+  // Clear the buffer.
+  display.clearDisplay();
+  display.display();
+
+  display.setRotation(1);
+  Serial.println("Button test");
+
+  pinMode(BUTTON_A, INPUT_PULLUP);
+  pinMode(BUTTON_B, INPUT_PULLUP);
+  pinMode(BUTTON_C, INPUT_PULLUP);
+
+  // text display tests
+  display.setTextSize(1);
+  display.setTextColor(SH110X_WHITE);
+  display.setCursor(0,0);
+  display.print("Connecting to SSID\n'adafruit':");
+  display.print("connected!");
+  display.println("IP: 10.0.1.23");
+  display.println("Sending val #0");
+  display.display(); // actually display all of the above
+}
+
+void loop() {
+  if(!digitalRead(BUTTON_A)) display.print("A");
+  if(!digitalRead(BUTTON_B)) display.print("B");
+  if(!digitalRead(BUTTON_C)) display.print("C");
+  delay(10);
+  yield();
+  display.display();
+}