ESP32-S3 AMOLED Interface

#include <Arduino.h>
#include <Wire.h>


// Forward declarations
void scanI2cBus();

constexpr uint8_t I2C_SDA_PIN = 15;
constexpr uint8_t I2C_SCL_PIN = 14;
constexpr uint32_t SERIAL_BAUD = 115200;
constexpr uint32_t SCAN_INTERVAL_MS = 5000;

uint32_t lastScanMs = 0;

void scanI2cBus() {
  uint8_t found = 0;
  Serial.println("Scanning built-in I2C devices...");

  for (uint8_t address = 1; address < 127; ++address) {
    Wire.beginTransmission(address);
    if (Wire.endTransmission() == 0) {
      Serial.printf("  Found device at 0x%02X\n", address);
      ++found;
    }
  }

  if (found == 0) {
    Serial.println("  No device replied. Confirm this is the Waveshare AMOLED board.");
  } else {
    Serial.printf("  %u built-in device(s) replied.\n", found);
  }
}

void setup() {
  Serial.begin(SERIAL_BAUD);
  delay(500);
  Serial.println();
  Serial.println("Waveshare ESP32-S3-Touch-AMOLED-2.16 starter");
  Serial.println("USB serial is ready.");

  // GPIO15 and GPIO14 are the board's built-in I2C data and clock lines.
  Wire.begin(I2C_SDA_PIN, I2C_SCL_PIN);
  scanI2cBus();
  lastScanMs = millis();
}

void loop() {
  if (millis() - lastScanMs >= SCAN_INTERVAL_MS) {
    scanI2cBus();
    lastScanMs = millis();
  }
}