latest update

src/i2c/esp32c3_master_i2c/esp32c3_master_i2c.ino

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+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+#define SCREEN_WIDTH 128
+#define SCREEN_HEIGHT 32
+#define OLED_RESET    -1 // No reset pin
+#define OLED_ADDR     0x3C
+
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
+
+void setup() {
+  Serial.begin(115200);
+
+  // Initialize I2C bus (ESP32-C3 default pins)
+  Wire.begin();
+
+  // Scan I2C devices
+  Serial.println("Scanning I2C devices...");
+  // scanI2C();
+
+  // Initialize OLED
+  if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
+    Serial.println("SSD1306 allocation failed");
+    while(1);
+  }
+  display.clearDisplay();
+  display.setTextSize(1);
+  display.setTextColor(SSD1306_WHITE);
+  display.setCursor(0,0);
+  display.println("Hello, ESP32-C3!");
+  display.display();
+}
+
+void scanI2C() {
+  byte error, address;
+  int nDevices = 0;
+  for(address = 1; address < 127; address++ ) {
+    Wire.beginTransmission(address);
+    error = Wire.endTransmission();
+    if (error == 0) {
+      Serial.print("I2C device found at address 0x");
+      if (address<16) Serial.print("0");
+      Serial.println(address, HEX);
+      nDevices++;
+    } else if (error==4) {
+      Serial.print("Unknown error at address 0x");
+      if (address<16) Serial.print("0");
+      Serial.println(address, HEX);
+    }
+  }
+  if (nDevices == 0)
+    Serial.println("No I2C devices found");
+  else
+    Serial.println("Scan complete");
+}
+
+void loop() {
+  // Nothing to do here for this simple example
+  scanI2C();
+  delay(1000);
+}

src/i2c/esp32s3_dual_i2c/esp32s3_dual_i2c.ino

@@ -0,0 +1,47 @@
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+#define OLED_WIDTH 128
+#define OLED_HEIGHT 32
+#define OLED_RESET -1
+#define OLED_ADDR 0x3C
+
+// Master bus 1 (OLED): SDA 2, SCL 3
+#define SDA_1 2
+#define SCL_1 3
+
+// Master bus 2 (just for demo, not slave): SDA 4, SCL 5
+#define SDA_2 4
+#define SCL_2 5
+
+TwoWire I2Cone = TwoWire(0);
+Adafruit_SSD1306 display(OLED_WIDTH, OLED_HEIGHT, &I2Cone, OLED_RESET);
+
+TwoWire I2Ctwo = TwoWire(1);
+
+void setup() {
+  Serial.begin(115200);
+
+  // Initialize first I2C bus (OLED)
+  I2Cone.begin(SDA_1, SCL_1, 100000);
+  if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
+    Serial.println("OLED allocation failed");
+    while(1);
+  }
+  display.clearDisplay();
+  display.setTextSize(1);
+  display.setTextColor(SSD1306_WHITE);
+  display.setCursor(0,0);
+  display.println("Hello, ESP32-S3!");
+  display.display();
+
+  // Initialize second I2C bus (just for demo, not slave)
+  I2Ctwo.begin(0x55, SDA_2, SCL_2, 100000);
+  // You could scan for devices or use another I2C device here
+}
+
+void loop() {
+  // Nothing to do here for this simple example
+  delay(1000);
+}