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libraries/Wire/examples/i2c_slave/i2c_slave.ino

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+// I2C slave
+#include <Wire.h>
+
+// The address on the I2C bus that we will assign to this device
+constexpr int MY_ADDRESS = 0x33;
+
+// Buffers for sending and receiving
+uint8_t slaveTxData[4] = {0x00, 0x10, 0x22, 0x84};
+uint8_t slaveRxData[8] = {0};
+
+// Function for receiving data from the I2C bus
+uint8_t slaveGetData(uint8_t *buf, uint8_t bufSize)
+{
+  // If there are bytes available for reading, read them in a loop
+  uint8_t n = 0;
+  while (Wire.available()) 
+  {
+    // Read from the bus - from the master device
+    buf[n] = Wire.read();
+    // If the entire buffer is filled, stop reading
+    if (++n == bufSize)
+      break;
+  }
+  // Return the number of received bytes
+  return n;
+}
+
+// Function for sending data via I2C bus
+uint8_t slaveSendData(uint8_t* data, uint8_t dataLen)
+{
+  return Wire.write(data, dataLen);
+}
+
+// A function that will be called if the master requests data
+void requestEvent() 
+{
+  Serial.println("------------------------");
+  Serial.println("Slave | Request event");
+
+  // Send data
+  uint8_t txBytesQty = slaveSendData(slaveTxData, sizeof(slaveTxData));
+  // Show result
+  if (txBytesQty == sizeof(slaveTxData))
+    Serial.print("Slave | Bytes quantity sent: ");
+  else
+    Serial.print("Slave | Send ERROR! Bytes quantity sent: ");
+  Serial.println(txBytesQty);
+
+  slaveTxData[0] += 1; // Change the first byte for variety
+}
+
+// Function that will be called if the master sends data
+void receiveEvent(int bytesNum)
+{
+  Serial.println("------------------------");
+  Serial.println("Slave | Receive event");
+
+  // Get new data
+  uint8_t rxBytesQty = slaveGetData(slaveRxData, sizeof(slaveRxData));
+  // Show result
+  if (rxBytesQty == 0)
+    Serial.println("Slave | Receive ERROR!");
+  else
+  {
+    for (uint8_t i = 0; i < rxBytesQty; i++)
+    {
+      Serial.print("Slave | Received byte: 0x");
+      Serial.println(slaveRxData[i], HEX);
+    }
+  }
+}
+
+// ----------------------------------------- //
+void setup() 
+{  
+  Serial.begin(115200);
+  while (!Serial);
+  Serial.println("I2C slave start");  
+
+  // Start working with I2C as a slave device with the address MY_ADDRESS
+  Wire.begin(MY_ADDRESS);    
+  // Register an event handler that will be called when data is requested by the master device
+  Wire.onRequest(requestEvent);
+  // Register an event handler that will be called after receiving data from the master device
+  Wire.onReceive(receiveEvent);
+}
+
+void loop() 
+{
+  // Don't do anything in the loop, everything is implemented in the registered event handlers
+}