example_i2c.cpp

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#include <Arduino.h>
 
#include "Wire.h"
 
static const uint8_t dev_addr = 0x20;
static const int sda_pin = 0;
static const int scl_pin = 1;
 
uint8_t i = 0;
 
uint8_t buffer[32] = "world";
 
void onRequest() {
  // prewrite to buffer
  Wire.write(buffer, 5);
 
  Serial.printf("onRequest: %02x\n", i++);
}
 
void onReceive(int len) {
  Serial.printf("onReceive[%d]: ", len);
 
  while (Wire.available()) {
    Serial.write(Wire.read());
  }
  Serial.println();
}
 
void setup() {
  Serial.begin(115200);
 
  Wire.onReceive(onReceive);
  Wire.onRequest(onRequest);
 
  Wire.begin(dev_addr, sda_pin, scl_pin, 400000);
}
 
void loop() {}