#include <Wire.h>
#define I2CADDRESS 0x40  // x100 0000 7bit address
#define LED 12
uint8_t buf[6];
void setup() {
  Wire.begin(2, 14);      //SDA:IO2  SCK:IO14
  Wire.setClock(100000);  //default 100kbps
  Serial.begin(115200);
  Serial.println();
  Serial.println();
  Serial.println("I2C Master:ESP8266  Slave:0x40(PIC16F1503)");
  for (uint8_t i = 0; i < 6; i++) buf[i] = 0;
}

void I2C_PIC() {
  unsigned char c;
  char k;
  Wire.beginTransmission(I2CADDRESS);
  Wire.write(0xa0);
  Wire.write(0x0a);
  Wire.write(0x41);
  Wire.endTransmission();
  Wire.requestFrom(I2CADDRESS, 4);

  Serial.print("   RESPONSE:");
  for (k = 0; k < 4; k++) {
    c = Wire.read();
    Serial.print(c);
    Serial.print(" ");
  }
  Serial.println();
}

void loop() {
  for (int i = 0; i < 5; i++) {
    I2C_PIC();
    delay(5);
  }
  while (1) {delay(10);} //WDT Reset防止
}