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// Wire Master Writer
// by Nicholas Zambetti <http://www.zambetti.com>

// Demonstrates use of the Wire library
// Writes data to an I2C/TWI slave device
// Refer to the "Wire Slave Receiver" example for use with this

// Created 29 March 2006
// Modified 23 June 2017 by Papaan

#include <Wire.h>

byte x[2];  //for a serial number
const int startButton = 7;

void setup() {
  Wire.begin(); // join i2c bus (address optional for master)
  pinMode(startButton, INPUT);
  Serial.begin(115200);//Arduino IDE 1.0.6
  //Serial.begin(230400);//Arduino IDE 1.6.7
  Serial.println("===Transmit Start===");
  showButtonState();
  x[0] = 0;
  x[1] = 0;
}

void loop() {
  debugPrint("You can write keywords");//ここは適当な文字列
  debugRegPrint("TWBR*", TWBR); //read TWBR reg.  レジスター名には*をつける
  debugRegPrint("TWSR*", TWSR); //read TWSR reg.
  debugIntPrint("2byteReg*", 3841);//ex. 0xF01
  debugIntPrint("Integer", 11000);//ex. 11000
  breakPoint();
}

void showButtonState(void) {
  Serial.print("startButton = ");
  Serial.println(startButton);
  Serial.print("buttonState = ");
  Serial.println(digitalRead(startButton));
}

void debugPrint(char thisStr[]) {
  Wire.beginTransmission(8); // transmit to device #8
  Wire.write(thisStr);        // sends charcters
  Wire.write(x[0]);           // sends one byte
  Wire.write(x[1]);           // sends one byte
  Wire.endTransmission();     // stop transmitting
  if (x[0] == 255){
    x[1]++;
  }
  x[0]++;
}

void debugRegPrint(char thisStr[], byte regValue) {
  Wire.beginTransmission(8);  // transmit to device #8
  Wire.write(thisStr);        // sends charcters
  Wire.write(regValue);       // sends one byte
  Wire.write(0);              // dummy byte（debugPrintと揃える為）
  Wire.endTransmission();     // stop transmitting
}

void debugIntPrint(char thisStr[], int variable) {
  Wire.beginTransmission(8);  // transmit to device #8
  Wire.write(thisStr);        // sends charcters
  Wire.write((byte)variable); // sends low byte
  Wire.write((byte)(variable >> 8));// sends high byte
  Wire.endTransmission();     // stop transmitting
}

void breakPoint(void) {
  while (1) {
    if (digitalRead(startButton) == LOW) {
      showButtonState();
      delay(500);//wait a finger to take off
      break;
    }
  }
}