#include <TinyWireS.h>
//#include <SoftwareSerial.h>
#define I2C_SLAVE_ADDRESS 0x4

#include <avr/io.h>
#include <util/delay.h>

volatile uint8_t i2c_regs[7];
volatile byte reg_position = 0;
const byte reg_size = sizeof(i2c_regs);

//SoftwareSerial ss(0,1);

void setup() {
  // put your setup code here, to run once:
  pinMode(trg, OUTPUT);
  pinMode(ech, INPUT);
 
  TinyWireS.begin(I2C_SLAVE_ADDRESS);
  TinyWireS.onRequest(requestEvent);
  //ss.begin(9600);
}


void loop() {
  // put your main code here, to run repatedly:

  
}


void requestEvent(){



  i2c_regs[0] = 'H';
  i2c_regs[1] = 'E';
  i2c_regs[2] = 'L';
  i2c_regs[3] = 'L';
  i2c_regs[4] = 'O';
  i2c_regs[5] = '!';
  i2c_regs[6] = ' '; 
  
  int n = reg_size - reg_position;
  for(int i = reg_position; i< n; i++){
    TinyWireS.send(i2c_regs[reg_position]);
    reg_position++;
    if(reg_position >= reg_size){
      reg_position = 0;
    }
  }

 
}