spi to i2c - lado slave - post

// Gravado num Arduino Pro Mini
// spi to i2c - lado slave
// www.copacabana.io
// work in progress. Editarei esse pastebin atualizando as funções

//-----------------preparacao do sensor tipo K SPI
#include "max6675.h"
int ktcSO = 12;
int ktcCS = 10;
int ktcCLK = 13;
MAX6675 ktc(ktcCLK, ktcCS, ktcSO);
//_________________________________________________

#include <Wire.h>
#include <SPI.h> // made no diference!

#define XSensorPin A1
#define YSensorPin A2

const byte SlaveDeviceId = 1;
byte LastMasterCommand = 0;

int temperatura;  // é float, mas só quero ler inteiro (1 byte)

void softReset() { asm volatile ("  jmp 0"); }
void pisca(){
     digitalWrite(13,HIGH);
   delay(50);
   digitalWrite(13,LOW);
}
void setup(){
  pinMode(13,OUTPUT);

  Serial.begin(9600);
  Serial.println("boot");
  Wire.begin(SlaveDeviceId);      // join i2c bus with Slave ID
  Wire.onReceive(receiveCommand); // register talk event
  Wire.onRequest(slavesRespond);  // register callback event

  pinMode(XSensorPin, INPUT);
  pinMode(YSensorPin, INPUT);
}


void lerSPI(){
    temperatura = 0;
      // basic readout test over SPI
   Serial.print("Leitura local (slave) Deg C = ");
   temperatura = (int) (ktc.readCelsius());
   Serial.println(temperatura);

   delay(500);

}









void loop(){











  delay(100);
}

void receiveCommand(int howMany){
  LastMasterCommand = Wire.read(); // 1 byte (maximum 256 commands)
}

void slavesRespond(){

  int returnValue = 0;

  switch(LastMasterCommand){
    case 0:   // No new command was received
      Wire.write("NA");
                          delay(100);
    break;

    case 1:   // Return X sensor value
      returnValue = GetXSensorValue();
   // softReset();
                           delay(100);

    break;

    case 2:   // Return Y sensor value
      returnValue = GetYSensorValue();
                          delay(100);

    break;


  }

  byte buffer[2];                 // split int value into two bytes buffer
  buffer[0] = returnValue >> 8;
  buffer[1] = returnValue & 255;
  Wire.write(buffer, 2);          // return response to last command
  LastMasterCommand = 0;          // null last Master's command
}

int GetXSensorValue(){
  int val = (int) (ktc.readCelsius()); //analogRead(XSensorPin);
  Serial.print(val);
  Serial.println("  leitura local");
  Serial.println(ktc.readCelsius());
  return val;
}

int GetYSensorValue(){
  int val = analogRead(YSensorPin);
  return val;
}