Photon SPI Arduino

Firmware Libraries
1

The SPI connection between Photon (master) and Arduino (slave) seems not to work as expected.
I am trying with the following code.
Photon master:

void setup()
{
  pinMode(A2, OUTPUT);

  SPI.begin(SPI_MODE_MASTER, A2);
  SPI.setBitOrder(MSBFIRST);
  SPI.setClockDividerReference(SPI_CLK_ARDUINO);
  SPI.setClockDivider(SPI_CLOCK_DIV16);
  SPI.setDataMode(SPI_MODE0);

  Serial.begin(9600);
}

void loop()
{
  digitalWrite(A2, LOW);
  SPI.transfer(0x5A);
  digitalWrite(A2, HIGH);
  Serial.println(0x5A);
  Serial.println("Sending...");
  delay(5000);
}

Arduino slave:

#include<SPI.h>

volatile boolean received;
volatile byte receivedData;

ISR (SPI_STC_vect)        //Inerrrput routine function 
{
  receivedData = SPDR;   // Get the received data from SPDR register
  received = true;       // Sets received as True 
}

void setup()
{
  Serial.begin(115200);

  pinMode(MISO,OUTPUT);   //Sets MISO as OUTPUT
  SPCR |= _BV(SPE);       //Turn on SPI in Slave Mode
  received = false;
  SPI.attachInterrupt();  //Activate SPI Interuupt 
}


void loop()
{ 
  if(received) {                        
    received = false;
    Serial.print(receivedData, HEX);
  }
}

Interruption doesn’t happen on Arduino. Is there anything missing in my code?

2

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