SPI interface with other board_AVR_ESK1100 or among Arduino itself

Using Arduino Networking, Protocols, and Devices
70

Hi..!!!

Yes.

I have read this again and again, but still problem is there.
From master I am sending following data (int array[8] = {0x04, 0x00, 0x06, 0x00, 0x08, 0x00, 0x0A, 0x00}:wink: and on slave side I am receiving the same data. But same data are available on both MOSI and MISO.
I can see on oscilloscope that even MISO line has the same data which are ( int array[8] = {0x04, 0x00, 0x06, 0x00, 0x08, 0x00, 0x0A, 0x00}:wink: on MOSI also.
But from slave side I am not sending any data then why data are available on line(MISO), is there any way to clear buffer or SPDR.

//Master sending data

//Master sending data
#include <SPI.h>// include the SPI library:
#define SCK_PIN   13
#define MISO_PIN  12
#define MOSI_PIN  11

const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
int array[8] = {0x04, 0x00, 0x06, 0x00, 0x08, 0x00, 0x0A, 0x00};
int chr;

void setup() {
  
  pinMode (spidata, OUTPUT);// set the spi_data_pin as an output:
  
  SPI.begin();// initialize SPI:
  Serial.begin(115200);
  SPI.setDataMode(SPI_MODE2);
  SPI.setClockDivider(SPI_CLOCK_DIV64) ;
  SPI.setBitOrder(LSBFIRST);
 
}

void loop() {
  int data[10];
  char ch;
 

    
   digitalWrite(spidata,LOW);
   SPI.transfer(array[0]); 
   SPI.transfer(array[1]);
   digitalWrite(spidata,HIGH);
   
   digitalWrite(spidata,LOW);
   SPI.transfer(array[2]); 
   SPI.transfer(array[3]);
   digitalWrite(spidata,HIGH);
   
   digitalWrite(spidata,LOW);
   SPI.transfer(array[4]); 
   SPI.transfer(array[5]);
   digitalWrite(spidata,HIGH);
   
   digitalWrite(spidata,LOW);
   SPI.transfer(array[6]); 
   SPI.transfer(array[7]);
   digitalWrite(spidata,HIGH);
   

    }

//Slave receiving data

//Slave receiving data
#include "pins_arduino.h"
#include <SPI.h>

// what to do with incoming data
byte command = 0;

void setup (void)
{
  Serial.begin(115200);
  // have to send on master in, *slave out*
  pinMode(MISO, OUTPUT);
  SPI.setBitOrder(MSBFIRST);
  SPI.setDataMode (SPI_MODE2);
  SPI.setClockDivider(SPI_CLOCK_DIV64) ;

  // turn on SPI in slave mode
  SPCR |= _BV(SPE);

  // turn on interrupts
  SPCR |= _BV(SPIE);

}  // end of setup


// SPI interrupt routine
ISR (SPI_STC_vect)
{
  byte c = SPDR;
  Serial.println(c, HEX);
}


void loop (void)
{
  
  // if SPI not active, clear current command
  if (digitalRead (SS) == HIGH)
    command = 0;
}  // end of loop