SPI interface with other board_AVR_ESK1100 or among Arduino itself

Graynomad:
That wasn't a stand-alone program, what happened to all your setup() code (most or which you don't need anyway I think).


Rob

Hi..!!

With this code , attached result is coming.

#include "pins_arduino.h"
#include <SPI.h>

#define size_data 4  // is there 4 bytes? if not change this and the arrays.

byte send_04_data[size_data] = {1,2,3,7}; // you fill in the numbers 
byte send_06_data[size_data] = {3,8,7,9};
byte * data_ptr;
int byte_count = 0;
void setup (void)
{
  
  // 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);
  
 // disable timer interrupts
  TIMSK0 = 0;
  // interrupt for SS falling edge
  //attachInterrupt (0, ss_falling, FALLING);
   // disable timer interrupts
  TIMSK0 = 0;
}
ISR (SPI_STC_vect) {
  byte c = SPDR;
  if (byte_count == 0)
  {
     
      data_ptr = (c == 0x04) ? send_04_data : send_06_data; 
  
  SPDR = *(data_ptr + byte_count);
  byte_count++; }  
  else 
  
  {
    SPDR = 0;      //******** Added
  
  }
  if (byte_count = size_data) 
  byte_count = 0;
} 
void loop (void)
{
 
}  // end of loop

TEK0014.BMP (76.1 KB)

TEK0011.BMP (76.1 KB)

Graynomad:
I can't make out anything from the scope screen shots, there's obviously something happening though.

Tell you what I'll do, against my better judgement I'll try to write you some code for both ends based on what I think you want to do.


Rob

Thank You.

It will be really a great help for me.

Here's some code. I took the razor to what you had and removed everything not required to prove the concept. Hopefully I didn't go too far. The master could still be a lot smaller.

Master

//Master sending data
#include <SPI.h>// include the SPI library:
#define SS_PIN   10

int command_array[] = {0x04, 0x06, 0x08, 0x0A};
int returned_data[4];

void setup() {
  
  pinMode (SS_PIN, OUTPUT);// set the spi_data_pin as an output:

  Serial.begin(115200);
  
  SPI.begin();
  SPI.setDataMode(SPI_MODE2);
  SPI.setClockDivider(SPI_CLOCK_DIV64) ;
  SPI.setBitOrder(LSBFIRST);
 
}

void loop() {
    
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(command_array[0]);       // send command
    delay(1);                             // give the slave some time
    returned_data[0] = SPI.transfer(0);   // get response
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    delay(1);
    SPI.transfer(command_array[1]); 
    returned_data[1] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    delay(1);
    SPI.transfer(command_array[2]); 
    returned_data[2] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    delay(1);
    SPI.transfer(command_array[3]); 
    returned_data[3] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    Serial.print (returned_data[0]);
    Serial.print (',');
    Serial.print (returned_data[1]);
    Serial.print (',');
    Serial.print (returned_data[2]);
    Serial.print (',');
    Serial.println (returned_data[3]);
  
}

Slave

byte response_data[] = {-1,-1,-1,-1,'4',-1,'6',-1,'8',-1,'A'}; 

void setup (void) {
  
  pinMode(MISO, OUTPUT); // have to send on master in, *slave out*
  SPCR |= _BV(SPE);   // turn on SPI in slave mode
  SPCR |= _BV(SPIE);  // turn on interrupts
 
}  

void loop () {}

ISR (SPI_STC_vect) {
  byte command = SPDR;

  SPDR = response_data[command];

}

See if that does anything useful.


Rob

ranjeetray:
Hi...!!

I am reading http://www.gammon.com.au/spi again and again and trying to grasp SPI, but not getting expected results.

Can we write the codes like this, are these correct codes for mater and slave
...
Slave receiving data from master then sending the data back to master, is it right.

...

// SPI interrupt routine
ISR (SPI_STC_vect)
{
 c = SPDR;
 
if(c == 0x04)
 {
   digitalWrite(SS, LOW);
 SPI.transfer(dat[0]);
 SPI.transfer(dat[1]);
  digitalWrite(SS, HIGH);
 
  digitalWrite(SS, LOW);
 SPI.transfer(dat[2]);
 SPI.transfer(dat[3]);
  digitalWrite(SS, HIGH);
 
  digitalWrite(SS, LOW);
 SPI.transfer(dat[4]);
 SPI.transfer(dat[5]);
  digitalWrite(SS, HIGH);
}

else if(c == 0x06)
 {
  digitalWrite(SS, LOW);
 SPI.transfer(dat[6]);
 SPI.transfer(dat[7]);
  digitalWrite(SS, HIGH);
 
  digitalWrite(SS, LOW);
 SPI.transfer(dat[8]);
 SPI.transfer(dat[9]);
  digitalWrite(SS, HIGH);
 
  digitalWrite(SS, LOW);
 SPI.transfer(dat[10]);
 SPI.transfer(dat[11]);
  digitalWrite(SS, HIGH);
}
 else
SPDR = 0x00;    // what to return to the master

}  // end of interrupt service routine (ISR) SPI_STC_vect
...

Look, ranjeetray, you are just ignoring everything I am saying. I said this:

You do not use SPI.transfer in the ISR. Do you have trouble understanding that?

You are ignoring me, you are just making stuff up, and then taking screen shots of the scope output. It won't work.

Graynomad has offered to write an example but that won't help if you don't make an attempt to understand things. Don't just copy and paste and hope for the best.

Graynomad:
Here's some code. I took the razor to what you had and removed everything not required to prove the concept. Hopefully I didn't go too far. The master could still be a lot smaller.

Master

//Master sending data

#include <SPI.h>// include the SPI library:
#define SS_PIN   10

int command_array[] = {0x04, 0x06, 0x08, 0x0A};
int returned_data[4];

void setup() {
 
 pinMode (SS_PIN, OUTPUT);// set the spi_data_pin as an output:

Serial.begin(115200);
 
 SPI.begin();
 SPI.setDataMode(SPI_MODE2);
 SPI.setClockDivider(SPI_CLOCK_DIV64) ;
 SPI.setBitOrder(LSBFIRST);

}

void loop() {
   
   digitalWrite(SS_PIN,LOW);
   SPI.transfer(command_array[0]);       // send command
   delay(1);                             // give the slave some time
   returned_data[0] = SPI.transfer(0);   // get response
   digitalWrite(SS_PIN,HIGH);

digitalWrite(SS_PIN,LOW);
   delay(1);
   SPI.transfer(command_array[1]);
   returned_data[1] = SPI.transfer(0);
   digitalWrite(SS_PIN,HIGH);

digitalWrite(SS_PIN,LOW);
   delay(1);
   SPI.transfer(command_array[2]);
   returned_data[2] = SPI.transfer(0);
   digitalWrite(SS_PIN,HIGH);

digitalWrite(SS_PIN,LOW);
   delay(1);
   SPI.transfer(command_array[3]);
   returned_data[3] = SPI.transfer(0);
   digitalWrite(SS_PIN,HIGH);

Serial.print (returned_data[0]);
   Serial.print (',');
   Serial.print (returned_data[1]);
   Serial.print (',');
   Serial.print (returned_data[2]);
   Serial.print (',');
   Serial.println (returned_data[3]);
 
}




Slave


byte response_data[] = {-1,-1,-1,-1,'4',-1,'6',-1,'8',-1,'A'};

void setup (void) {
 
 pinMode(MISO, OUTPUT); // have to send on master in, slave out
 SPCR |= _BV(SPE);   // turn on SPI in slave mode
 SPCR |= _BV(SPIE);  // turn on interrupts

}

void loop () {}

ISR (SPI_STC_vect) {
 byte command = SPDR;

SPDR = response_data[command];

}




See if that does anything useful.

______
Rob
//Master sending data
#include <SPI.h>// include the SPI library:
#define SS_PIN   10

int command_array[] = {0x04, 0x06, 0x08, 0x0A};
int returned_data[4];

void setup() {
  
  pinMode (SS_PIN, OUTPUT);// set the spi_data_pin as an output:

  Serial.begin(115200);
  
  SPI.begin();
  SPI.setDataMode(SPI_MODE2);
  SPI.setClockDivider(SPI_CLOCK_DIV64) ;
  SPI.setBitOrder(LSBFIRST);
 
}

void loop() {
    
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(command_array[0]);       // send command
    delay(1);                             // give the slave some time
    returned_data[0] = SPI.transfer(0);   // get response
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    delay(1);
    SPI.transfer(command_array[1]); 
    returned_data[1] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    delay(1);
    SPI.transfer(command_array[2]); 
    returned_data[2] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    delay(1);
    SPI.transfer(command_array[3]); 
    returned_data[3] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    Serial.print (returned_data[0]);
    Serial.print (',');
    Serial.print (returned_data[1]);
    Serial.print (',');
    Serial.print (returned_data[2]);
    Serial.print (',');
    Serial.println (returned_data[3]);
  
}

With the following code, attached image 2 and TEK0002 are the output at Master Serial Monitor and on Oscilloscope:

#include "pins_arduino.h"
#include <SPI.h>

#define size_data 4  // is there 4 bytes? if not change this and the arrays.

byte send_04_data[size_data] = {1,2,3,7}; // you fill in the numbers 
byte send_06_data[size_data] = {3,8,7,9};
byte * data_ptr;
int byte_count = 0;
void setup (void)
{
  
  // 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);
  
 // disable timer interrupts
  TIMSK0 = 0;
  
}
ISR (SPI_STC_vect) {
  byte c = SPDR;
  if (byte_count == 0)
  {
     
      data_ptr = (c == 0x04) ? send_04_data : send_06_data; 
  
  SPDR = *(data_ptr + byte_count);
  byte_count++; }  
  else 
  
  {
    SPDR = 0;
  
  }
  if (byte_count = size_data) 
  byte_count = 0;
} 
void loop (void)
{
 
}  // end of loop

With the following code image 3 and TEK0006 are output:

#include "pins_arduino.h"
#include <SPI.h>
byte response_data[] = {1,2,-1,3,'4',-1,'6',-1,'8',-1,'A'}; 
void setup (void)
{
  
  // 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);
  // disable timer interrupts
  TIMSK0 = 0;
 
}

void loop (void)
{
 
}  // end of loop

ISR (SPI_STC_vect) {

  byte command = SPDR;

  SPDR = response_data[command];

} 

But Slave is not sending data back properly.

TEK0002.BMP (76.1 KB)

2.bmp (918 KB)

3.bmp (885 KB)

TEK0006.BMP (76.1 KB)

Do you deliberately not use the code provided to wind us up or what? Why did you change the array and put all the SPI setup code back in?

Use the slave code I posted. It may not be correct but it's a lot better than what you have I think.


Rob

if (byte_count = size_data) 

byte_count = 0;

I think it's a troll.

I've worn a groove in my tablet's screen scrolling through this thread.
Nick, you deserve a medal.

AWOL:
I've worn a groove in my tablet's screen scrolling through this thread.
Nick, you deserve a medal.

I appreciate for your effort.

AWOL:
I've worn a groove in my tablet's screen scrolling through this thread.
Nick, you deserve a medal.

Hi...!!!

I have tried all the possible combinations , Slave is not able to send back data to master for each if conditions.

#include "pins_arduino.h"

#include <SPI.h>

#define SS 10

int dat[24] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14};

byte c;

int m, n ;

void setup (void)

{

  // 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);

 

 // disable timer interrupts

  TIMSK0 = 0;

 

}  // end of setup

 

 

// SPI interrupt routine

ISR (SPI_STC_vect)

{

  c = SPDR;

  if(c == 0x00)

 {

  SPDR = 0x01;

}

  else if(c == 0x06)

 {

 

  SPDR = 0x02;

 }

  else if(c == 0x08)

 {

 

  SPDR = 0x03;

 }

   else if(c == 0x0A)

 {

 

  SPDR = 0x07;

 }

 

else

 SPDR = 0;    // what to return to the master

 

}  // end of interrupt service routine (ISR) SPI_STC_vect

 

void loop (void)

{

 

}  // end of loop

What is the master code? And it might be quicker to just index into an array.

int dat[24] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14};

What is the point of this?

Instead of sending SPDR = 0x01 or, data I was trying to send SPDR = dat[0]; but that also dint work.

[quote author=Nick Gammon link=topic=120454.msg1001647#msg1001647 date=1353307358]
What is the master code? And it might be quicker to just index into an array.
[/quote]
Master code on AVR:


[code]
/**
 * \file

 * Include header files for all drivers that have been imported from
 * AVR Software Framework (ASF).
 */
#include <asf.h>
#include <avr32/io.h>
#include "pm.h"
#include "delay.h"

int16_t *readData,i;	
unsigned int timeout = 1500;
int16_t cmdAddr[30] = {0x0400,0x0600,0x0800,0x0A00,0x0C00,0x0E00,0x1000,0x1200,0x1400};
//int16_t cmdAddr[30] = {0x04, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x08,0x00,0x00, 0x00, 0x0A,0x00, 0x00, 0x00,0x0C, 0x00, 0x00, 0x00, 0x0E, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00};
int main (void)
{
		 pm_switch_to_osc0(&AVR32_PM,12000000,2048); // Switch the main clock to the external oscillator 0
		 delay_init(12000000);						 
	//	 delay_ms(20);								 // busy wait for 20ms

		AVR32_GPIO.port[0].gperc = 1 << 10;			// A peripheral function controls the corresponding pin
		AVR32_GPIO.port[0].gperc = 1 << 11;			// A peripheral function controls the corresponding pin
		AVR32_GPIO.port[0].gperc = 1 << 12;			// A peripheral function controls the corresponding pin
		AVR32_GPIO.port[0].gperc = 1 << 13;			// A peripheral function controls the corresponding pin
		AVR32_GPIO.port[0].pmr0c = 1 << 10;			// To select the peripheral function A
		AVR32_GPIO.port[0].pmr1c = 1 << 10;			// To select the peripheral function A
		AVR32_GPIO.port[0].pmr0c = 1 << 11;			// To select the peripheral function A
		AVR32_GPIO.port[0].pmr1c = 1 << 11;			// To select the peripheral function A
		AVR32_GPIO.port[0].pmr0c = 1 << 12;			// To select the peripheral function A
		AVR32_GPIO.port[0].pmr1c = 1 << 12;			// To select the peripheral function A
		AVR32_GPIO.port[0].pmr0c = 1 << 13;			// To select the peripheral function A
		AVR32_GPIO.port[0].pmr1c = 1 << 13;			// To select the peripheral function A
		
		AVR32_SPI0.MR.mstr = 1;						// SPI operates in MASTER mode
		AVR32_SPI0.MR.modfdis = 0;					// Mode Fault Detection disabled
		AVR32_SPI0.MR.llb = 0;						// Local loop path disabled
		AVR32_SPI0.MR.ps = 0;						// Fixed peripheral is selected
		AVR32_SPI0.MR.pcsdec = 0 ;					// The chip selects are directly connected to a peripheral device
		AVR32_SPI0.MR.dlybcs = 0;					// Delay between chip selects
		
		AVR32_SPI0.MR.pcs = 0xF;					// Peripheral chip select disable
		AVR32_SPI0.CSR0.scbr = 0x28;				// Serial Clock Baud Rate initialized to 40 
		AVR32_SPI0.CSR0.dlybs = 0x0a;				// Delay before serial clock signal (SPCK)
		AVR32_SPI0.CSR0.dlybct = 0x12;				// Delay between consecutive transfers
		AVR32_SPI0.CSR0.csaat = 1;					// Chip Select Active After Transfer
													
		AVR32_SPI0.CSR0.cpol = 1 ;					// Clock polarity  
		AVR32_SPI0.CSR0.ncpha = 0 ;					// Clock phase  
	    AVR32_SPI0.CSR0.bits =0x8;					// Number of data bits transferred. 
		
		while(1)
		{			
				readData = 0x500;
				i = 0;
				AVR32_SPI0.CR.spien = 1;			// Enables the SPI to transfer and receive data
		
					while(i!=9)
					{
						AVR32_SPI0.MR.pcs = 0xE;			// Peripheral Chip Select (CSR0) enable
						while (AVR32_SPI0.SR.tdre != 1);	// Transmit Data Register Empty 
						AVR32_SPI0.TDR.td = cmdAddr[i];		// send command address to TDR register
					    while(AVR32_SPI0.SR.tdre!=1);		// Transmit data ready empty status
						AVR32_SPI0.TDR.td = 0x0000;			
						while(AVR32_SPI0.SR.rdrf!=1);		// Read data register full status
						readData[i] = AVR32_SPI0.RDR.rd;    // Store read data into an array
						i++;
						AVR32_SPI0.MR.pcs = 0xF;            // Disable the peripheral chip select (CSR0)
					   delay_ms(2);
				   }			
			
				AVR32_SPI0.CR.spidis = 1;			// Disables the SPI, it finishes its transfer
				delay_ms(20);                       // busy wait for 20ms
		}								
				while(1);
}

And Master AVR is reading just FFFFFFFFFFFFFFFFF , what could be the reason.

Master code on Arduino

//Master sending data
#include <SPI.h>// include the SPI library:
#define SS_PIN   10

int command_array[] = {0x04, 0x06, 0x08, 0x0A};
int returned_data[4];

void setup() {
  
  pinMode (SS_PIN, OUTPUT);// set the spi_data_pin as an output:

  Serial.begin(115200);
  
  SPI.begin();
  SPI.setDataMode(SPI_MODE2);
  SPI.setClockDivider(SPI_CLOCK_DIV64) ;
  SPI.setBitOrder(LSBFIRST);
 
}

void loop() {
    
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(command_array[0]);       // send command
    //delay(1);                             // give the slave some time
    returned_data[0] = SPI.transfer(0);   // get response
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    //delay(1);
    SPI.transfer(command_array[1]); 
    returned_data[1] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    //delay(1);
    SPI.transfer(command_array[2]); 
    returned_data[2] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    //delay(1);
    SPI.transfer(command_array[3]); 
    returned_data[3] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    Serial.print (returned_data[0]);
    Serial.print (',');
    Serial.print (returned_data[1]);
    Serial.print (',');
    Serial.print (returned_data[2]);
    Serial.print (',');
    Serial.println (returned_data[3]);
  
}

Master code on Arduino Again

//Master Program
#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[30] = {0x04, 0x00, 0x00, 0x00,  0x06, 0x00,0x00, 0x00,  0x08,0x00, 0x00, 0x00, 0x0A, 0x00, 0x00, 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);
  digitalWrite(spidata,LOW);
 
}

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

    //delay(14);
   digitalWrite(spidata,LOW);
   SPI.transfer(array[0]); 
   //delay(1);
   SPI.transfer(array[1]);
  // delay(1);
   digitalWrite(spidata,HIGH);
    //delay(14);
   
   digitalWrite(spidata,LOW);
   SPI.transfer(array[2]); 
   //delay(1);
   SPI.transfer(array[3]);
  // delay(1);
   digitalWrite(spidata,HIGH);
   // delay(14);
   
   digitalWrite(spidata,LOW);
   SPI.transfer(array[4]); 
   //delay(1);
   SPI.transfer(array[5]);
   //delay(1);
   digitalWrite(spidata,HIGH);
    //delay(1);
   
   digitalWrite(spidata,LOW);
   SPI.transfer(array[6]); 
   //delay(1);
   SPI.transfer(array[7]);
  // delay(1);
   digitalWrite(spidata,HIGH);
   
     digitalWrite(spidata,LOW);
   SPI.transfer(array[8]);
 // delay(1); 
   SPI.transfer(array[9]);
   //delay(1);
   digitalWrite(spidata,HIGH);
   
      digitalWrite(spidata,LOW);
   SPI.transfer(array[10]);
 // delay(1); 
   SPI.transfer(array[11]);
  // delay(1);
   digitalWrite(spidata,HIGH);
  //delay(1); 
   
     digitalWrite(spidata,LOW);
   SPI.transfer(array[12]); 
   //delay(1);
   SPI.transfer(array[13]);
  // delay(1);
   digitalWrite(spidata,HIGH);
   // delay(14);
   
   digitalWrite(spidata,LOW);
   SPI.transfer(array[14]); 
   //delay(1);
   SPI.transfer(array[15]);
  // delay(1);
   digitalWrite(spidata,HIGH);
   // delay(14);
   
   digitalWrite(spidata,LOW);
   SPI.transfer(array[16]); 
   //delay(1);
   SPI.transfer(array[17]);
  // delay(1);
   digitalWrite(spidata,HIGH);
   //delay(14);
   
     digitalWrite(spidata,LOW);
   SPI.transfer(array[18]); 
   //delay(1);
   SPI.transfer(array[19]);
   //delay(1);
   digitalWrite(spidata,HIGH);
   
      digitalWrite(spidata,LOW);
   SPI.transfer(array[20]); 
   //delay(1);
   SPI.transfer(array[21]);
  // delay(1);
   digitalWrite(spidata,HIGH);
   
    digitalWrite(spidata,LOW);
   SPI.transfer(array[22]);
 // delay(1); 
   SPI.transfer(array[23]);
  // delay(1);
   digitalWrite(spidata,HIGH);
  //  delay(14);
    }

Slave code on Arduino

//Slave Code
#include "pins_arduino.h"
#include <SPI.h>
#define SS 10
int dat[24] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14};
byte c;
int m, n ;
void setup (void)
{
  // 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);
  
 // disable timer interrupts
  TIMSK0 = 0;
  
}  // end of setup
 
 
// SPI interrupt routine
ISR (SPI_STC_vect)
{
  c = SPDR;
  if(c == 0x04)
 {
  SPDR = 0x01;
}
  else if(c == 0x06)
 {
 
  SPDR = 0x02;
 }
  else if(c == 0x08)
 {
 
  SPDR = 0x03;
 }
   else if(c == 0x0A)
 {
 
  SPDR = 0x07;
 }
 
//else
 //SPDR = 0;    // what to return to the master
 
}  // end of interrupt service routine (ISR) SPI_STC_vect
 
void loop (void)
{
 
}  // end of loop

Exceeding the 9500 charecters.

[/code]

Other Slave codes are:

#include <SPI.h>
#define MAX_BYTES 4  // is there 4 bytes? if not change this and the arrays.

byte cmd_04_data[MAX_BYTES] = {1,2,3,4}; // you fill in the numbers 
byte cmd_06_data[MAX_BYTES] = {5,6,7,8};
byte * data_ptr;
int byte_count = 0;
void setup (void)
{
  
  // 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);
  
 // disable timer interrupts
  TIMSK0 = 0;
  
}
ISR (SPI_STC_vect) {
  byte c = SPDR;
  if (byte_count == 0) {
      // set a pointer to one or other array based on the byte just received
      data_ptr = (c == 0x04) ? cmd_04_data : cmd_06_data; 
  }
  SPDR = *(data_ptr + byte_count);
  byte_count++;   
  if (byte_count = MAX_BYTES) byte_count = 0;
}  
void loop (void)
{
 
}  // end of loop
byte response_data[] = {-1,-1,-1,-1,'4',-1,'6',-1,'8',-1,'A'}; 

void setup (void) {
  
  pinMode(MISO, OUTPUT); // have to send on master in, *slave out*
  SPCR |= _BV(SPE);   // turn on SPI in slave mode
  SPCR |= _BV(SPIE);  // turn on interrupts
 
}  

void loop () {}

ISR (SPI_STC_vect) {
  byte command = SPDR;

  SPDR = response_data[command];

}

Master code on Arduino
...
Master code on Arduino Again
...
Other Slave codes are:

What?

Hi..!!

I mean to say that I have tried both the way on Arduino in Master , with delay and without delay also, but still does not respond properly.
I tried all the combination of master and slave but slave is not able to send back data for multiple if conditions or multiple SPDR = data.

And AVR EVK1100 master is reading FFFFFFFFFFFFF from slave Arduino board.

You are going to have to post code for a master, and a slave, and describe what is going wrong. Not lots of codes for each. And not "does not respond properly".

We are up to page 8 and your posts are as vague as a violet.

Ok. I apologize for this.

//Master sending data

#include <SPI.h>// include the SPI library:
#define SS_PIN   10

int command_array[] = {0x04, 0x06, 0x08, 0x0A};
int returned_data[4];

void setup() {
  
  pinMode (SS_PIN, OUTPUT);// set the spi_data_pin as an output:

  Serial.begin(115200);
  
  SPI.begin();
  SPI.setDataMode(SPI_MODE2);
  SPI.setClockDivider(SPI_CLOCK_DIV64) ;
  SPI.setBitOrder(LSBFIRST);
 
}

void loop() {
    
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(command_array[0]);       // send command
    //delay(1);                             // give the slave some time
    returned_data[0] = SPI.transfer(0);   // get response
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    //delay(1);
    SPI.transfer(command_array[1]); 
    returned_data[1] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    //delay(1);
    SPI.transfer(command_array[2]); 
    returned_data[2] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    digitalWrite(SS_PIN,LOW);
    //delay(1);
    SPI.transfer(command_array[3]); 
    returned_data[3] = SPI.transfer(0);
    digitalWrite(SS_PIN,HIGH);

    Serial.print (returned_data[0]);
    Serial.print (',');
    Serial.print (returned_data[1]);
    Serial.print (',');
    Serial.print (returned_data[2]);
    Serial.print (',');
    Serial.println (returned_data[3]);
  
}

Slave code for sending back data:

//Slave Code
#include "pins_arduino.h"
#include <SPI.h>
#define SS 10

byte c;
int m, n ;
void setup (void)
{
  // 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);
  
 // disable timer interrupts
  TIMSK0 = 0;
  
}  // end of setup
 
 
// SPI interrupt routine
ISR (SPI_STC_vect)
{
  c = SPDR;
  if(c == 0x04)
 {
  SPDR = 0x01;
}
  else if(c == 0x06)
 {
 
  SPDR = 0x02;
 }
  else if(c == 0x08)
 {
 
  SPDR = 0x03;
 }
   else if(c == 0x0A)
 {
 
  SPDR = 0x07;
 }
 
else
 SPDR = 0;    // what to return to the master
 
}  // end of interrupt service routine (ISR) SPI_STC_vect
 
void loop (void)
{
 
}  // end of loop

This combination of Master and Slave code I have tried but Slave is not able to send back data to Master, I have observed in Oscilloscope MISO is not having data. What could be the reason.