plz help-prob in with using of SPI in atmega16

[gaurav yadav]

basically i want help on SPI
but i m trying to interface adns 2610 optical mouse sensor with atmega 16 using SPI but its not responding
soo can somebody help me ths is my code

define F_CPU 11059200UL 
#include<avr/io.h> 
#include<util/delay.h> 

//DEFINING THE SPI PORT OF MICROCONTROLLER 
#define DDR_SPI DDRB 
#define SCK 7  
#define MISO 6  
#define MOSI 5 

void INIT_SPI(void);//initializing the spi of the uP 
void ADNS_WRITE(unsigned char,unsigned char);//writing to adns (data,address) 
unsigned char ADNS_READ(unsigned char);//reading from adns inputting the address of register and getting data 


void SPI_INIT(void)    //INTIALIZATION 
{ 
SPCR=(1<<SPE)|(1<<MSTR); 
SPCR|=(0<<CPOL);// CLOCK TRALLING EDGE IS 1, LEADING EDGE IS 0 
SPCR|=(1<<SPR0);// SELECTING MODE 2 FOR SCLK (Fosc/16) 
SPCR|=(0<<DORD);//MSB FIRST 
SPCR|=(1<<CPHA);//SETING BIT ON FALLING EDGE OF SCLK 
DDR_SPI|=(0<<MOSI)|(0<<MISO); 
PORTB|=(1<<MISO)|(1<<MOSI);// MISO AND MOSI IN HI Z 
DDRB=(1<<SCK);//MAKING SCK OUTPUT AFTER MOSI AND MISO IS in Hi Z 
// SO THAT NO SYNC PROBLEM 
} 




// MINIMUM DIFF B/W TWO WRITE SHOULD BE 100usec 
void ADNS_WRITE(unsigned char addr,unsigned char data) 
{ 
addr|=(1<<7);//MSB OF ADDRESS SHOULD BE 1 IN WRITE OP 
SPDR=addr; 
DDR_SPI|=(1<<MOSI);//OPENING MOSI 
while(!(SPSR  &  (1<<SPIF))) 
{} 


SPDR=data; 
while(!(SPSR  &  (1<<SPIF))) 
{} 
DDR_SPI|=(0<<MOSI);// 
PORTB|=(1<<MISO)|(1<<MOSI);//TRISTATING THE MISO AND MOSI 
} 





// THE MINIMUM DIFFERENCE BETWEEN TWO READ OR WRITE SHOULD BE 250ns 
unsigned char ADNS_READ(unsigned char addr1) 
{ 
addr1|=(1<<7 ); //MSB OF ADDRESS SHOULD BE 0 IN READ OP 
SPDR=addr1; 
DDR_SPI|=(1<<MOSI); 
while(!(SPSR  & (1<<SPIF))) 
{} 

//HOLD LAST BIT OF ADDRESS FOR MORE THAN 250ns 
DDR_SPI|=(0<<MOSI); 
PORTB|=(1<<MOSI);//MAKING MISO HI Z 

_delay_ms(1);//DELAY SO THAT ADNS-2610 CAN PREPARE DATA 


PORTB=(0<<MISO);//CHANGI MISO FROM TRISATE TO INPUT PIN 
while(!(SPSR  &  (1<<SPIF))) 
{} 
return SPDR; 
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