prob in interfacing the adns 2610 with atmega16 using SPI

[gaurav yadav]

i m trying to interface adns 2610 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>
#define BAUD_RATE 71
//DEFINING THE SPI PORT OF MICROCONTROLLER
#define DDR_SPI DDRB
#define SCK 7  //PORTB.7
#define MISO 6 //PORTB.6
#define MOSI 5 //PORTB.5
#define cbi(port,bit) (port)&=~(1<<(bit))
#define sbi(port,bit) (port)|=(1<<(bit))
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 OF SPI
{
SPCR=(1<<SPE)|(1<<MSTR); //ENABLE SPI AND MAKE IT MASTER
SPCR|=(1<<CPOL); //it 0 CLOCK TRALLING EDGE IS 1, LEADING EDGE IS 0
SPCR|=(1<<SPR0); // SELECTING MODE 2 FOR SCLK (Fosc/16)
SPCR&=~(1<<DORD); //MSB FIRST DORD=0,LSB=1
SPCR&=~(1<<CPHA); //SETING BIT ON FALLING EDGE OF SCLK CPHA=0
DDR_SPI&= ~(1<<MOSI)  &  ~(1<<MISO);//MAKING MISO AND MOSI INPUT FOR TRISTAING IT
PORTB|=(1<<MISO)|(1<<MOSI);//TRISTATING BOTH MISO AND MOSI
DDRB|=(1<<SCK);//MAKING SCK OUTPUT AFTER MOSI AND MISO IS TRISTATING TO OVERCOME SYNC PROB
}




// MINIMUM DIFF B/W TWO WRITE SHOULD BE 100usec
void ADNS_WRITE(unsigned char addr,unsigned char data)
{

SPCR&=~(1<<CPHA); //SET BIT ON FALLING EDGE 
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&=~(1<<MOSI);//MAKING MOSI INPUT FOR TRISTAING IT
PORTB|=(1<<MISO)|(1<<MOSI);//TRISTATING THE MISO AND MOSI PIN BY WRITING PORT=1
}





// THE MINIMUM DIFFERENCE BETWEEN TWO READ OR WRITE SHOULD BE 250ns
unsigned char ADNS_READ(unsigned char adr)
{

SPCR&=~(1  << CPHA);   //SETTING DATA ON LEADING EDGE OF CLOCK

adr &=~(1<<7); //MSB OF ADDRESS SHOULD BE 0 IN READ OP
DDR_SPI|=(1<<SCK);
DDR_SPI|=(1<<MOSI);
SPDR=adr;

while(!(SPSR  & (1<<SPIF)))
{}

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

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


SPCR|=(1<<CPHA);//Up will read on rising pulse of sck
PORTB&=  ~(1<<MISO);//CHANGI MISO FROM TRISATE TO INPUT PIN
DDR_SPI|= (1<<SCK);
while(!(SPSR  &  (1<<SPIF)))
{}
DDR_SPI&=  ~(1<<MISO);
PORTB&=  ~(1<<MISO);
return SPDR;
}
color=blue][/color]

 

[nurag007]

hi,
Did u get it working? Im facing the same problem with the code!!

regards,

 

[gaurav yadav]

i got it working by bit banging. means writing whole protocol in software ..

---------- Post added at 17:43 ---------- Previous post was at 17:37 ----------

sorry for late reply
this code of mine is not totally correct...
and than to if u want to interface adns 2610 through harware SPI of atmega16 u will need one transistor and some more things .
so i used bit banging instead means wrote whole protocol in software.

if u need more help just post your code and give more detail.