spi embedded c code for atmega 16

#include<stdio.h>
#include<aduc841.h>
/******************************************************************
DEFINE CONTROL PINS OF ADUC841 FOR THE PURPOSE OF AD7792 CONTROL.
Customers should define the pins according to their design.

******************************************************************/
sbit CS=0x0A0;
sbit SCLOCK=0x0A6;
sbit DIN=0x0A2;
sbit DOUT=0x0A3;

unsigned char DataRead[3];


void WriteToReg(unsigned char ByteData);
void ReadFromReg(unsigned char nByte);
void Delay(unsigned int Time)
{

	while(Time)
	{
		Time--;
	}
}


void main()
{

	int ResetTime;
	/* Set up UART */
	T3CON = 0x086;
	T3FD = 0x08;
	SCON   = 0x052;
	
	printf("Hello\r\n");

	/* PRECONFIGURE...*/
	ResetTime=32;
	SCLOCK=1;

 	CS=0;		  //to keep DIN=1 for 32 sclock to reset the part
 	DIN=1;
 	while(ResetTime--)
	{
		Delay(10);
		SCLOCK=0;
		Delay(10);
 		SCLOCK=1;
	}
 	CS=1;	
	
    printf("Reset\r\n");
	
	
	WriteToReg(0x10); //write to Communication register.The next step is writing to Configuration register.
	WriteToReg(0x00); //set the Configuration bipolar mode.Gain=1.
	WriteToReg(0x80); //Configuration internal reference selected.

	while(1)
	{
	
		WriteToReg(0x08);//write to Communication register.The next step is writing to Mode register.
		WriteToReg(0x20);//set the mode register as single conversion mode.
		WriteToReg(0x00);//inter 64 kHZ clock.internal clock is not available at the clk pin.
		
	   
		
		
		WriteToReg(0x40);//write to Communication register.The next step is to read from Status register.
		ReadFromReg(1);	
		while((DataRead[0]&0x80)==0x80)//wait for the end of convertion by polling the status register RDY bit
	 
		{
		  
			WriteToReg(0x40); 
			ReadFromReg(1);	
		}
		 
		 
		
		WriteToReg(0x58);//write to Communication register.The next step is to read from Data register.
		ReadFromReg(2);	
		printf("Data:%02BX %02BX\r\n",DataRead[0],DataRead[1]); 

        
       
	}

}    


void WriteToReg(unsigned char ByteData) // write ByteData to the register
{
	unsigned char temp;
	int i;	
	CS=0;
	temp=0x80;
	for(i=0;i<8;i++)
	{
 		if((temp & ByteData)==0)
		{		
      		DIN=0;
		}	
 		else
		{
			 DIN=1;
     	}
		SCLOCK=0;
		Delay(10);
	   	SCLOCK=1;
		Delay(10);
 		temp=temp>>1;
	}
	CS=1;
}


void ReadFromReg(unsigned char nByte) // nByte is the number of bytes which need to be read
{
	int i,j;
   	unsigned char temp;
   	DIN=1;
 	CS=0;
    temp=0;
	DOUT=1;

	for(i=0; i<nByte; i++)
	{
		for(j=0; j<8; j++)
	    {
	     	SCLOCK=0;
	     	if(DOUT==0)
	     	{
				temp=temp<<1;
		 	}else
		 	{
				temp=temp<<1;
		 		temp=temp+0x01;
			}
			Delay(10);
	        SCLOCK=1;
			Delay(10);
		  }
		  DataRead[i]=temp;
		  temp=0;
	}
    CS=1;
}