Interfacing 18F4420 with AD7303 using SPI.

[Cheng]

Hi all, I'm trying to program PIC18F4420 using the SPI module to output an 8-bit information to AD7303, where it'll convert the binary data to relevant voltage. However, I just can't seem to get it to work with the code below. Any help would be most appreciated? =)

#include <p18f4420.h>
#include <delays.h>

unsigned char A;

void SPI(unsigned char);
unsigned char Variable;

void main(void)
{
	//SSP configuration
	TRISCbits.TRISC5=0;
	TRISCbits.TRISC3=0;
	TRISCbits.TRISC6=0;
	
	PORTCbits.RC5=0;
	PORTCbits.RC3=0;
	PORTCbits.RC6=1;

	SSPSTATbits.CKE = 1;
	SSPCON1 = 0x22;
	
	PORTCbits.RC4=0;

	SPI(0x00);

	
for(;;)	
{
	PORTCbits.RC6 = 0; //set at logic '0'
	SPI(0b00000001);
	SPI(0xAD);
	PORTCbits.RC6 = 1;
	PORTCbits.RC6 = 0; //set at logic '0'
	SPI(0b00110001);
	SPI(0xAD);
	PORTCbits.RC6 = 1;
}

		
}

void SPI(unsigned char Data)
{
	SSPBUF = Data;
	while(SSPSTATbits.BF==0);
	Data=SSPBUF;
	
}