Interfacing AD7714YN to programmable XBee900HP

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#include <xbee_config.h>
#include <types.h>
 
#define BUFLEN_C    1
#define BUFLEN_D    3
 
uint8_t txbuf; //transit buffer
uint8_t rxbuf[BUFLEN_D]; //receive buffer
uint8_t dummybuf[BUFLEN_D]; //Buffer with dummy values
bool_t Flag = 0; //Real time clock flag: will be changed to real time later
 
void ADC_SPI(void);
void delay(int num);
 
void delay(int num)
{
    int j;
    int k;
    for(j=0;j<=num;j++){
     while(k<256){
         k++;
     }
    k=0;    
    }
}
 
void ADC_SPI(void)
{
    uint32_t value = 0;
    int i;
    printf("\nCommence Setup");
    dummybuf[0] = 0xFF;
    dummybuf[1] = 0xFF;
    dummybuf[2] = 0xFF;
    rxbuf[0] = 0xFF;
    rxbuf[1] = 0xFF;
    rxbuf[2] = 0xFF;
    txbuf = (uint8_t)32; //0x20 set comm reg to write to high filter reg
    (void)spi_transfer(0,txbuf,NULL,BUFLEN_C);
    delay(100);
    txbuf = (uint8_t)64; //0x40 set high fil reg so 24bits and no filter
    (void)spi_transfer(0,txbuf,NULL,BUFLEN_C);
    delay(100);
    txbuf = (uint8_t)48; //0x30 set comm reg to write to low filter reg
    (void)spi_transfer(0,txbuf,NULL,BUFLEN_C);
    delay(100);
    txbuf = (uint8_t)0; //0x00 set low fil reg so there is no filter
    (void)spi_transfer(0,txbuf,NULL,BUFLEN_C);
    delay(100);
    txbuf = (uint8_t)16; //0x10 set comm reg to write to mode reg
    (void)spi_transfer(0,txbuf,NULL,BUFLEN_C);
    delay(100);
    txbuf = (uint8_t)0; //0x00 set mode reg for normal mode no gain
    (void)spi_transfer(0,txbuf,NULL,BUFLEN_C);
    delay(100);
    printf("\nFinish Setup\nWaiting for DRDY to go LOW...");
    for(;;){
    if ((gpio_get(XPIN_7))==0){    
     printf("\nDRDY is LOW!");
     txbuf= (uint8_t)88; //0x58 set comm reg to read from data reg and at Ain 1/6
     (void)spi_transfer(0,txbuf,NULL,BUFLEN_C);    
     delay(100);
     (void)spi_transfer(0,dummybuf,rxbuf, BUFLEN_D); //read
     delay(100);
     printf("\n");
     for (i = 0; i < BUFLEN_D; i++) {
         printf("%d", rxbuf[i]);
         
     }
     return;    
    }
    }
}
 
#if defined(RTC_ENABLE_PERIODIC_TASK)
void rtc_periodic_task(void)
{
   Flag = 1;
}
#endif
 
void main(void)
{
    int count = 1;
    sys_hw_init();
    sys_xbee_init();
    sys_app_banner();
    
    printf("\nStarting");    
    for (;;) {
     if(Flag ==1 ){
         printf("\nADC Selected %d times",count);
         count++;
         ADC_SPI();
         printf("\nDone");
         Flag = 0;
     }    
     delay_ticks(HZ);
     sys_watchdog_reset();
     sys_xbee_tick();                
    }        
}