Interfacing AD7714YN to programmable XBee900HP

[faizanb]

we are trying to interface a programmable XBEE to the ADC, AD7714YN, but we are getting the same variables no matter what voltage we give into the ADC.

Din is connected to MOSI of XBEE

Dout is connected to MISO of XBEE

We are using an input voltage from the XBEE connected to the USB (~3.3Volts)

We connected Dready of ADC to GPIO of XBEE

We have a terminal program setup on XCTU.

We are programming on code warrior.

The code we are using is:

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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();                
    }        
}

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