//send data
    switch(bytes)
    {
        case 3:
            _spi.write(((value >> 16) & 255));
        case 2:
            _spi.write(((value >> 8) & 255));
        case 1:
            _spi.write((value & 255));
            break;
        default:
            break;
    }

/************************************************************************************************************************/
//function to initiate the conversion of a sample
/************************************************************************************************************************/
int AD7730::startConversion(bool wait){
    
    //set the mode to do a single conversion
    //0101000100000000 (0x5000)  Single Conversion, unipolar, short data, low reference, 0-10mv, channel 0
    int mode = 0x5100;
 
    writeRegistry(MODE_REG, mode);
    
    if(wait){
        //wait for conversion to complete
         
        wait_us(1); //give time for ready to go high*/
    
        int time = 0;
        while(_readyDig && time < 2000000){
            time += 2;
            wait_us(2);
        }//wait for ready pin to go low.*/
        
        if(time >= 2000000){
            //printf("Convert Timeout\r\n");
            _exeError = 56;
            return 1;
        }
    }
    
    return 0;
}

#include "mbed.h"
 
SPI spi(p5, p6, p7); // mosi, miso, sclk
DigitalOut cs(p8);
 
int main() {
    // Chip must be deselected
    cs = 1;
 
    // Setup the spi for 8 bit data, high steady state clock,
    // second edge capture, with a 1MHz clock rate
    spi.format(8,3);
    spi.frequency(1000000);
 
    // Select the device by seting chip select low
    cs = 0;
 
    // Send 0x8f, the command to read the WHOAMI register
    spi.write(0x8F);
 
    // Send a dummy byte to receive the contents of the WHOAMI register
    int whoami = spi.write(0x00);
    printf("WHOAMI register = 0x%X\n", whoami);
 
    // Deselect the device
    cs = 1;
}