Converting 12 bit value to 16 bit value TMS570

Hi

I work on a TMS570LS31USB kit and I want to send CAN data to the computer

I already made CANcommunication example which is in the halcogen>help>example file and it Works.But at this program which I write below when I want to send ADC data it gives error about the value.How can I convert the value which CAN communication want.

CAN communication gives maximum 8 bit but my ADC value is 12 bit.How can I convert it?

Thanks 

 double x;
  double y;
  adcData_t adc_data; //ADC Data Structure
  adcData_t *adc_data_ptr = &adc_data; //ADC Data Pointer
  unsigned int NumberOfChars, value; //Declare variables
  adcInit(); //Initializes the ADC module
  hetInit();
  canInit();
  while(1) // Loop to acquire and send ADC sample data via the SCI (UART)
  {
  adcStartConversion(adcREG1, 1U); //Start ADC conversion
  while(!adcIsConversionComplete(adcREG1, 1U)); //Wait for ADC conversion
  adcGetData(adcREG1, 1U, adc_data_ptr); //Store conversion into ADC pointer
  value = (unsigned int)adc_data_ptr->value;
  NumberOfChars = ltoa(value,(char *)command);
  x=value;//* ADC değeri ata *//

  canTransmit(canREG1, canMESSAGE_BOX1, x);
 

   if(x<4096)
  {
  y=100-(100*x/4096);

  pwmSetDuty(hetRAM1, pwm0, y);
  }
  else
  {
   pwmSetDuty(hetRAM1, pwm0, 0);
  }