File content as of revision 0:93964709b7a6:

/*
 * The program try to test the phenomenon as mentioned in
 * http://mbed.org/users/chris/notebook/Getting-best-ADC-performance/
 *
 *  a) Unused ADC pins are either tied to ground, or declared as DigitalOut
 *  b) Quality of signal source, including low noise design techniques such 
 *     as filtering. 
 *  c) Reduce debugging communication via USB
 */
 
#include "mbed.h"

#define   SSIZE 100

AnalogIn  ain(p20);
BusOut    unused(p15,p16,p17,p18,p19);  // Make unused analog pin to DigitalOut

float     value[SSIZE];
float     max;
float     min;
double    itg;

void printNow()
{
  time_t    s;
  char      buffer[20];

  s = time(NULL);
  strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", localtime(&s));
  printf("%s\n", buffer);
}

void printSecNow()
{
  time_t    s;
  s = time(NULL);
  printf("%d\n", s);
}

int main() 
{
  set_time(1323180910);

  while (1)
  {
    //printNow();
    printf("\n-----------------\n");
    printSecNow();
    max = itg = 0.0;
    min = 3.3;
    // Sample before printing to avoid debug communucation
    for (int i=0; i<SSIZE; i++)
    {
      value[i] = ain;
      if (value[i] > max) max = value[i];
      if (value[i] < min) min = value[i];
      itg += value[i];
    }
    printSecNow();
    
    // Now print out
    for (int i=0; i<SSIZE; i++)
    {
      printf("%0.3f ", value[i]*3.3);  
    }
    printf("\n");
    printf("max=%0.3f, min=%0.3f, avg=%0.3f\n", 
           max*3.3, min*3.3, 3.3*itg/SSIZE);
    wait(10);
  }
}