public override string execute(Blackfin bf, string[] args)
 {
     try
     {
         if (!bf.SetCountLogPeriod(int.Parse(args[0])))
         {
             return(null);
         }
     }
     catch (FormatException)
     {
         throw new CommandArgumentException("Invalid interval value");
     }
     return("Set count log interval");
 }