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Entry  Tue Apr 28 11:44:07 2009, Stefan Ritt, Simple example application to read a DRS evaluation board drs_exam.cpp
    Reply  Wed Apr 29 07:57:33 2009, Stefan Ritt, Simple example application to read a DRS evaluation board DRS.cppDRS.h
    Reply  Mon Apr 5 17:57:41 2010, Heejong Kim, Simple example application to read a DRS evaluation board 
       Reply  Tue Apr 13 14:15:16 2010, Stefan Ritt, Simple example application to read a DRS evaluation board 
Message ID: 7     Entry time: Tue Apr 28 11:44:07 2009     Reply to this: 8   61
Author: Stefan Ritt 
Subject: Simple example application to read a DRS evaluation board 

Several people asked for s simple application to guide them in writing their own application to read out a DRS board. Such an application has been added in software revions 2.1.1 and is attached to this message. This example program drs_exam.cpp written in C++ does the following necessary steps to access a DRS board:

  • Crate a "DRS" object and scan all USB devices
  • Display found DRS boards
  • Initialize the first found board and set the sampling frequency to 5 GSPS
  • Enable internal trigger on channel #1 with 250 mV threshold
  • Start acquisition and wait for a trigger
  • Read two waveforms (both time and amplitude)
  • Repeat this 10 times

I know that we are still missing a good documentation for the DRS API, but I have not yet found the time to do that. I hope the example program is enough for most people to start writing own programs. For Windows users (MS Visual C++ 8.0) there is a drs.sln project file, and for linux users there is a Makefile which can be used to compile this example program.


Attachment 1: drs_exam.cpp  2 kB  | Hide | Hide all

  Name:         drs_exam.cpp
  Created by:   Stefan Ritt

  Contents:     Simple example application to read out a DRS4
                evaluation board

  $Id: drs_exam.cpp 13344 2009-04-28 07:34:45Z ritt@PSI.CH $


#include <math.h>

#ifdef _MSC_VER

#include <windows.h>

#elif defined(OS_LINUX)

#define O_BINARY 0

#include <unistd.h>
#include <ctype.h>
#include <sys/ioctl.h>
#include <errno.h>

#define DIR_SEPARATOR '/'


#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "strlcpy.h"
#include "DRS.h"


int main()
   int i, j, nBoards;
   DRS *drs;
   DRSBoard *b;
   float time_array[1024];
   float wave_array[8][1024];

   /* do initial scan */
   drs = new DRS();

   /* show any found board(s) */
   for (i=0 ; i<drs->GetNumberOfBoards() ; i++) {
      b = drs->GetBoard(i);
      printf("Found DRS4 evaluation board, serial #%d, firmware revision %d\n", 
         b->GetBoardSerialNumber(), b->GetFirmwareVersion());

   /* exit if no board found */
   nBoards = drs->GetNumberOfBoards();
   if (nBoards == 0) {
      printf("No DRS4 evaluation board found\n");
      return 0;

   /* continue working with first board only */
   b = drs->GetBoard(0);

   /* initialize board */

   /* set sampling frequency */

   /* enable transparent mode needed for analog trigger */

   /* use following line to disable hardware trigger */
   //b->EnableTrigger(0, 0);

   /* use following line to enable external hardware trigger (Lemo) */
   //b->EnableTrigger(1, 0);

   /* use following lines to enable hardware trigger on CH1 at 250 mV positive edge */
   b->EnableTrigger(0, 1);              // lemo off, analog trigger on
   b->SetTriggerSource(0);              // use CH1 as source
   b->SetTriggerLevel(0.25, false, 0);  // 0.25 V, positive edge, zero delay

   /* repeat ten times */
   for (j=0 ; j<10 ; j++) {

      /* start board (activate domino wave) */

      /* wait for trigger */
      printf("Waiting for trigger...");
      while (b->IsBusy());

      /* read all waveforms */
      b->TransferWaves(0, 8);

      /* read time (X) array in ns */
      b->GetTime(0, time_array);

      /* decode waveform (Y) array first channel in mV */
      b->GetWave(0, 0, wave_array[0]);

      /* decode waveform (Y) array second channel in mV*/
      b->GetWave(0, 1, wave_array[1]);

      /* process waveform: add here some code to display or save waveform X=time[i], Y=wave_array[n][i] */

      /* print some progress indication */
      printf("\rEvent #%d read successfully\n", j);
   /* delete DRS object -> close USB connection */
   delete drs;
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