 Tue Jun 25 23:04:29 2019, Si Xie, drs_exam is always reading out a sin wave
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We are using the drs_exam.cpp to read out waveforms, but it seems to be outputting only sin waves on all channels - as if it was reading out the simulated
waveform from the oscilloscope program if we run it without the board plugged in. Does anyone know what is causing this?
We are taking data with a pulser plugged into channel 1, which produces a single pulse with width of 8ns, and nothing plugged into channel |
 Wed Jun 26 13:08:42 2019, Stefan Ritt, drs_exam is always reading out a sin wave
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Sure, that’s correct. The example program turns on the internal sine wave generator in case people don’t have a real signal. That’s
why it’s called „example“. Find the code which turns on the generator and change it. You will also have to change the trigger settings
depending on your actual signal. |
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Wed Jun 26 15:10:09 2019, Si Xie, drs_exam is always reading out a sin wave
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I see. Where is the code that we can use to turn off the generator? I thought the example is taking data with CH1 as the trigger.
For our board, which is BoardType == 9, it is running these lines:
b->EnableTrigger(1, 0); // enable hardware trigger |
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Mon Jul 8 14:29:12 2019, Stefan Ritt, drs_exam is always reading out a sin wave
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Actually in the original drs_exam.cpp the sine wave oscillator is turned off with this command
/* use following line to turn on the internal 100 MHz clock connected to all channels */
//b->EnableTcal(1); |
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Mon Apr 10 08:50:11 2017, Giovanni Bruni, drs4 registers behaviour
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Hej everyone!
I have some questions regarding what happens to some DRS registers in some scenarios:
1. How are the registers affected by a RESET? According to the data sheet all the CONFIG REGISTER bits are initilialized to 1. But what about the |
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Mon Apr 10 10:50:57 2017, Stefan Ritt, drs4 registers behaviour
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Using the RESET line to reset registers is not a good idea since it can have some bad side-effects. The READ SHIFT register is NOT affected by RESET,
so you have to inititialize these registers differently. To set a "1"-value at a defined position, you have to follow figure 11 in the data sheet.
Once you executed that, your "1" is always at the same posiiton (namely cell #0), so after 1024 clock cycles you arrive at the same state, and |
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Mon Apr 10 13:41:41 2017, Giovanni Bruni, drs4 registers behaviour
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Hej Stefan! Thank you for your answer!
Just to be sure to have understood properly:
1. Using the RESET line should be avoided. And in any case, the CONFIG register and the WRITE SHIFT register need to be initialized "by hand" |
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Mon Apr 10 14:05:17 2017, Stefan Ritt, drs4 registers behaviour
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1. WRITE SHIFT register and CONFIG registers are initialized to "1" on power up, but if you want to change that, use A0-A3 etc. as you indicated.
2. If you address the READ SHIFT register by applyin "1011" to A0-A3, the input of the register is connected to SRIN. So in fig. 11,
you apply 1023x"0" plus 1x"1", which effectively clears the register and keeps one "1" at the last position, so on the next |
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Tue Apr 11 09:07:33 2017, Giovanni Bruni, drs4 registers behaviour
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Thank you Stefan for replying!
I have still the RESET issue in mind: how would you suggest to reset properly the DRS? Is there a particular procedure to follow instead of just
sending a negative pulse to the RESET pin? Is it preferable to turn the DRS off and then restart? |
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Tue Apr 11 09:41:44 2017, Stefan Ritt, drs4 registers behaviour
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What I do is the following: Have the RESET input unconnected. When you power up, this makes an internal reset during the power up, and that's all
you need. Then configure your registers using the sequences described in the manual. Then do not touch the RESET any more.
Stefan |
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Wed Jan 20 12:14:49 2021, Taegyu Lee, drs4 persistence
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Dear all,
I have a question about the function that drs4 can perform.
Is there any function in drs4 that is analogous to that of "persistence display" in oscilloscope?? (accumulating pulses) |
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Wed Jan 20 17:37:51 2021, Stefan Ritt, drs4 persistence
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The chip itself can only sample a single waveform, that must be done in the attached software. The current DRSOscilloscope software coming with the evaluation
board has not yet implemented that, but if you write your own software you can do so.
Taegyu |
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Fri Feb 13 10:12:16 2015, Andrzej Grzeszczuk, drs4 and root
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Hello,
I compiled base file for drs system (DRS.cpp) to root framework (root.cern.ch) as dynamic library DRS.so. It can be used for building many
kind of applications under the root system. I applied it for older version of root 5.28 and for latest version 6.02 too. |
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Thu Dec 17 09:29:43 2020, Alex Myczko, drs sources on github?
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Are there plans to add the drs software to github? (asking because I have users @ethz.ch that want to use it on debian,
thus I'm creating official debian packages of it, if license allows so, but talking to upstream (the developers) would be
much easier on github (or irc) than on this "DRS4 Discussion Forum".
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Thu Dec 17 11:31:34 2020, Stefan Ritt, drs sources on github?
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Not github, but bitbucket: https://bitbucket.org/ritt/drs4eb/src/master/
But development kind of stalled, so there will be updates only in case of severe bugs, which are kind of gone after 10 years now.
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Thu Jun 18 17:33:05 2015, Gregor Kramberger, drs 5.03 and windows 8.1
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I have problems with driver installation on windows 8.1 (software version 5.03). I have sen that that has been an issue before (driver signing)
and I would like to know if this has been solved. We run several DRS4 evaluation boards on different PCs all running Win7 without any problems.
Therefore we are almost confident that it is related to Win 8.1. Thanks. |
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Fri Jun 19 12:32:10 2015, Gregor Kramberger, drs 5.03 and windows 8.1
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Gregor Kramberger wrote:
I have problems with driver |
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Sun Oct 19 14:36:54 2014, Chris Tully, coverting the xml file format into binary
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Hi,
Is there a straightforward way to convert the xml file format into the binary format? I have some runs taken mistakenly with
xml. |
Wed Mar 14 09:13:39 2018, chen wenjun, confusion about the description in drs.cpp 
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Hi,Stefan:
recently,whtn I study the drs.cpp code ,I found that the buffer[1] is char but the addr and the base_addr are all unsigned int,isn't
there any problem that the addr may be cut off to 8 bits? Also ,I found that the data fpga recieved from the usb is 16 bits,so how can fpga get the true |
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Fri Mar 16 14:00:06 2018, Stefan Ritt, confusion about the description in drs.cpp
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The FPGA is very small, so it only has an address space of 256 bytes. Look at the definition in DRS.cpp
#define USB_CTRL_OFFSET
0x00 /* all registers 32 bit */ |