 Thu Feb 22 10:37:03 2024, Stefan Ritt, Simulation of FPGA
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The Cypress has its own firmware, contained in the distribution under firmware/CY7C68013A/drs_eval.c. There you can see how the data is fetched. I kind
of forgot how exactly it worked, since I wrote that code back in 2011. But most if the Cypress code is just the configuration of the USB, the communication
with the FPGA is kind of straight forward in the Cypress implementation. But you have to read the manual of that chip to understand it. |
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Mon Jan 6 12:52:23 2025, Stefan Ritt, Problem with C++ script to use DRS4 evaluation board. Not taking data.
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1. Transparent mode is not needed for the hardware trigger, no idea why the code is there. You can probably remove it.
2. EnableTCal is only for the sake of having some waveforms at the input. Indeed you have to disable it to sample real signals.
3. EnableTrigger() is there to enable the hardware trigger. The flag2 is ther for historical reasons (used in older versions of the board). |
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Wed Mar 26 08:42:08 2025, Stefan Ritt, drs_exam.cpp not compile
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You have to link against the DRS.cpp library, plus usblib, plus ... Note there is both a Makefile and a CMakeLists.txt for it. Google how to use "make"
or "cmake".
Stefan |
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Fri May 9 08:17:50 2025, Stefan Ritt, Handling of Write Shift Register and Write Config Register
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This is correct. Setting A0-A3 to 0b1101 multiplexes the Shift Write Register to SROUT, so you will either a "0" or a "1" depending
on which of the two channels was written last.
Your segmented capture does unfortunately not work. Due to a bug in the silicon, the first (e.g. even) written channel gets half overwritten |
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Fri May 9 08:26:17 2025, Stefan Ritt, Clarification of full channel readout
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The full readout mode is not really recommended since you have to pull out the stop position separately. Just do the ROI readout using the RSRLOAD signal,
and then do 1024 samples, which also gives you the full waveform, but also the stop position in a single readout cyclce. The "full readout mode"
is more there for "historical reasons", but nobody really uses it any more. |
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Tue May 13 08:51:34 2025, Stefan Ritt, Handling of Write Shift Register and Write Config Register
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Yes this is correct. Anyhow, even if it would be working, you would not be happy with it. After having designed ~10 boards with the DRS4 chip, I learned
the hard way that any digital activity on the board during the sampling phase is strictly forbidden. You see crosstalk up to 100's of mV in some cases
(with a preamplifier on the board, 10-20mV without preamp). So rule #1 is to keep the board as "quite" as possible when sampling the input. If |
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Wed Feb 29 06:46:47 2012, Sonal, DRS4- analog pulse counting
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Stefan Ritt wrote:
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 Mon Apr 16 21:21:29 2018, Sobimpe Eniola, DRS4 read_binary.cpp
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Hello everyone,
The new read_binary.cpp code
I will be very glad if anyone can help with the old version of read_binary.cpp code. The latest version I saw online was updated on June |
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Wed Oct 15 10:14:32 2014, Simon Weingarten, Clock settings in daisy chain DAQ
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Hi,
I'm currently working on a little DAQ system with four DRS evaluation boards. Do i need to apply any specific settings when using the clock in/out
connectors for synchronization? I do not see anything like that in the drs_exam_multi example. |
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Wed Oct 15 11:34:43 2014, Simon Weingarten, Clock settings in daisy chain DAQ
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Stefan Ritt wrote:
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Fri Apr 17 10:07:38 2015, Simon Weingarten, Clock settings in daisy chain DAQ
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Hi Stefan,
do you know how these numbers (400ps and 60ps) scale with the sampling rate? The manual says they are for 5GS/s, do they change with slower sampling?
Thanks and best regards, |
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Fri Oct 28 15:02:18 2016, Simon Mendisch, Problems with DRS command line
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[quote="Stefan Ritt"]
You are the first one describing this problem (out of ~200 people), so I guess the problem must be on your side. Have you made sure to start the DRS oscilloscope
and the Command Line Interface not at the same time? Only one program can access the board at a given time. Have you tried disconnecting and re-connecting |
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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 |
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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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Wed Jun 26 15:17:51 2019, Si Xie, Running drs_example.cpp
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Hi Rodrigo, I'm wondering how you solved your original triggering problem. We are also having trouble with collecting data continously using the
example. Thanks.
Rodrigo |
Wed Oct 21 15:03:13 2020, Seiya Nozaki, Timing diagram of SROUT/SRIN signal to write/read a write shift register 
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Dear Stefan,
I have questions about the timing diagram of SROUT/SRIN signal to write/read a write shift register. |
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Tue Oct 27 15:02:09 2020, Seiya Nozaki, Timing diagram of SROUT/SRIN signal to write/read a write shift register
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Dear Stefan,
Thank you for your reply. |
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Wed Oct 28 04:32:19 2020, Seiya Nozaki, Timing diagram of SROUT/SRIN signal to write/read a write shift register
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Dear Stefan,
OK, it's good to hear! Thank you! |
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Mon Oct 17 16:29:37 2022, Sebastian Infante, DRS4 installation via tar in ubuntu not working
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Hello i cant install any the last versions that i downloaded from the dropbox, i can untar the file called drs-5.0.6 and when i type "make"
while inside the extracted folder that starts working properly till a point and i get an error, its worth mention that i installed wxWidgets and could
make a simple hello world that worked properly in wxWidgets. |
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Tue May 8 23:58:35 2018, Sean Quinn, Manual Rev5.1 Figure 1, optional components
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Dear All,
I'm troubleshooting a board which uses the DRS4 and adopts an analog front end very similar to the evaluation board. As a result, we rely |