ID |
Date |
Author |
Subject |
179
|
Wed Aug 29 16:57:49 2012 |
Zach Miller | DRS-4.0.0 DOScreen.cpp |
Stefan Ritt wrote: |
Zach Miller wrote: |
Stefan Ritt wrote: |
Zach Miller wrote: |
Hi,
I found an old thread regarding a fix for DOScreen.cpp for DRS-3.1.0, that fixes an "ambiguous overload problem." Currently when I attempt to build the drs-4.0.0, I get this similar error:
src/DOScreen.cpp:332:39: error: call of overloaded ‘Append(int)’ is ambiguous
This section of code is different than what the previous thread was correcting, and though I attempted to apply the logic of the old thread, I haven't fixed this yet.
The following is the code for that section:
-----
329 for (int i=0 ; i<5 ; i++)
330 if (tc & (1<<(i+8))) {
331 if (i < 4)
332 wxst1.Append(wxT('1'+i));
333 else
334 wxst1.Append(wxT('E'));
335 wxst1.Append(wxT('&'));
336 }
337 if (wxst1.Length() > 0)
338 wxst1 = wxst1.Left(wxst1.Length()-1);
339 wxst1.Append(wxT(')'));
------
I've attempted a few fixes, but unfortunately, my understanding of the code is not great, and I haven't managed to fix this yet. Any help would be appreciated.
Thanks,
Zach Miller
|
Just put (char) in front of wxT(...), like
if (tc > 0) {
wxString wxst1, wxst2;
wxst1.Append((char)wxT('('));
for (int i=0 ; i<5 ; i++)
if (tc & (1<<i)) {
if (i < 4)
wxst1.Append((char) (wxT('1'+i)));
else
wxst1.Append((char) wxT('E'));
wxst1.Append((char) wxT('|'));
}
for (int i=0 ; i<5 ; i++)
if (tc & (1<<(i+8))) {
if (i < 4)
wxst1.Append((char) (wxT('1'+i)));
else
wxst1.Append((char) wxT('E'));
wxst1.Append((char) wxT('&'));
}
if (wxst1.Length() > 0)
wxst1 = wxst1.Left(wxst1.Length()-1);
wxst1.Append((char) wxT(')'));
|
Hi Stefan,
Thanks for the response. I have tried that and it fixes all the lines except the ones that have:
wxst1.Append((char) (wxT('1'+i)));
Those lines still don't compile for me. I've also tried: wxst1.Append((char) (wxT('1'+(char)i))); and wxst1.Append((char) (wxT((char)'1'+i))); as well as a few other combinations of (char) and Append.
I get the same error of: "Call of overloaded "Append(int)" is ambiguous."
Any other help would be greatly appreciated. Thanks!
-Zach
|
wxst1.Append((char) (wxT((char)('1'+i)))); maybe ???
|
Aha!
wxst1.Append((char) (wxT('1'+i)));
That one actually works as you initially thought, but you my editor was being picky of (char)wxt... instead of (char) (wxt....). For some reason, it has to have the extra set of parentheses around wxt(). Thank You! |
178
|
Wed Aug 29 16:45:36 2012 |
Stefan Ritt | DRS-4.0.0 DOScreen.cpp |
Zach Miller wrote: |
Stefan Ritt wrote: |
Zach Miller wrote: |
Hi,
I found an old thread regarding a fix for DOScreen.cpp for DRS-3.1.0, that fixes an "ambiguous overload problem." Currently when I attempt to build the drs-4.0.0, I get this similar error:
src/DOScreen.cpp:332:39: error: call of overloaded ‘Append(int)’ is ambiguous
This section of code is different than what the previous thread was correcting, and though I attempted to apply the logic of the old thread, I haven't fixed this yet.
The following is the code for that section:
-----
329 for (int i=0 ; i<5 ; i++)
330 if (tc & (1<<(i+8))) {
331 if (i < 4)
332 wxst1.Append(wxT('1'+i));
333 else
334 wxst1.Append(wxT('E'));
335 wxst1.Append(wxT('&'));
336 }
337 if (wxst1.Length() > 0)
338 wxst1 = wxst1.Left(wxst1.Length()-1);
339 wxst1.Append(wxT(')'));
------
I've attempted a few fixes, but unfortunately, my understanding of the code is not great, and I haven't managed to fix this yet. Any help would be appreciated.
Thanks,
Zach Miller
|
Just put (char) in front of wxT(...), like
if (tc > 0) {
wxString wxst1, wxst2;
wxst1.Append((char)wxT('('));
for (int i=0 ; i<5 ; i++)
if (tc & (1<<i)) {
if (i < 4)
wxst1.Append((char) (wxT('1'+i)));
else
wxst1.Append((char) wxT('E'));
wxst1.Append((char) wxT('|'));
}
for (int i=0 ; i<5 ; i++)
if (tc & (1<<(i+8))) {
if (i < 4)
wxst1.Append((char) (wxT('1'+i)));
else
wxst1.Append((char) wxT('E'));
wxst1.Append((char) wxT('&'));
}
if (wxst1.Length() > 0)
wxst1 = wxst1.Left(wxst1.Length()-1);
wxst1.Append((char) wxT(')'));
|
Hi Stefan,
Thanks for the response. I have tried that and it fixes all the lines except the ones that have:
wxst1.Append((char) (wxT('1'+i)));
Those lines still don't compile for me. I've also tried: wxst1.Append((char) (wxT('1'+(char)i))); and wxst1.Append((char) (wxT((char)'1'+i))); as well as a few other combinations of (char) and Append.
I get the same error of: "Call of overloaded "Append(int)" is ambiguous."
Any other help would be greatly appreciated. Thanks!
-Zach
|
wxst1.Append((char) (wxT((char)('1'+i)))); maybe ??? |
177
|
Wed Aug 29 16:42:42 2012 |
Zach Miller | DRS-4.0.0 DOScreen.cpp |
Stefan Ritt wrote: |
Zach Miller wrote: |
Hi,
I found an old thread regarding a fix for DOScreen.cpp for DRS-3.1.0, that fixes an "ambiguous overload problem." Currently when I attempt to build the drs-4.0.0, I get this similar error:
src/DOScreen.cpp:332:39: error: call of overloaded ‘Append(int)’ is ambiguous
This section of code is different than what the previous thread was correcting, and though I attempted to apply the logic of the old thread, I haven't fixed this yet.
The following is the code for that section:
-----
329 for (int i=0 ; i<5 ; i++)
330 if (tc & (1<<(i+8))) {
331 if (i < 4)
332 wxst1.Append(wxT('1'+i));
333 else
334 wxst1.Append(wxT('E'));
335 wxst1.Append(wxT('&'));
336 }
337 if (wxst1.Length() > 0)
338 wxst1 = wxst1.Left(wxst1.Length()-1);
339 wxst1.Append(wxT(')'));
------
I've attempted a few fixes, but unfortunately, my understanding of the code is not great, and I haven't managed to fix this yet. Any help would be appreciated.
Thanks,
Zach Miller
|
Just put (char) in front of wxT(...), like
if (tc > 0) {
wxString wxst1, wxst2;
wxst1.Append((char)wxT('('));
for (int i=0 ; i<5 ; i++)
if (tc & (1<<i)) {
if (i < 4)
wxst1.Append((char) (wxT('1'+i)));
else
wxst1.Append((char) wxT('E'));
wxst1.Append((char) wxT('|'));
}
for (int i=0 ; i<5 ; i++)
if (tc & (1<<(i+8))) {
if (i < 4)
wxst1.Append((char) (wxT('1'+i)));
else
wxst1.Append((char) wxT('E'));
wxst1.Append((char) wxT('&'));
}
if (wxst1.Length() > 0)
wxst1 = wxst1.Left(wxst1.Length()-1);
wxst1.Append((char) wxT(')'));
|
Hi Stefan,
Thanks for the response. I have tried that and it fixes all the lines except the ones that have:
wxst1.Append((char) (wxT('1'+i)));
Those lines still don't compile for me. I've also tried: wxst1.Append((char) (wxT('1'+(char)i))); and wxst1.Append((char) (wxT((char)'1'+i))); as well as a few other combinations of (char) and Append.
I get the same error of: "Call of overloaded "Append(int)" is ambiguous."
Any other help would be greatly appreciated. Thanks!
-Zach |
176
|
Wed Aug 29 10:52:44 2012 |
Stefan Ritt | DRS-4.0.0 DOScreen.cpp |
Zach Miller wrote: |
Hi,
I found an old thread regarding a fix for DOScreen.cpp for DRS-3.1.0, that fixes an "ambiguous overload problem." Currently when I attempt to build the drs-4.0.0, I get this similar error:
src/DOScreen.cpp:332:39: error: call of overloaded ‘Append(int)’ is ambiguous
This section of code is different than what the previous thread was correcting, and though I attempted to apply the logic of the old thread, I haven't fixed this yet.
The following is the code for that section:
-----
329 for (int i=0 ; i<5 ; i++)
330 if (tc & (1<<(i+8))) {
331 if (i < 4)
332 wxst1.Append(wxT('1'+i));
333 else
334 wxst1.Append(wxT('E'));
335 wxst1.Append(wxT('&'));
336 }
337 if (wxst1.Length() > 0)
338 wxst1 = wxst1.Left(wxst1.Length()-1);
339 wxst1.Append(wxT(')'));
------
I've attempted a few fixes, but unfortunately, my understanding of the code is not great, and I haven't managed to fix this yet. Any help would be appreciated.
Thanks,
Zach Miller
|
Just put (char) in front of wxT(...), like
if (tc > 0) {
wxString wxst1, wxst2;
wxst1.Append((char)wxT('('));
for (int i=0 ; i<5 ; i++)
if (tc & (1<<i)) {
if (i < 4)
wxst1.Append((char) (wxT('1'+i)));
else
wxst1.Append((char) wxT('E'));
wxst1.Append((char) wxT('|'));
}
for (int i=0 ; i<5 ; i++)
if (tc & (1<<(i+8))) {
if (i < 4)
wxst1.Append((char) (wxT('1'+i)));
else
wxst1.Append((char) wxT('E'));
wxst1.Append((char) wxT('&'));
}
if (wxst1.Length() > 0)
wxst1 = wxst1.Left(wxst1.Length()-1);
wxst1.Append((char) wxT(')'));
|
175
|
Tue Aug 28 17:52:45 2012 |
Zach Miller | DRS-4.0.0 DOScreen.cpp | Hi,
I found an old thread regarding a fix for DOScreen.cpp for DRS-3.1.0, that fixes an "ambiguous overload problem." Currently when I attempt to build the drs-4.0.0, I get this similar error:
src/DOScreen.cpp:332:39: error: call of overloaded ‘Append(int)’ is ambiguous
This section of code is different than what the previous thread was correcting, and though I attempted to apply the logic of the old thread, I haven't fixed this yet.
The following is the code for that section:
-----
329 for (int i=0 ; i<5 ; i++)
330 if (tc & (1<<(i+8))) {
331 if (i < 4)
332 wxst1.Append(wxT('1'+i));
333 else
334 wxst1.Append(wxT('E'));
335 wxst1.Append(wxT('&'));
336 }
337 if (wxst1.Length() > 0)
338 wxst1 = wxst1.Left(wxst1.Length()-1);
339 wxst1.Append(wxT(')'));
------
I've attempted a few fixes, but unfortunately, my understanding of the code is not great, and I haven't managed to fix this yet. Any help would be appreciated.
Thanks,
Zach Miller |
174
|
Mon Aug 6 02:44:00 2012 |
Stefan Ritt | Calculation of loop filter parameters (R,C1and C1) for 1 GHz |
Mayank S. Rajguru wrote: |
Hi,
we are planning to use the DRS4 in our board for 1 GHz sampling and digitization.
I have seen in the data sheet that "For the PLL to work, an external loop filter is required. This filter ensures quick locking and stable operation at the desired sampling frequency".
What formula do you use to calculate the values of R, C1 and C2?
Can we use the same given value for different frequencies?
Thanks,
Mayak
|
I never worked out an exact formula for the parameters. It also depends if you want a fast locking time, or a low phase jitter of the PLL. A good starting point are the values from the evaluation board:
R = 130 Ohm
C1 = 4.7 nF
C2 = 1 uF
They should work from 800 MHz to 5 GHz.
- Stefan |
173
|
Wed Aug 1 17:42:32 2012 |
Mayank S. Rajguru | Calculation of loop filter parameters (R,C1and C1) for 1 GHz | Hi,
we are planning to use the DRS4 in our board for 1 GHz sampling and digitization.
I have seen in the data sheet that "For the PLL to work, an external loop filter is required. This filter ensures quick locking and stable operation at the desired sampling frequency".
What formula do you use to calculate the values of R, C1 and C2?
Can we use the same given value for different frequencies?
Thanks,
Mayak |
172
|
Wed Jul 11 10:04:51 2012 |
Ivan Petrov | Problem compiling drs_exam.cpp on windows |
Stefan Ritt wrote: |
Ivan Petrov wrote: |
Hello again. I have not got evaluation board yet, but already faced some difficulties:) I'm trying to compile drs_exam.cpp on Windows 7 using dev-c++ with imagelib-2 and WxWindows 2.4.2 DevPaks installed, but nothing works. Compile log is attached. Honestly, I'm not very familiar with c++, so any suggestions will be helpful. Thank you.
|
I have no experience with dev-c++, so I cannot be of help here. The supported systems are Linux and Windows with MS Visual C++. But it looks like the problems are related to compiling wxWidgets, which actually you do NOT need for drs_exam.cpp. The wxWidgets library is only needed for the DRSOsc application. If you want to compile it anyhow, first learn how to compile standard WxWidgets applications from
http://www.wxwidgets.org/docs/tutorials/devcpp.htm
Best regards,
Stefan
|
Ok, this was my bad, I added some unnecessary files to project. Drs_exam compiles well with ms vc++. Thanks! |
171
|
Tue Jul 10 13:15:00 2012 |
Stefan Ritt | Problem compiling drs_exam.cpp on windows |
Ivan Petrov wrote: |
Hello again. I have not got evaluation board yet, but already faced some difficulties:) I'm trying to compile drs_exam.cpp on Windows 7 using dev-c++ with imagelib-2 and WxWindows 2.4.2 DevPaks installed, but nothing works. Compile log is attached. Honestly, I'm not very familiar with c++, so any suggestions will be helpful. Thank you.
|
I have no experience with dev-c++, so I cannot be of help here. The supported systems are Linux and Windows with MS Visual C++. But it looks like the problems are related to compiling wxWidgets, which actually you do NOT need for drs_exam.cpp. The wxWidgets library is only needed for the DRSOsc application. If you want to compile it anyhow, first learn how to compile standard WxWidgets applications from
http://www.wxwidgets.org/docs/tutorials/devcpp.htm
Best regards,
Stefan |
170
|
Mon Jul 9 14:14:48 2012 |
Ivan Petrov | Problem compiling drs_exam.cpp on windows | Hello again. I have not got evaluation board yet, but already faced some difficulties:) I'm trying to compile drs_exam.cpp on Windows 7 using dev-c++ with imagelib-2 and WxWindows 2.4.2 DevPaks installed, but nothing works. Compile log is attached. Honestly, I'm not very familiar with c++, so any suggestions will be helpful. Thank you. |
Attachment 1: compile_log.txt
|
Compiler: Default compiler
Building Makefile: "G:\devcpp\Makefile.win"
Executing make...
make.exe -f "G:\devcpp\Makefile.win" all
g++.exe -c AboutDialog.cpp -o AboutDialog.o -I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include" -I"C:/Dev-Cpp/include/c++/3.4.2/backward" -I"C:/Dev-Cpp/include/c++/3.4.2/mingw32" -I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include"
In file included from C:/Dev-Cpp/include/wx/wx.h:15,
from DRSOscInc.h:7,
from AboutDialog.cpp:7:
C:/Dev-Cpp/include/wx/defs.h:179: error: redeclaration of C++ built-in type `int'
In file included from C:/Dev-Cpp/include/wx/memory.h:20,
from C:/Dev-Cpp/include/wx/object.h:25,
from C:/Dev-Cpp/include/wx/wx.h:16,
from DRSOscInc.h:7,
from AboutDialog.cpp:7:
C:/Dev-Cpp/include/wx/string.h:160:4: #error "Please define string case-insensitive compare for your OS/compiler"
In file included from DRSOscInc.h:12,
from AboutDialog.cpp:7:
DRSOsc.h:38:26: wx/hyperlink.h: No such file or directory
In file included from DRSOscInc.h:12,
from AboutDialog.cpp:7:
DRSOsc.h:532: error: ISO C++ forbids declaration of `wxHyperlinkCtrl' with no type
DRSOsc.h:532: error: expected `;' before '*' token
make.exe: *** [AboutDialog.o] Error 1
Execution terminated
|
169
|
Mon Jun 25 14:21:13 2012 |
Stefan Ritt | triger for measuring time between pulses in channels |
Andrey Kuznetsov wrote: |
Stefan Ritt wrote: |
On the evaluation board, yes. This board is not optimized for high readout rate. If you do your own electronics, like GBit Ethernet, you could be much faster.
|
What is the readout rate via GBit Ethernet that you have achieved?
Where is the bottleneck in ethernet?
What is the proposed scheme by which the GBit Ethernet will be implemented, will the DRS4 Eval Board have to wait for the computer to respond before sending the data (wouldn't this make the readout much slower?), or will the DRS4 Eval Board keep sending the data to the computer?
|
With GBit Ethernet you get close to 100 MB/sec, which is the maximal line speed. The protocol to be implemented will achieve that rate. What one usually does is to send events in large blocks upon request from the PC. The trick is to do the request in a clever way, like using a high water mark on the receiving event buffer. So as long as the PC can digest the data quickly enough, the board just keeps sending, which means no overhead.
|
168
|
Sat Jun 23 00:29:52 2012 |
Andrey Kuznetsov | triger for measuring time between pulses in channels |
Stefan Ritt wrote: |
On the evaluation board, yes. This board is not optimized for high readout rate. If you do your own electronics, like GBit Ethernet, you could be much faster.
|
What is the readout rate via GBit Ethernet that you have achieved?
Where is the bottleneck in ethernet?
What is the proposed scheme by which the GBit Ethernet will be implemented, will the DRS4 Eval Board have to wait for the computer to respond before sending the data (wouldn't this make the readout much slower?), or will the DRS4 Eval Board keep sending the data to the computer? |
167
|
Wed Jun 20 14:44:38 2012 |
Stefan Ritt | triger for measuring time between pulses in channels |
Ivan Petrov wrote: |
Stefan Ritt wrote: |
Ivan Petrov wrote: |
Hello. I need to digitize pulses from two PMT. After pulse on first PMT I have to save all pulses from second PMT in range 200 ns (and starting pulse from the first, and time range between pulse from 1st PMT and pulses from 2nd PMT). Is it possible with DRS evaluation board?
|
If you run at 2 GSPS, you have a time window of 500 ns like on an oscilloscope. If you trigger on 1st PMT, you will get the traces of all 4 inputs for the next 500 ns. So I guess this is what you want.
|
Ok. And, If I understand correctly, the main bottleneck in data readout is USB. I.e., theoretically maximum readout rate is 500 Hz. Is it true?
|
On the evaluation board, yes. This board is not optimized for high readout rate. If you do your own electronics, like GBit Ethernet, you could be much faster. |
166
|
Wed Jun 20 14:36:01 2012 |
Ivan Petrov | triger for measuring time between pulses in channels |
Stefan Ritt wrote: |
Ivan Petrov wrote: |
Hello. I need to digitize pulses from two PMT. After pulse on first PMT I have to save all pulses from second PMT in range 200 ns (and starting pulse from the first, and time range between pulse from 1st PMT and pulses from 2nd PMT). Is it possible with DRS evaluation board?
|
If you run at 2 GSPS, you have a time window of 500 ns like on an oscilloscope. If you trigger on 1st PMT, you will get the traces of all 4 inputs for the next 500 ns. So I guess this is what you want.
|
Ok. And, If I understand correctly, the main bottleneck in data readout is USB. I.e., theoretically maximum readout rate is 500 Hz. Is it true? |
165
|
Wed Jun 20 12:45:05 2012 |
Stefan Ritt | triger for measuring time between pulses in channels |
Ivan Petrov wrote: |
Hello. I need to digitize pulses from two PMT. After pulse on first PMT I have to save all pulses from second PMT in range 200 ns (and starting pulse from the first, and time range between pulse from 1st PMT and pulses from 2nd PMT). Is it possible with DRS evaluation board?
|
If you run at 2 GSPS, you have a time window of 500 ns like on an oscilloscope. If you trigger on 1st PMT, you will get the traces of all 4 inputs for the next 500 ns. So I guess this is what you want. |
164
|
Wed Jun 20 10:40:21 2012 |
Ivan Petrov | triger for measuring time between pulses in channels |
Stefan Ritt wrote: |
Martin Petriska wrote: |
Stefan Ritt wrote: |
Martin Petriska wrote: |
I have two BaF2 detectors with PMT connected to Ch1 and Ch2. At this time Im using external triger module to start DRS4. My evalution board is version 3 so I have no possibility to trigger on two or more pulses occurence on different channels. But I have this idea, trigger with analog trigger on channel 1 (start detector) will start measurement on all channels. After that using FPGA inside EVM to look if some value in Ch2 is bigger as treshold value for example 0,5V and if yes then send data by USB to PC, if signal in Ch2 is lower then restart measurement and wait on triger in Ch1. This way I want to eliminate false data transfer throw USB. Is this possible to implement it into DRS4 evaluation board firmware ?
Thanks.
|
It is muuuuch easier to upgrade to a V4 board!
Modification of firmware is not so easy. You have to learn and understand VHDL. Then, you have to add additional registers for this thresholds, which requires modification of the C library as well. The data inside the evaluation boards is not yet calibrated (this is only done on the C library), so you have an uncertainty of 30-40mV in this data.
|
Ok, except this, I would have a question regarding to the new trigering posibility in V4 board. At this time, I am using Ztec ZT4612 which has some pattern triger posibility. Output from this card is used as an external trigger. Regarding this I have found a problem. Pulses from PMT have about 5-8 ns width. But I need to measure time diferences between pulses in range from 0-50ns. Problem is, that coincidence between pulses is working only on short pulse area (5-8ns) when they are overlapped. Additionaly the result histogram of time diferences is proportional to the pulse shapes. I solve this problem enabling 20MHz LPF filter in ZT4612, so the pulses are wider and overlaped on larger area. But, how it is with the V4 board? Will it trigger if I have for example one 5ns pulse on begiinning of CH1 and second pulse for example 50 ns later on Ch2 with the same probability when pulses are in the same time position?
|
No.
|
Hello. I need to digitize pulses from two PMT. After pulse on first PMT I have to save all pulses from second PMT in range 200 ns (and starting pulse from the first, and time range between pulse from 1st PMT and pulses from 2nd PMT). Is it possible with DRS evaluation board? |
163
|
Wed Apr 25 13:42:37 2012 |
Stefan Ritt | DRS4 Initialization |
Guillaume Blanchard wrote: |
Hello,
I am writing a VHDL code to drive a DRS4 chip.
In order to configure the DRS4 chip, I have to set the "Config Register" and the "Write Shift Register" then ... (I do not plan to use simultaneous WR and R so I guess the Write Config Reg. is not needed)
My question is :
When do we have to perform a "Read Shift Register Initialization" ?
Every time before a full read-out, or juste once after a DRS4 reset ?
Further more, is this initialization needed for the ROI mode ?
And at last do the level of the DENABLE and DWRITE signals matter for the "Read Shift Register Initialization" ?
(To sum up : what is the purpose of the Read Shift Register and how does it work ?)
Cordially,
G.Blanchard.
|
There are two readout modes "Full Readout Mode" and "ROI mode".
In the Full Readout Mode, the Read Shift Register has to be initialized before the first readout by applying the sequence shown in Figure 11 in the data sheet. This clears the full shift register and sets the first cell to "1". In principle in the following events one applies each time 1024 clocks. Since the shift register is circula, the single "1" rotates through the shift register and is at the same position after 1024 clocks. So in principle the register does not have to be re-initialized. To be hones I have never tried this myself, so I'm not completely sure if that works.
In the ROI mode, you initialize the Read Shift Register by a single RSRLOAD pulse as shown in Figure 15. Since the inverter chain stops at different positions in each event, this pulse has to be applied before each event. The SROUT bits will then tell you where the inverter chain has been stopped.
Most people I know of use the ROI mode, since the initialization is much simpler (just a single pulse).
Best regards,
Stefan |
162
|
Mon Apr 23 10:38:51 2012 |
Guillaume Blanchard | DRS4 Initialization | Hello,
I am writing a VHDL code to drive a DRS4 chip.
In order to configure the DRS4 chip, I have to set the "Config Register" and the "Write Shift Register" then ... (I do not plan to use simultaneous WR and R so I guess the Write Config Reg. is not needed)
My question is :
When do we have to perform a "Read Shift Register Initialization" ?
Every time before a full read-out, or juste once after a DRS4 reset ?
Further more, is this initialization needed for the ROI mode ?
And at last do the level of the DENABLE and DWRITE signals matter for the "Read Shift Register Initialization" ?
(To sum up : what is the purpose of the Read Shift Register and how does it work ?)
Cordially,
G.Blanchard. |
161
|
Wed Mar 21 09:39:33 2012 |
Stefan Ritt | triger for measuring time between pulses in channels |
Martin Petriska wrote: |
Stefan Ritt wrote: |
Martin Petriska wrote: |
I have two BaF2 detectors with PMT connected to Ch1 and Ch2. At this time Im using external triger module to start DRS4. My evalution board is version 3 so I have no possibility to trigger on two or more pulses occurence on different channels. But I have this idea, trigger with analog trigger on channel 1 (start detector) will start measurement on all channels. After that using FPGA inside EVM to look if some value in Ch2 is bigger as treshold value for example 0,5V and if yes then send data by USB to PC, if signal in Ch2 is lower then restart measurement and wait on triger in Ch1. This way I want to eliminate false data transfer throw USB. Is this possible to implement it into DRS4 evaluation board firmware ?
Thanks.
|
It is muuuuch easier to upgrade to a V4 board!
Modification of firmware is not so easy. You have to learn and understand VHDL. Then, you have to add additional registers for this thresholds, which requires modification of the C library as well. The data inside the evaluation boards is not yet calibrated (this is only done on the C library), so you have an uncertainty of 30-40mV in this data.
|
Ok, except this, I would have a question regarding to the new trigering posibility in V4 board. At this time, I am using Ztec ZT4612 which has some pattern triger posibility. Output from this card is used as an external trigger. Regarding this I have found a problem. Pulses from PMT have about 5-8 ns width. But I need to measure time diferences between pulses in range from 0-50ns. Problem is, that coincidence between pulses is working only on short pulse area (5-8ns) when they are overlapped. Additionaly the result histogram of time diferences is proportional to the pulse shapes. I solve this problem enabling 20MHz LPF filter in ZT4612, so the pulses are wider and overlaped on larger area. But, how it is with the V4 board? Will it trigger if I have for example one 5ns pulse on begiinning of CH1 and second pulse for example 50 ns later on Ch2 with the same probability when pulses are in the same time position?
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Wed Mar 21 09:33:00 2012 |
Martin Petriska | triger for measuring time between pulses in channels |
Stefan Ritt wrote: |
Martin Petriska wrote: |
I have two BaF2 detectors with PMT connected to Ch1 and Ch2. At this time Im using external triger module to start DRS4. My evalution board is version 3 so I have no possibility to trigger on two or more pulses occurence on different channels. But I have this idea, trigger with analog trigger on channel 1 (start detector) will start measurement on all channels. After that using FPGA inside EVM to look if some value in Ch2 is bigger as treshold value for example 0,5V and if yes then send data by USB to PC, if signal in Ch2 is lower then restart measurement and wait on triger in Ch1. This way I want to eliminate false data transfer throw USB. Is this possible to implement it into DRS4 evaluation board firmware ?
Thanks.
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It is muuuuch easier to upgrade to a V4 board!
Modification of firmware is not so easy. You have to learn and understand VHDL. Then, you have to add additional registers for this thresholds, which requires modification of the C library as well. The data inside the evaluation boards is not yet calibrated (this is only done on the C library), so you have an uncertainty of 30-40mV in this data.
|
Ok, except this, I would have a question regarding to the new trigering posibility in V4 board. At this time, I am using Ztec ZT4612 which has some pattern triger posibility. Output from this card is used as an external trigger. Regarding this I have found a problem. Pulses from PMT have about 5-8 ns width. But I need to measure time diferences between pulses in range from 0-50ns. Problem is, that coincidence between pulses is working only on short pulse area (5-8ns) when they are overlapped. Additionaly the result histogram of time diferences is proportional to the pulse shapes. I solve this problem enabling 20MHz LPF filter in ZT4612, so the pulses are wider and overlaped on larger area. But, how it is with the V4 board? Will it trigger if I have for example one 5ns pulse on begiinning of CH1 and second pulse for example 50 ns later on Ch2 with the same probability when pulses are in the same time position? |
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