Saving all data from a while loop

I already asked a similar question but it might not be very clear and there were some concepts that I could not well understand.
1. I have a key pad to generate DTMF stream signal (I call it stream because it contains multiple tones which make up of a complete phone number)
2. I would like to save it as a wav file but I guess other format is okay and because the write to wav file does not support append so for this particular case, I use write to waveform instead of write to wav
My approach is to have a queue structure so I can write each iteration result to a file.
i)When I try to retrieve the data, there is nothing but 0.
ii)my intention is to get 8000 sample per second (fs = 8,000) but it save the data so fast
I attached the file so if there is way to solve the problems, please help me.
Solved!
Go to Solution.
Attachments:
SignalGenerator.vi ‏52 KB

I believe what is happening is that your producer loop is iterating even when there is no key press and sending blank or default data to the consumer and overwriting the test.wav file.
Easy way around this is to put an event structure in the producer that only enqueues data when there is a key press. I can't see into the Mathscript node so I'm not sure what's going on there, but I suspect the default output (e.g all of the Booleans are false) is for zero-length arrays on f1 and f2 and this is getting enqueued and overwrites any real data that might have been in test.wav.
It should be possible to append to a .wav. I have attached a proposed method. Caution that this in your consumer will take longer and longer as the file grows as it needs to read in the file every time.
Attachments:
Untitled 3.vi ‏8 KB

Similar Messages

How can I write waveform data from a while loop?

Alright, I have a NI-5122 high speed digitizer that I need to acquire 10,000 waveforms. I am currently using the NI example code "niScope EX Multi Record Fetch More Than Available Memory.vi" to do this and then onto that later. I set the Number of Records to 10,000, min record length to 8192, and the min sample rate to 100M (S/s). On the Fetch vi, I set it to get a 1D Dbl array and then send it to the while loop edge for auto indexing. What I want is to take each waveform and write it to a file next to the previous waveform not append it to the bottom of the previous one. I can do 100 and sometimes 1000 waveforms with my current setup and then use "write measurement to file.vi" to save the data, but at 10,000 it says that the memory is full. I have 256 MB on the NI-5122 and 4G of memory on my host computer. My reasoning is that if the NI-5122 can hold all that data then why can't my host computer. I have tried to fetch using 2D Dbl and transpose that matrix and send the data to "write measurement to file.vi" inside the loop and append the data that way, but when I do this the card does not acquire any data. Which seems like a software problem. I know this is probabaly worded poorly, so just post a response if further explanation is needed.
Thank you.

Hello,
It sound like you might have received a LabVIEW: Memory is full message. Are you also graphing this data as it is being acquired? Are you building an array inside the loop? At the 100 MS/s rate, you are using a lot of memory to acquire, graph, build and transpose array data, and then write to file. If you are saving to file and do not necessary need to see the data, I would suggest taking the graphical indicator out of the code. Please review some of the KnowledgeBases linked below about the LabVIEW: Memory is full.
KB 36QD14V3: Why Do I Receive a "Memory is Full, VI Stopped at Loop Tunnel 0xXXXX" Error?
KB 3ZNDGRS9: LabVIEW "Memory is Full" Error
Samantha
National Instruments
Applications Engineer

How to export a continous waveform data from a while loop?

Hello there,
I need to add noise signal to my waveform which is read from a binary file. I use noise generate vi (deleted the density part) from NI example as my sub VI, and put it into a while loop in order to get the continous noise signal, but I don't know how to export this data. There's no waveform come out from the noise waveform output tunnel (on the while loop). I used output tunnel, didn't work, tried shift register, didn't work... Can anybody help?
Also, how to fix the dt problem for the noise generate vi and my original data ( from binarty file)
Thanks in advance!
Wendy

hi
I think notifier can do the trick (an example is shown in the master-slave template).
Another possibility can be a FG (or action engine, look for the nugget ActionEngine, it will change your LV-coding life !)
N

Getting data from a while loop while running.

Hello,
I did a program that call a sub-VI which is doing experiment and have its own timer.
The sub-VI is a while loop and the stop condition of this loop is the elapsed time of my timer.
What I want to do is to be able to get the elapsed time in my main program during the execution of the sub-VI (every second of its execution).
First I assign the elapsed time in the sub-VI as an output of it. But of course the elapsed time is only updated in the main VI only when the while loop has finished. So I tried several solution: property nodes, local variable, global variable.
When I am using global variable, I can see the elapsed time being updated during the while loop when I open the global variable VI. But the result is always the same: in the main VI the elapsed time is only updated at the end of the while loop.
I think that is the global variable is updated every time, I could be able to get its data to my main VI?
Does anyone have an idea?
Thank you,
Meach

I tried using shared variable and reference without succes.
I will keep searching.
I enclose my VI that I simplify the most but with still keeping the shape of my real program. If you can take a look I will really appreciate.
The goal is on the top-level VI to be able to see the updating data time in real time.
Thanks,
Meach
Message Edited by Meach on 07-23-2008 04:13 PM
Message Edited by Meach on 07-23-2008 04:14 PM
Attachments:
Elapsed Time.zip ‏25 KB

Best way to copy ALL DATA from song to song?

Hello everyone,
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I'd LOVE to somehow avoid #4 if possible. As I stated
above, my projects always change from the templates
due to extra audio tracks, audio instruments, etc, so
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Is there something I'm missing?
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Now my process is a little easier, however if you have any other tips so share please feel free to post.

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Re: exit from a while loop in sub vi

I think the mail didn`t get through first time. Repeat posting - Sorry if
this occurs twice
Shane
Hallo,
Can the use of occurrences solve this problem?
The Main program can create an occurrence which can be passed to the
sub-VIs. Upon pressing the button to cancel the loop, the occurrence can be
set, instantly transmitted to all other VIs sharing which were passed the
same occurrence. Of course a small handling routine has to be written (say
a sequence parallel to the executing while loop waiting for the occurrence
and then setting the exit parameter to "true") but this is trivial.
I have checked this with a small program splitting an occurrence to three
seperate VIs and it works.
If you want, I can send a cop
y of it.
It may well be possible with notifiers or something else, but I have far
less experience with them.
Hope this helps
Shane
>pcu schrieb in Nachricht
><[email protected]>...
>>Main vi has several sub-vi's. Each sub vi has a while loop and Boolean
>>button. When program runs, sub-vi front panel appears, and I can
>>stop/continue the while loop. But when I stopped a while loop in a
>>sub-vi, I cannot control other while loops in other sub vi.
>>I need exit function from a while loop, not stop function of entire
>>program.
>>Thanks.
>
>
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)

The notifier is probably better than occurence at this case - than it is not neccessry to write a parallel sequence.
The use of notifier is very simple, just follow an example in Help/Search example -> Advances -> Execution control -- Synchronization -> SubVI notification.
Good luck
Ferda

Exit from a while loop in sub vi

Main vi has several sub-vi's. Each sub vi has a while loop and Boolean button. When program runs, sub-vi front panel appears, and I can stop/continue the while loop. But when I stopped a while loop in a sub-vi, I cannot control other while loops in other sub vi.
I need exit function from a while loop, not stop function of entire program.
Thanks.

Hallo,
Can the use of occurrences solve this problem?
The Main program can create an occurrence which can be passed to the
sub-VIs. Upon pressing the button to cancel the loop, the occurrence can be
set, instantly transmitted to all other VIs sharing which were passed the
same occurrence. Of course a small handling routine has to be written (say
a sequence parallel to the executing while loop waiting for the occurrence
and then setting the exit parameter to "true") but this is trivial.
I have checked this with a small program splitting an occurrence to three
seperate VIs and it works.
If you want, I can send a copy of it.
It may well be possible with notifiers or something else, but I have far
less experience with them.
Hope this helps
Shane
pcu schrieb in Nachr
icht
<[email protected]>...
>Main vi has several sub-vi's. Each sub vi has a while loop and Boolean
>button. When program runs, sub-vi front panel appears, and I can
>stop/continue the while loop. But when I stopped a while loop in a
>sub-vi, I cannot control other while loops in other sub vi.
>I need exit function from a while loop, not stop function of entire
>program.
>Thanks.
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)

How can I transfer data between two while loops in parallel

Hello,
I have two while loops in parallel and I want to transfer data from the first to the second loop. The problem isthat data are transfered only when the first loop ends. I tried with queue but it doesn't work. How can I do, preferentially without global variable ?
Thanks.

I join a very simplified VI's because the real works with PXI, RT, ...
When you run the "secondVI.vi", no data comes in array from the "firstVI.vi".
As I said in my first message, I tried with queue too but it doesn't work, because when the terminal go out from the while loop, while loop have to be ended to send data.
Attachments:
transfer_data.zip ‏20 KB

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Selecting all data from employee where foreign key = null and show it in view

Hi guys i have view like following :
SELECT dbo.Nationality.NationalityName, dbo.Employee.DriverName, dbo.Employee.DriverID, dbo.Employee.NationalityID, dbo.Employee.ResidentNo,
dbo.Country.CountryName, dbo.Employee.CountryID, dbo.Branch.BranchName, dbo.Employee.BranchID, dbo.Employee.JoinDate,
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suppose i need to show all data from Employee table (NationalityName,BranchName,JobName) where
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WHAT I DO
Notes : I mean in topic(selecting all data from view not table
meaning i need to show all data in employee table by view
in case of forign key(any forign key)equal null

I think you need to change
FROM dbo.Nationality INNER JOIN
dbo.Employee ON dbo.Nationality.NationalityID = dbo.Employee.NationalityID
to
FROM dbo.Nationality
LEFT JOIN
dbo.Employee ON dbo.Nationality.NationalityID = dbo.Employee.NationalityID
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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How to out from infinite while loop in sub VI

Dear Sir,
how to out from infinite while loop in sub VI from main VI
attached photo for solution but I can't understand it and i can't find the function in photo
please help
Attachments:
stop_subVI_frm_main.JPG ‏36 KB

Asking how to get out of an infinite loop is like asking how to find the end of a circle. I'm not trying to be sarcastic but by definition, if there is a way out of the loop, then it is not infinite. I think what you are asking is how to avoid creating an infinite loop. Is there something about the suggestions you have been given that you do not like? My favorite suggestion is the notifier but maybe you just need an example. Turn on context help and read about the notifier functions in the code below.
This is your top level VI
And this is your subVI
If this seems too complex then a global variable will work too. But what seems simpler can cause much more complex bugs. You can code fast and spend lots of time debugging or you can code slow and spend less time debugging. Personally I perfer writing productive code than looking for bugs any time.
=====================
LabVIEW 2012

Saving all data from a while loop

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