Synchronizing LABVIEW USART and stm32 's one

Hi all!
I try to control stm32 usart by using labview to send USART parameters for example the baudrate. so to make things clear i'll give an example :
initially the stm32 and labview has both 9600 of baudrate,the user chooses 115200 (on labview interface) in order to communicate with this baudrate for the next operation. the problem is that i can't change the baudrate of visa to 115200 because stm32 still configurated on 9600 .
so i got an idea:
- i send the information 115200 without changing the visa baudrate (still at 9600)
-stm32 receive the information 115200 but don't change the configuration of usart (still 9600)because he need to tell labview that he will configurate its USART
-stm32 send (with 9600 baudrate)to labview that he will configurate its USART
-labview already changes its baudrate to 115200 (while stm32 changed its USART to 115200)
==> now the both of them are configurated at 115200 baud
my problems are:
-is this solution the right one?
-if yes how to make labview change the baudrate and make him choose between the old baudrate (9600)and the new one(115200)?
i'll be greatfull if someone helpe me and get me some advices?!
Best regards
Solved!
Go to Solution.

What you are basically describing is a simple confirmation exchange method. LabVIEW tells the micro to change its baud rate. The micro responds by saying "OK, I'm going to change". Your LabVIEW app then assumes that the micro changed its baud rate, so it goes ahead and changes its baud rate to match. Presumably you have a simple "are you there command" that can be sent to the micro to verify the baud rate change. If not, it's probably worth considering.
As for your question regarding the baud rate change in LabVIEW, one simple solution is close the existing VISA session, and call the VISA Configure Serial Port VI with the new baud rate.

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DGU wrote:
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Solved!
Go to Solution.

I'm guessing this is a bug that NI needs to fix. I see no reason you shouldn't be able to install the run-time engine of an older version. I'd be interesed in if it allows you to install the older development environment, which also includes the older run-time engine. There are some command line switches for NI installers as mentioned here:
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Go to Solution.

The LabVIEW Report Generator in LabVIEW 2010 and more recent versions does, indeed, work very well with Excel in Office 2010. I helped someone about two weeks ago with a problem saving a series of measurements to a (new) Excel Workbook. Your problem differs in two ways -- you want to save in an existing Excel file (why? Aren't you worried about overwriting data, or are you trying to add a new WorkSheet, or append to the end of an existing WorkSheet?) and making a Chart. I've not tried charts, so don't have advice right now.
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Need Expert's Advice - How to use LabView Efficiently and to increase Readability

My application is fairly complex. It is a real world testing applications that simultaneously controls 16 servo motors running various stress testing routines asynchronously and all at the same time. The application includes queues, state machines, sub VI's, dynamically launched VI's, subpanels, semaphores, XML files, ini files, global variables, shared variables, physical analog and digital interfaces and industrial networking. Just about every technique and trick that LabView 2010 has to offer and the kitchen sink as well.
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Sometimes there are too many wires. Much of my state machines have a dozen or more wires just going from input to output, doing nothing, just because one or two states in the machine need that variable in some state. Yeah, I could spend alot of time bundling and unbundling and rebundling those values, but I don't think that would improve things much.
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All and all, I can make it work, but I am not happy about the end result.
I am hoping to benefit from some expert advice from those that are experienced in producing large complex applications efficiently, debugging efficiently and producing readable diagrams that they are proud of.
Can anyone offer their advice on how best to use the LabView features to achieve these results in complex applications? I hope that you can help show me the light.

I'm not an expert but I'm charged out as one at work.
I am off today so I'll share some thoughts that may help or possibly inspire others to chime. I have tried to continually improve my code in those areas and would greatly welcome others sharing their approaches and insights.
Note:
I do refactoring services to help customers with this situation. What I will write does not represent what we do in a code review since our final delverable is a complete final design and that is beyond the scope of this reply.
I'll comment on your points.
dbaechtel wrote:
My application is fairly complex. ...
While watching Olympic figure skating competion slow-motion replays, I learned how the subtleties of how the launching skate is planted while entering a jump can make the difference between a good jump and a bad one.
In software, we plant our foot when we turn from the design to the development. I have to admit that there where a couple of times when I moved from design to development too early and found myself in a situation like you have described.
How to know when design is done?
Waterfall says "cross every 't' and dot every 'i' " while Agile says "code now worry about design latter" and Bottom-up "says "demo working why bother designing" (Please feel free to coment on these over-simplifications gang).
My answer is not much more helpful for those new to LabVIEW.
My design work is done when my design diagrams are more complicated than the LabVIEW diagrm they describe.
dbaechtel wrote:
simultaneously controls 16 servo motors running various stress testing routines asynchronously and all at the same time. The application includes ...and the kitchen sink as well.
Have you posted any design documents you have? These will help greatly in letting us understand your application. More on diagrams latter.
Anytime I see multiple "variations on a theme", I think LVOOP (LabVIEW OOP ) . I'll spare you the LVOOP sales pitch but will testify that once you get your first class cloned off and running as a sibling (or child) you'll appreciate how nice it is to be able to use LVOOP.
Discalimer:
If you don't already have an OOP frame of mind, the learning curve will be steep.
dbaechtel wrote:
Still I am not happy with the productivity that LabVIEW 2010 has provided, nor the readability of my final product.
Sometimes there are too many wires....going from input to output, doing nothing,... spend alot of time bundling and unbundling and rebundling those values, but I don't think that would improve things much.
Full disclaimer:
I used to be of the same opinion and even used performance arguements to make my point. I have since, changed my mind.
Let me illustrate (hopefully). This link (if it works for you, use lefthand pane to navigate hierachy) shows an app I wrote from about 10 years ago when I was in my early days of routing wires. Even the "Main" VI started to suffer from too many wires as this preview from that links shows.
Clustering related data values using Type Definitions is the first method I would would urge. This makes it easier to find the VIs that use the Type def via the browse relationships>>>callers. If I implement my code correctly, any problem I believe is associated with a particualr piece of data that is a Type def has to be in one of the VIs that use that type def therefore easier to maintain.
When I wrote "related data" I am refering data normalization rules (which my wife knows and I picked-up from her and I claim no expertise in this area) where only values that are used together are grouped. E.G. Cluster named File contains "Path" and "Refnum" but not "PhaseOfMoon". This works out nicely with first creating sub-VI since all of the data related to file operations are right there whe I need it and it leads into the next concept ...
When I look at a value in a shift register on the diagram taking up space that is only used in a small sub-set of states, I concider using an Action Engine . This moves the wire from the current diagram into the Action Engine (AE), and cleans up the diagram. The AE brings with it built-in protection so provided I keep all of the opearations related to the the Type def inside the AE I am protected when I start using multiple threads that need at that data (trust me, it may not make a difference now but end users are clever). So that extra wire is effective encapsualted and abstracted away from the diagram you are looking at.
But I said earlier that I would not sell LVOOP so I'll show you what LVOOP based LV apps look like to contrast what I was doing ten years ago in that earlier link. This is what the top level VI looks like.
And this is the Analysis mode of that app.
I suspose I should not mention that LVOOP has wizards that automatically create the sub-VI (accessors) that bundle/unbundle the clusters, should I?
Continuing...
dbaechtel wrote:
We have had a long discussion about the use or misuse of Local variables...I also have a bug whenever I try and copy some code...
If you can simplify the code and duplicat ethe bug. please do so. We can get it logged and fixed.
dbaechtel wrote:
I am also having trouble using trouble using Variable Property Nodes....
That sounds like a usage issue. Posting code to illustrate the process will et us take a shot at figuring out what is happening.
dbaechtel wrote:
Creating subVIs is often not appropriate... My application already has over 150 sub VIs.
"Back in the day..." LV would not even try to create a sub-VI that involved controls/indicators. I use sub-VIs to maintain a common GUI often but I do it on purpose and when I find myself creating a sub-VI that involves a control/indicator, I hit ctrl-z immediately!
I figure a way around it (AE ?) and then do the sub-VI.
Judging by your brief explanation and assuming you do a LVOOP implementation, I would estimate that app need 750-1500 VIs.
dbaechtel wrote:
The LabView Clean Up Diagram function often works poorly....
THe clean-up works fine for how I use it. After throwing together "scratch code" and debugging the "rats nest" I'll hit clean-up as a first step. It guess good enough on simple digrams and in some cases inspires me to structure the diagram in a different way that I may not have thought about. If I don't like, ctrl-z.
Good deisgn and modualr implementaion led to smaller diagrams that just don't need thrre screens.
dbaechtel wrote:
My troubleshooting strategies don't work well for large diagrams and complex applications....Can anyone offer their advice on how best to use the LabView features to achieve these results in complex applications? I hope that you can help show me the light.
Smaller diagrams single step faster since the sub-VI run full speed. I cringe thinking about a 3-screen diagram with multiple probes open ( shivver!).
Re: Nestested structres
Sub-VIs (wink, wink, nudge, nudge)
If it works you have prven the concept is possible. That is the first step in an application.
I hope that gives you some ideas.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

LabVIEW FPGA: Multiple SCTL versus one SCTL (same clock domain)

Hello NI forums,
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See the attached picture from a modified version of the LabVIEW DRAM FIFO example. It probably explains my question more effectively than the paragraphs below.
What is the difference to the LabVIEW / Xilinx compiliers, if any, between placing two independent branches of code in the same SCTL, versus placing them in individual SCTLs (in the same clock domain)?
Misc. comments:
I have briefly experimented with this concept using the included LabVIEW DRAM FIFO example (example finder >> Hardware Input and Output >> FlexRIO >> External Memory >> Simple External Memory FIFO.lvproj).
I compiled the default example (the read and write interfaces are in separate 40MHz SCTLs) five separate times. Then I put the read and write interfaces in the same 40MHz SCTL and compiled another five times. The result (when both read and write interfaces were in the same SCTL) was a reduction in resource usage (according to the compilation summary).
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Background information:
My task involves acquiring 2 channels of analog data using the NI 5772 and PXIe-7966. Data acquisition takes place in a 200MHz SCTL, and downstream processing is performed in a 100MHz SCTL.
During a vast majority of the 100MHz SCTL processing stages of the FPGA VI, the 2 channels of data do not interact with eachother. So it would be easy for me to place them in separate 100MHz loops if doing so would somehow help the design (timing, resource usage, etc.).
Thanks!
Attachments:
question.png ‏76 KB

Intaris
Trusted Enthusiast
Posts: 3,264
Re: LabVIEW FPGA: Multiple SCTL versus one SCTL (same clock domain)
‎10-28-2014 12:11 PM
Just out of interest, what is the resource usage differential between the two versions?
In response to the above comment,
This is a little embarrassing, but it seems like the resource usage is similar than I initially thought for this particular example. I think the previous compilations that I based my assumption on coincidentally used more resources in the 2-SCTL loop case. I just compiled each version two additional times (see below).
Here's the version with everything in one loop:
Device Utilization
Total Slices: 17.6% (2587 out of 14720)
Slice Registers: 9.5% (5583 out of 58880)
Slice LUTs: 8.2% (4855 out of 58880)
DSP48s: 0.0% (0 out of 640)
Block RAMs: 2.5% (6 out of 244)
Device Utilization
Total Slices: 16.9% (2493 out of 14720)
Slice Registers: 9.5% (5583 out of 58880)
Slice LUTs: 8.3% (4858 out of 58880)
DSP48s: 0.0% (0 out of 640)
Block RAMs: 2.5% (6 out of 244)
Here's the version with the read and write in separate loops:
Device Utilization
Total Slices: 16.4% (2407 out of 14720)
Slice Registers: 9.5% (5583 out of 58880)
Slice LUTs: 8.2% (4852 out of 58880)
DSP48s: 0.0% (0 out of 640)
Block RAMs: 2.5% (6 out of 244)
Device Utilization
Total Slices: 19.4% (2859 out of 14720)
Slice Registers: 9.5% (5583 out of 58880)
Slice LUTs: 8.3% (4859 out of 58880)
DSP48s: 0.0% (0 out of 640)
Block RAMs: 2.5% (6 out of 244)

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Go to Solution.

Hello Michael,
I did find my issue. In my case a VI was not getting closed properly in cleanup due to the previous command not passing the handler out correctly. Thus this VI would remain open and when I ran another TestStand Sequence, when it tried to load that LabView VI it would just hang. But the result of this error could be seen when I closed TestStand and LabView stayed open (since it was frozen) or when done running the sequence and closing it. Then if you tried to pop-up LabView it would not show the starting splash screen because it had froze.
I found the problem by turning on the show VI front panel option in TestStand for all of the VI calls. The VI that stayed open was the problem VI.
Thanks everyone who responded for your help!
Kurtus

LabVIEW 2012 and LegoNXT

Hi,
Will my EV3 Lego mindstorm brick work with LabVIEW 2012 and LabVIEW Lego MindstormNXT 2012? Because when I'm installing LabVIEW module for Lego 2012, it'sprompting me to install LV2012 SP1. I already have LV2012 but NOT SP1.
Regards.

NapDynamite wrote:
The system in my lab has no SP1, probably the guy over here never bothered to install that update. Now when I checked those updates to install SP1, the update service is locked for this patch and is asking for renewal of subscription.
My boss, who is not very cognizant of software stuff, is now asking me to use the EV3 software which comes along with LEGO pack becuase he's not ready to spend much to renew.
And my dream of teaching LabVIEW to school kids is now in vain.
Regards.
In vain?
A bit dramatic isn't it?
One license is $99.
Site license is $570.
http://sine.ni.com/nips/cds/view/p/lang/en/nid/210666

Synchronizing LABVIEW USART and stm32 's one

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