I have a Simulink model which outputs some data in fixdt(1,16,0.01,0). I want to access this data through a CAPL script. What is the best way to do this?
I have tried system variables but CANoe System Variable Output block does not support fixdt.
Related
I've been handed a simulink model. I'd like to use simulink's code generation features to compile it into a binary and then run it on an embedded system (a beaglebone black). From there, I want to query it for output as a stand-alone component of a more complicated system.
I am having trouble finding where to specify the interface behavior to the compiled model.
I want to start the simulink model (with a python os.system() call, probably) with some default arguments (like starting parameter values for the model blocks), and then capture its output, which should be the values reported at each outport at each tick (the model has an internal clock and reports values at given intervals).
I have been able to blindly compile it into an *.elf binary and deploy it to the embedded device, and it runs, but the only thing that happens is i get the string **** model running **** on STDOUT.
What's the easiest way to specify command line arguments into this compiled binary?
If the answer is "generate the code and then edit it by hand to pass arguments in", how do I persist the hand edits between re-generations of the code when the simulink model changes?
How do i make simulink outports report on STDOUT ?
I want to continuously read simulink signal data into the command line while the simulation is running. get_param() seems to be blocking so that doesn't quite work when put in an infinite while loop.
I'm now trying to use a UDP send block but I can't seem to receive data. My UDP block sends data to localhost over remote port 25000 and local port 25001.
In matlab I use the following code but it simply times out with no data
u=udp('127.0.0.1', 25001,'LocalPort',25000);
fopen(u)
fread(u)
fclose(u)
delete(u)
What are my options to continuously read out simulink signal data into Matlab CLI?
Control Simulation Using the "set_param()" command like follows:
set_param('sys','SimulationCommand','WriteDataLogs')
For a working example, type "sldemo_varsize_basic" in the matlab command window. Then above command becomes
set_param('sldemo_varsize_basic','SimulationCommand','WriteDataLogs')
If you set the simulation time to sufficiently large and start the simulation, the "simout, simout1", "tout" and "xout" variables are created/updated in the workspace every time you issue the command above.
Unfortunately, I was not able to find a good quality documentation of this feature.
Are you trying to store the value of your model outports DURING simulation? This is not possible because the variables 'simout, simout1", "tout","xout" etc are created only once simulation is OVER.
In order to read/store the value of outports during simulation, you will have to attach an 'Runtime Object' to the outports.
Refer 'Access Block Data During Simulation' in the Simulink documentation or see this link: http://in.mathworks.com/help/simulink/ug/accessing-block-data-during-simulation.html?s_tid=gn_loc_drop
Hope it helps :)
This question has already been answered here using RunTime Objects as I have described above:
https://stackoverflow.com/a/17006419/6580313
I'm using Simulink to build a subsystem, which will then be built up using Simulink Coder to get an executable. I want to include this executable into my main function that is not necessarily written using Matlab. The main function is to implement a non-real time, desktop deployed feedback loop, i.e., (1) read out the output of the subsystem, (2) calculate a new input based on the reading, (3) send the new input to the subsystem.
I've managed to build-up a desktop deployed executable of the subsystem using RSim target. But in the main function (for test purpose, I am using Matlab to write the main function), the executable is one-off executed, where I can't read its output or assign new input during its running.
Thanks & Regards.
Yes
If you want to do a closed loop simulation, you most certainly need access to the simulink solver internal step() function. This can be achieved when you build a dll file and then include it via the header files etc. in your other simulation engine. But to be able to do this you need an embedded coder license. use the ert_shrlib.tlc target.
I have a simulink model connected to my hardware and I am able to see the response on my scope when I change the setpoints in my model etc. But I will like to save this data from the scope so that later I can plot it.
I have read some documentation online but I am still confused. Can someone give me a step by step method on how to plot this data from the scope used in external mode.
Kind Regards
There is a write data to workspace block in simulink. You can put that block in the same bus as the scope and save the data to Matlab. If you want it automatically save into the disk, then I recommend to write a small .m script that takes this variable and saves in disk using save(). You can automatically run this .m file after the Simulink model is stopped (or some other condition you prefer) going to Properties->Callbacks and choosing the appropriate function callback.
I want to retrieve the data from simulink during simulation, and use serial network function to send these data to another program. Because I need to use another program to do some tricks and send command back to simulink, so I have to get data from simulink during runtime so that another program can make the right command.
I've tried using To Workspace block to export the data.
However, I can only got value in the very beginning of the simulation.
And I've also tried using scope and change some properties: check Save Data To Workspace and Uncheck Limite data to Last.
First, I started simulation, and I found the ScopeData didn't appear in the Workspace. Only when I stop simulation, ScopeData would appear in workspace.
And after that, I can use ScopeData.signals.values to get values.
But what I want is: when I start simulation, ScopeData would appear in workspace so that I can send these data to other program.
Does anyone know how to achieve this?
I found this page might be helpful, but I still don't know how to continuously export data during simulation.
Use get_param to read data from just at the current time. Also to send the data back to Simulink with set_param of a gain or another block.
An example of get_param
First load and start the simulation:
load_system('myModel')
set_param('myModel','SimulationCommand','Start');
To read data on any line of your simulink model:
Get a simulink block object (let's try a Clock with the name Clock):
block = 'myModel/Clock';
rto = get_param(block, 'RuntimeObject');
Then get the data on its first (or any) output port (or input) of that block.
time = rto.OutputPort(1).Data;
You could do the reading, in a timer callback.
Also this might be helpful: Command Line Functionality for Simulink
During simulation Simulink stores logged data in an internal buffer and only writes the data to the Workspace when the simulation is paused or stopped.
It sounds as if you really need to write an S-function (which will get signal values on a timestep-by-timestep basis) and communicate with Proteus that way.
Of course Simulink is a non-realtime simulator, so if you are talking about doing anything resembling real-time control then you are most likely taking the wrong approach altogether.
At any time during simulation you can force Simulink to write the simulation output data to the workspace:
set_param(bdroot,'SimulationCommand','WriteDataLogs');
I've found that this command is quite unstable in my Matlab 2010a for Win64. In particular I have to avoid it when simulation is stopped (i.e. first check
get_param(bdroot,'SimulationStatus') ), otherwise Matlab shows an error and asks to be restarted.