I have a simulink model and I generate the code using simulink coder for Generic Real-Time target.
I then copy the generated files (*.c and *.h) into my project in MPLAB.
Here I have the main.c file and here I use MdlStart() for initializing the model one time and then in infinite loop I use MdlOutputs() and MdlUpdate() for running the model. Everything works fine.
Now actually I want to speed the execution of the model and therefore I want to split my model into sub-systems and execute the sub-system only when required (e.g. I want to execute some sub-systems everytime and some only every few ms instead of everytime). I could split the model into subsystems and also made every sub-system atomic so that I get the different function for every sub-system. Now these different sub-system's functions are called from MdlOutputs() and MdlUpdate(). So they execute everytime the model is executed.
Actually I want to use some timer in my MPLAB project and then execute few sub-systems lets say at every 100ms. I also do not want to modify the auto-generated *.c and *.h files.
So instead of executing these sub-system's functions everytime through MdlOutputs() and MdlUpdate(), Is it possible to call the sub-system's functions from my main.c file without touching the auto-generated *.c and *.h files?
I hope that I have explained it well.
waiting for your help.
You should try to model everything you are trying to do with subsystems inside Simulink. For example, you can use "Enabled subsystems" or "Triggered subsystems" to create subsystems which run only on some time steps. I am not sure what kind of timer you are referring to. If it is Simulink time then you would need to run different subsystems at different sample rates which would give you a multirate model. If your timer is just another external source, then try triggered or enabled subsystems. That is the best way to avoid modifying generated files.
Doc for these subsystems are at http://www.mathworks.com/help/simulink/conditional-subsystems-1.html.
Related
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.
We are developing an ABM under AnyLogic 7 and are at the point where we want to make multiple simulations from a single experiment. Different parameters are to be set for each simulation run so as to generate results for a small suite of standard scenarios.
We have an experiment that auto-starts without the need to press the "Run". Subsequent pressing of the Run does increment the experiment counter and reruns the model.
What we'd like is a way to have the auto-run, or single press of Run, launch a loop of simulations. Within that loop would be the programmatic adjustment of the variables linked to passed parameters.
EDIT- One wrinkle is that some parameters are strings. The Optimization or Parameter Variation experiments don't lend themselves to enumerating a set of strings to be be used across a set of simulation runs. You can set a string per parameter for all the simulation runs within one experiment.
We've used the help sample for "Running a Model from Outside Without Presentation Window", to add the auto-run capability to the initial experiment setup block of code. A method to wait for Run 0 to complete, then dispatch Run 1, 2, etc, is needed.
Pointers to tutorial models with such features, or to a snip of code for the experiment's java blocks are much appreciated.
maybe I don't understand your need but this certainly sounds like you'd want to use a "Parameter Variation" experiment. You can specify which parameters should be varied in which steps and running the experiment automatically starts as many simulation runs as needed, all without animation.
hope that helps
As you, I was confronted to this problem. My aim was to use parameter variation with a model and variation were on non numeric data, and I knew the number of runs to start.
Then i succeed in this task with the help of Custom Variation.
Firstly I build an experiment typed as 'multiple run', create my GUI (user was able to select the string values used in each run.
Then, I create a new java class which inherit from the previous 'multiple run' experiment,
In this class (called MyMultipleRunClass) was present:
- overload of the getMaximumIterations method from default experiment to provide to default anylogic callback the correct number of iteration, and idnex was also used to retrieve my parameter value from array,
- implementation of the static method start,
public static void start() {
prepareBeforeExperimentStart_xjal( MyMultipleRunClass.class);
MyMultipleRunClass ex = new MyMultipleRunClass();
ex.setCommandLuneArguments_xjal(null);
ex.setup(null);
}
Then the experiment to run is the 'empty' customExperiment, which automatically start the other Multiple run experiment thru the presented subclass.
Maybe it exists shortest path, but from my point of view anylogic is correctly used (no trick with non exposed interface) and it works as expected.
I've been having this issue since I started using this Simulink model. No matter what I try, Simulink rebuilds the model every time I run it. I've taken a look at the checksums using the following procedure:
>> [cs1, cs1det] = Simulink.BlockDiagram.getChecksum(<model name>);
>> (Here I hit run on the model without changing anything)
>> [cs2, cs2det] = Simulink.BlockDiagram.getChecksum(<model name>);
>> cs1 == cs2
1
1
1
1
Why would Simulink rebuild the model if the checksums are the same? I did create another model with some simple logic in it and after compiling once I was able to run it multiple times without Simulink recompiling it.
Additionally, when I hit run when in Rapid Accelerator mode I notice that an asterisk pops up next to the model name in the title. Since this means that the model has unsaved changes, could running it cause any changes to be made? I've checked the callback methods and there's nothing being run when the sims starts (in fact there's nothing in any of the callback methods).
Is there some kind of basic compilation / initialization / build that Simulink runs through before it runs every time? I'm trying to run my model in Rapid Accelerator mode without having it recompile since it takes roughly 45 minutes to compile every time.
Have I overlooked some configuration parameter of the model? Is there some global MATLAB/Simulink variable I need to change?
Is it building or is it updating?
Typically, when you hit the Run button, MATLAB has to propagate signals, check your model for errors, initialize variables . . .
It may seem like building, but to actually confirm it is building, check to see of you have yourmodelname.c file in the folder.
Also check File Menu preferences, and go through the functions there and see if something is getting called.
Could you try to set Configuration Parameter -> Code Generation -> Interface -> Code replacement library to None (In case that your demand is not related to GNU library ...) on reference model?
By the way, it is working for me.
I am looking to set up a test set for an existing Simulink model. Ideally I could take full control of the model, explicitly stepping it and measuring the state of any signal on any bus in the model.
As might have been gleaned, this is the precursor of a unit testing system for the model. Being so, I can't really justify changing the model to suit the test, the test must accommodate the model as-is.
The furthest I've got so far is using load_model() to return a handle to the model. From there there seems to be a quite obscure set of functions for accessing the model. I can't see any that relate to accessing states and can't see any further commands that relate to accessing a loaded model.
The easiest way is to use the Data Import/Export function within the Simulink Preferences.
Set the checkbox States and it will store every state of your system for every time step in your workspace, also when you pause the simulation or execute it step by step.
Be aware not to set Save simulation output as single object, in this case the access would be more complicated and you need to follow the instructions here.
To add to the other answer, you probably want to check this page in the documentation: Control Simulation Using the set_param Command. Of interest are the following commands:
set_param(<model_name>, 'SimulationCommand', 'start')
set_param(<model_name>, 'SimulationCommand', 'pause')
set_param(<model_name>, 'SimulationCommand', 'WriteDataLogs')
set_param(<model_name>, 'SimulationCommand', 'continue')
Replace <model_name> by the path to your model file.
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.