Effacer les filtres
Effacer les filtres

S-function works in normal mode but doesn't in external mode

2 vues (au cours des 30 derniers jours)
Arthur Nascimento
Arthur Nascimento le 25 Fév 2019
I'm trying to implement a simple s function builder ode solver for a rlc circuit, it is suposed to return the value of the capacitor voltage.
While it works fine in normal mode.
2019-02-25.png
when deployed to TI TMS320F28379D the response remais at 0, it simply doesn't work. It builds and deploys fine.
2019-02-25 (1).png
Any help is aprecciated.

Réponses (3)

Venkatesh Chilapur
Venkatesh Chilapur le 26 Fév 2019
Hi,
When deploying the model on target we configure it for Fixed step disctere solver as the controller runs in discrete amount of time. It also depends on the step time your model is configured to run. If the model is configured to run fast, then the external mode may not work.
HTH,
Venkatesh C
  1 commentaire
Arthur Nascimento
Arthur Nascimento le 26 Fév 2019
Hello, thanks for the answer, this is how the solver is set up:
2019-02-26.png
I also tried some higher values fo the fixed step time, same problem.

Connectez-vous pour commenter.


Venkatesh Chilapur
Venkatesh Chilapur le 27 Fév 2019
Can you do a crtl+j and send the snap of Sample Time Legend that pop's up as below.
Capture.JPG
  1 commentaire
Arthur Nascimento
Arthur Nascimento le 27 Fév 2019
Modifié(e) : Arthur Nascimento le 27 Fév 2019
The model along with the s function files are attached, something tells me that the external mode isn't calling the "update" part of the code.

Connectez-vous pour commenter.


Venkatesh Chilapur
Venkatesh Chilapur le 4 Mar 2019
Hi,
Could run the model in external mode and could recieve only zero.
I have not debugged the S-Function, but I can recommend to start with simple model and see if that works.
I could see a sample time of 0.2sec in your attached model. You may try to run at this rate.
Regards,
Venkatesh C
  1 commentaire
Arthur Nascimento
Arthur Nascimento le 11 Mar 2019
Hello, I have found the problem to be the use of the simStruct functions. I was using it to get the sample time value. While it works fine in normal mode, it doesn't seem to work in external mode. I need to set the sample time in simulink configs and set the same sample time in the code for the solver to run properly. Thanks for the help anyway!!

Connectez-vous pour commenter.

Catégories

En savoir plus sur Simulink Coder dans Help Center et File Exchange

Produits


Version

R2018a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by