How to change baud rate for STM32 F769I-Discovery in Simulink for PiL-Simulation?

Hi guys,

for a PIL-Simulation with serial connection (USB), I want to change the PIL baud rate for an STM32 F769I-Discovery:

I tried to change the PIL baud rate to e.g. 1000000 Bd. After I compiled my model, it doesn't run with my desired baud rate and it returned an error. When I left the baud rate to 115200 Bd (default), Simulink compiled my model and ran it with 115200Bd.

Is there an error or why can't I change the baud rate for a STM32-F769I Discovery although there is an option to change the baud rate (see picture above)?

Greetings

RL

[Yukthi S]

Hi @Radavid Lim

Can you send the errror message?

[Radavid Lim]

Hi Yukthi,

this is the error message:

The timeout of 10 seconds for receiving data from the rtiostream interface has been exceeded. There might be multiple reasons for this communications failure. You should: (a) Check that the target hardware configuration is correct, for example, check that the byte ordering is correct. (b) Confirm that the target application is running on the target hardware. (c) Consider the possibility of application run-time failures (e.g. divide by zero exceptions, incorrect custom code integration, etc.). Note (c): To identify possible reasons for the run-time failure, consider using SIL, which supports signal handlers and debugging. If you cannot find a solution, consider using the method setTimeoutRecvSecs of rtw.connectivity.RtIOStreamHostCommunicator to increase the timeout value.

Anytime I want to change the baud rate the above message appears. I just can run the model with 115200 Bd only. I can't increase nor decrease the value of the baud rate. And I also tried to use the Ethernet connection but the board will no be detected....

Answer 1

[Abhinav Aravindan]

Hi Radavid,

It appears that you are facing an issue with “Code Verification and Validation with PIL” at a Baud Rate higher than the default using “STM32 F769I-Discovery board”. You may consider trying the following:

1. Select the “STM32F7xx Based” target in the hardware selection dropdown.
2. Proceed with the “STM32CubeMX” workflow for PIL instead of using the “Legacy” workflow of selecting the STM32F769-Discovery hardware board.

Please find below the relevant documentation for your reference.

https://www.mathworks.com/help/releases/R2024a/ecoder/stmicroelectronicsstm32f4discovery/ug/External-mode-PIL.html

https://www.mathworks.com/videos/using-simulink-with-stm32-discovery-and-stm32f4xx-based-boards-1637578171735.html

I hope this helps resolve your issue!

[Radavid Lim]

Hi Abhinav,

for 1.: When I choose "STM32F7xx Based" in the Hardware settings, I cannot change the Baud rate for the PiL section.

for 2.: I have a Simscape Model with a controller that is saved as an atomic subsystem on a separate file. That controller should run on the STM32 controlIer while the Simscape Model runs on Simulink on a computer. I don't know how to configure that via the STMCubeMX Programme. When I run my model with 115200 Bd, it runs extremely slow.

Greeting

RL

[Abhinav Aravindan]

Hi Radavid,

1. The Baud Rate can be set in the IOC file in STM32CubeMX project.
2. I assume that you are using a Subsystem Reference block treated as an Atomic unit in your model which you want to test with PIL. To do this, you can follow the instructions present in the following documentation under Task 3.

https://www.mathworks.com/help/ecoder/stmicroelectronicsstm32f4discovery/ug/STM32F4xx-PIL-example.html

[Radavid Lim]

Hi Abhinav, in the example you gave me, the baud rate can be configured via connectivity in the hardware settings. The STM32F769I-Discovery doesn't has the connectivity tab (see picture of my question). How do I configure the USART/UART specifically with the STM32F769I-Discovery?

[Abhinav Aravindan]

Hi Radavid,

I assume you have selected "STM32F769I-Discovery" instead of "STM32F7xx Based" option in Hardware Board which was the suggestion in my earlier answer. With "STM32F7xx Based" selected, you can configure USART/UART in the "Connectivity" tab, and proceed with the example as indicated. With this wokflow, you can try setting the desired Baud Rate in the IOC file.

[Radavid Lim]

Hi Abhinav,

there are two "STM32F7xx Based" choices for the Hardware board ("STM32F7xx Based" - Single Precision FPU and "STM32F7xx Based" - Double Precision FPU). Which one should I choose? Also on the Hardware board settings there is an operating system/scheduler tab in which i should choose between Baremetal and FreeRTOS? Which one should I choose? Plus on the connectivity tab, the Ethernet port is greyed out and on 17725. Why is this greyed out?

Greetings

RL

[Nithin]

The STM32F769I-Discovery is a double-precision target. You can choose either operating system as both are supported. The IOC file must be modified accordingly. The Ethernet port is greyed out because it is fixed to 17725 at present.

Hope this resolves your queries!

[Radavid Lim]

Hi Abhinav and Nithin,

I tried to change the Baud rate via the STM32MXCube Programme but it didn't work....I run the PiL-Simulation with the SIL/PIL Manager App.

Greetings

RL