MATLAB/Simulink XCP protocol via LPUART1

[JellyFish]

Hi all,

I failed to run Nucleo-G431RB board using Simulink "Monitor & Tune" mode via Simulink XCP protocol.

I've got the error message at Simulink,
"Could not connect to target application: XCP internal error: timeout expired, in response to XCP CONNECT command"

There has been no problem for Simulink "Build, Deploy & Start".

I followed an example from the link below.
https://www.mathworks.com/help/ecoder/stmicroelectronicsstm32f4discovery/ug/STM32F4XX-ADC-example.html

I've already changed Simulink model configuration to run Nucleo-G431RB LPUART.
- Hardware board = STM32G4xx Based
- Hardware board settings> Build options> Create> Select hardware = NUCLEO-G431RB
- Connectivity > USART/UART = LPUART1
- Connectivity > Serial port = COM1 (same port for STMicroelectronics STLink Virtual COM Port)

MATLAB related version:
- MATLAB 2023a
- Embedded Coder Support Package for ARM Cortex-M Processors V23.1.0
- Embedded Coder Support Package for STMicroelectronics STM32 Processors V23.1.3

STM32 related version:
- STM32CubeMX V.6.4.0
- STM32Cube_FW_G4_V1.5.1

I've read the similar post below, but couldn't figure out what was the problem.
https://community.st.com/t5/stm32-mcus-products/nucleo-g491re-communication-error-with-matlab-simulink-xcp/td-p/82065

Thank you in advance!

[JellyFish]

Let me attach the ioc and Simulink files.

[STTwo-32 · Accepted solution]

Hello @JellyFish and welcome to the ST Community.

For support on MATLAB/Simunlink, i suggest you to use the MATLAB Community https://www.mathworks.com/matlabcentral/content/communities.html.

Best Regards.

STTwo-32 

[JellyFish]

Thanks for the reply.

For the others who might go through similar problems,
This issue was solved by changing the order of Generated function call at STM32CubeMX.
"MX_DMA_Init" should be ahead of "MX_LPUART1_UART_Init".

[JakeBrake101]

MATLAB say the same but backwards bro~

Better be helpful and attend your audicence instead of send over and over to other provider, your circus your monkeys pal!

[JakeBrake101]

I had the same issue with NUCLEO-G474RE trying to make a PIL control. no luck there.

Then I downgrade the project to this one:

https://www.mathworks.com/help/ecoder/stmicroelectronicsstm32f4discovery/ug/Monitor-Tune-example.html

It mentioned the use of USARTx tho...

Still not working, so I jumped from MATLAB 2024a to 202b to 2025a. Still the same, changed cables 4 times, uninstalled/instaled the drivers on Device manager (Windoze 11), use/unuse LPUARTx, put in different directories, changed names to be shorter and without spaces in order to Windoze/MATLAB do not protest, then I followed an infinite number of links on MATLAB:

https://www.mathworks.com/matlabcentral/answers/1939784-stm32f407vgt6u-disc1-external-mode-could-not-connect-to-target-application-xcp-internal-error

https://www.mathworks.com/matlabcentral/answers/1762895-external-mode-open-protocol-checkdata-command-failed-error

https://www.mathworks.com/matlabcentral/answers/1939784-stm32f407vgt6u-disc1-external-mode-could-not-connect-to-target-application-xcp-internal-error

https://www.mathworks.com/matlabcentral/answers/2106356-external-mode-open-protocol-checkdata-command-failed

https://www.mathworks.com/matlabcentral/answers/1567058-error-in-simulink-when-using-arduino-uno-for-motor-speed-reading

https://www.mathworks.com/matlabcentral/answers/1850793-simulink-error-while-running-controller-on-hardware-using-arduino

And still not working. 

Changed to another board I have (NUCLEO-F334R8), and worked as MATLAB directed.

Again returned to NUCLEO-G474RE, upgraded to the latest firmware for the STLINK-V3E (v3-17-10), still the same with USART1, then I just give it a try again with LPUART1 and it worked.

** As it seems after all these amnipulations, for sure the NUCLEO-F334R8 won't work...ya all know!!~

The lesson here is: try all, ST and MATLAB won't move a finger for something that should be "plug&play" as promoted.

Good luck.