Simple Multicore Core to Core Communication with STM32H7

JR1 · ‎2024-09-06

Hello Team,

how can a simple core to core communication on the STM32H7 be implemented? We want to exchange 2kByte of data in bidirectional way between CM7 and CM4.

Best regards,

Jochen

mƎALLEm · ‎2024-09-09

See this thread: https://community.st.com/t5/stm32cubeide-mcus/easiest-way-to-share-data-between-cores-in-stm32h745/td-p/576140

Or just create a shared memory region common to the two cores on each Core's linker. But you need to ensure at least two things:

- Synchronization of read and write operation between the two cores using HSEM to ensure the consistency of the data.

- Either to manage the data coherency from CM7 side when Cache is enabled or declare that region as Strongly-Ordered or Device (non cacheable) using MPU.

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mƎALLEm · ‎2024-09-06

Hello,

Please refer to the AN5617 STM32H745/755 and STM32H747/757 lines inter-processor communications

See also this article.

You can use OpenAMP to exchange data between two cores. Please refer to these examples in STM32CUbeH7 on github:

https://github.com/STMicroelectronics/STM32CubeH7/tree/master/Projects/STM32H747I-EVAL/Applications/OpenAMP

Hope I answered your question.

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JR1 · ‎2024-09-06

This example ist not working, we get compiler errors. Do you have a working example of the OpenAmp PingPong project?

mƎALLEm · ‎2024-09-06

@JR1 wrote:

This example ist not working, we get compiler errors. Do you have a working example of the OpenAmp PingPong project?

You need to give more details about that. What compiler you are using and what errors you are facing.

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JR1 · ‎2024-09-06

It seems that the directories are not complete, including the HAL libraries.

Could you try to download the Open AMP PingPong example and build it with the STM32 Cube IDE?

mƎALLEm · ‎2024-09-06

Please tell how did you download the example via github or from this page?

When you clone with git you, need to set the option recursive:

git clone --recursive

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JR1 · ‎2024-09-06

I have found the project in the FW_H7 directory.

Still I am facing problems with the integration in STM32 Cube IDE, see screenshots.

The projects CM4 and CM7 can be built, but there is no debug configuration available.

mƎALLEm · ‎2024-09-06

Sorry. Don't know about the CMake option.

What I asked you is to test the native project provided under C:\Users\<User name>\STM32Cube\Repository\STM32Cube_FW_H7_V1.11.2\Projects\STM32H745I-DISCO\Applications\OpenAMP\OpenAMP_PingPong

and open the CubeIDE project from here:

From my side I didn't have any errors during the compilations of CM4 & CM7 projects.

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JR1 · ‎2024-09-06

The code is running now on both cores. Is there any better documentation available than the readme.txt?

mƎALLEm · ‎2024-09-06

Please refer to the AN5617 STM32H745/755 and STM32H747/757 lines inter-processor communications

See also this article.

@JR1 ;

Already provided the documentation in my first answer.

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