sharing data between two cores of H7

[Jack_DB]

Title edited - originally said, "sharing data between two boards"

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Good day y'all,

I'm trying for the first time to have the two cores on a H7 board share data between one another on shared memory, in particular cm7 writing data and cm4 read it. 
From what I understand I need to use a semaphore to signal back and forth to alert the cm4 when there is new data in every iteration, the theory I get, but I'm not sure of the shared memory allocation and the semaphore correct availability. Is there any example code I can see to understand how it's supposed to go? I tried looking at the ide examples, but anytime I try to open the example folder the ide application just dies :\ 

Thx all for the advices, 

P.S. I'm also using FREERTOS but it's not supposed to cause any problem but you never know 

[TDK]

A few options:

STM32H7 Dual-Core: How to communicate between CM4 ... - STMicroelectronics Community

https://www.st.com/resource/en/application_note/dm00771441-stm32h745755-and-stm32h747757-lines-interprocessor-communications-stmicroelectronics.pdf

How to implement inter-processor communication in ... - STMicroelectronics Community

 

[Andrew Neil]

@Jack_DB Your title says, "sharing data between two boards", but you actually seem to be talking about sharing data between the cores in one chip - therefore on the same board ?

[Jack_DB]

Yeah sorry misspoke, I meant two cores... 

[Andrew Neil]

OK - title edited.

 

I think OpenAMP (Open Asymmetric Multi-Processing) is what you're looking for - see:

https://community.st.com/t5/forums/searchpage/tab/message?filter=location&q=openamp&location=category:knowledge-base&collapse_discussion=true

[mƎALLEm]

Almost the same question asked in this post: How can I bridge between two cores in STM32H745 to share data?

As you are using FreeRTOS, from the AN5617: the usage of stream buffer/message buffer in FreeRTOS context:

[Andrew Neil]

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@Jack_DB wrote:

P.S. I'm also using FREERTOS  

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So take a look what facilities FreeRTOS itself provides for inter-processor comms & multiple cores; eg,

Multicore advice and suggestions

Simple Multicore Core to Core Communication Using FreeRTOS Message Buffers