Dear ST Community, I am working on a project using STM32MP157D-DK1. I'm specifically working on interprocessor communication between the M4 and A7 cores.

[k44]

I followed the guide from the following ST's video: https://www.youtube.com/watch?v=PsiFDHH87vo&t=407s

In the guide, the A7 core is initiating the communication. I have been playing with the code to make M4 the one to initiate the communication, but still no luck.

Any guidance would greatly be appreciated.

[Olivier GALLIEN]

Hi @k44​ ,

reading " to make M4 the one to initiate the communication, but still no luck." I'm wondering if you are not facing limitation of RPMsg protocol which require a first message from A7 to M4, prior that M4 could send any message

see more detailed description here

https://community.st.com/s/question/0D53W00001FlDGTSA3/hi-iam-trying-to-send-data-from-m4-to-a7-using-ipccbut-iam-sending-from-m4-but-unable-to-receive-at-a7if-we-send-data-twice-then-iam-able-to-get-the-data-like-a-fifoif-you-could-please-help-me-in-resolving-this

Olivier