Hello @Sindhu Vadde,
I recommend you referring to the STM32H7 Dual-Core: How to communicate between CM4 & CM7? article. It will help you getting started with the dual core communication on the STM32H7.
For more details, you can have a look at the STM32H745/755 and STM32H747/757 lines inter-processor communications application note.
It provides detailed description of the different inter-communication channels and presents the Cube Examples that you find under the "..\STM32Cube\Repository\STM32Cube_FW_H.XX\Projects\STM32H745I-DISCO\Applications" path.
Hope my answer helped you, when your question is answered please close this topic by marking it as Best, it will help other find that answer faster.
Chahinez
