What is the correct way to use a peripheral on both cores with HAL?

[TKuo.1]

I'm using NUCLEO-H755ZI-Q and I want to use USART3 on both M7 and M4 cores. The initializer is set to M7 as shown in the screenshot below. However, I can only get USART working on M7 but not on M4.

On the other hand, If I set the initializer to M4, then USART only works on M4 but not M7. It seems like HAL cannot work without an initializer. I would like to know the correct way to use HAL that can work on both cores. Thanks!

[FBL]

Hello @TKuo.1​ ,

I think this thread may help you!

STM32 Dual Core using peripherals (UART) with both cores - best practice?

[TKuo.1]

Thanks! I will take a look at it.