Using HSEM of STM32H7 ( sharing data )

[Toxicobull]

Hi,

I am working in project in which I use an STM32H745, So am trying to share data between the two CPUs.

first I create structure in the two CPU like this :

I used the same memory address

struct shared_data
{
	uint8_t drdyM4;
	float32_t data_to_M7[6][1024];
	float32_t data_from_M7[1024];
};
 
volatile struct shared_data * const data_ptr = (struct shared_data *)0x38001000;

This is working fine . I can share data.

Now I want to use HSEM to protect reading and writing process.

I have two question please :

1- How to use the HSEM ? is it what I should use for the interrupt between the two CPUs ?

2- Is my structure is protected from other code writing ( code can write on the same memory address) ?

Thank you

[TDK]

See the examples in CubeMX repository:

https://github.com/STMicroelectronics/STM32CubeH7/tree/ccb11556044540590ca6e45056e6b65cdca2deb2/Projects/STM32H747I-DISCO/Examples/HSEM

Your structure is not protected, but it doesn't need to be. You'll need to ensure the linker doesn't put other data there. This is part of the linker script.

[Toxicobull]

Thank you I solved the problem with the examples.

Could you tell me how to configure the linker to do so ?