Call "change screen functions" in stm32h5xx_it file

[matheuschiarelli]

Hello, it is possible to call a function to change screens in a "stm32h5xx_it.c" file?

The goal here is redirect user to a different screen globally, with no need to do this in every screen individually. This function is called in "EXTI15_IRQHandler(void)" in the same file, which is a hardware button of mine.

[TDK]

Generally, calling blocking functions and other higher level functions shouldn't be done within an interrupt to avoid race conditions and functions that are not re-entrant safe. If you're in the middle of a display change and then this interrupt fires, my guess is it would break things.

Set a flag in the interrupt and change the screen in the main thread in response to this flag.

[GaetanGodart]

Hello @matheuschiarelli ,

If you want to change screen in code, you need to generate the functions for it.
If you create 2 screens and you add an interaction to switch from screen1 to screen2, TouchGFX Generator will generate the function for that in the screen1 cpp base file:

Then, you can call that function yourself.

But you need to know which screen you are in right now to be able to call the correct function with something like:

application().gotoScreen2ScreenNoTransition();

Regards,

[ferro]

>>"There is no way to go from any screen to screen 2"

@GaetanGodart Could you please clarify this? With, say, 5 screens, you can switch between any of them freely, right? I’m probably misunderstanding what you meant.

[GaetanGodart]

Yes, actually we can, let me change that.

[ferro]

Hi @matheuschiarelli 

there is

application().appSwitchScreen ( screenId );

in \touchgfx\framework\include\touchgfx\Application.hpp

This approach assumes that GoToYourScreen () is/are already present.

[matheuschiarelli]

Hello @GaetanGodart and @ferro 

Okay, i'm doing this at the moment. I was hoping to find a solution where i can call change screen functions outside touchgfx files, but if this isn't possible i will follow that way!

[ferro]

yes, what I suggest does exactly what you want

appSwitchScreen ()

EDIT: actually GotoScreen () are also avaialble 'from any application code' via access to Application () instance.

[GaetanGodart]

You can ask to change screen in whatever other file, just follow TDK's guideline.
You could change a variable when you want to change screen and read that variable in HandleTickFunction of the model.ccp file or you could use the RTOS (if you use one) semaphores/queue to call the function to change the screen.

Regards,