How to control setting the option bytes using cube ide ?

[KnarfB]

Use STM32CubeProgrammer for that.

[Oliver R.]

Thank you for the quick reply, highly appreciated.

Unfortunately there is a misunderstanding, due to my briefness in asking.

I dont't really want to set the option bytes. I want to AVOID them to be set.

Cube ide somehow does something strange here, which I want to understand and control:

When I use cube ide and start debugging, my device gets locked,

and is then not programmable/debuggable any more, unless I set BOOT0 low.

So, I need to find what is happening in cube ide.

(I am a beginner with cube ide - with the curent 1.3.0 version things start to be usable,

but in the past I had too much trouble, so I never really used it before).

[Oliver R.]

My investigation so far shows that my problem is related to the

__HAL_AFIO_REMAP_SWJ_DISABLE();

call, which is generated by cube ide.

I found some other discussion in www about this.

I continue investigating ...

[KnarfB]

When BOOT0 is not low, the chip will boot from internal system memory (ROM) and listen on some interfaces for a boot loader. This feature is ment for firmware upgrade in the field, but not for debugging. Some chips have a option bit in flash for turing that BOOT0 pin behaviour off.

But AFAIK STM32CubeIDE does never mess with option bytes. Use STM32CubeProgrammer for option bytes inspection.

hth

KnarfB

[Oliver R. · Accepted solution]

OK, I found:

I need to set the GPIO's of my target uc in cube IDE (the cube MX part) to the debugger pins.

Then the

__HAL_AFIO_REMAP_SWJ_DISABLE();

is replaced by

__HAL_AFIO_REMAP_SWJ_ENABLE();

The deubgger still does not work in Cube IDE, but it works on the same environment flawlessly with Ozone.

So now I use Cube Ide for compiling and flashing, and Ozone for debugging.

That works for now.

[Oliver R.]

Again thanks for the quick response and paying attention to this.

Sorry my mistake, I mean: "set Boot0 High".

I found what was going on by debugging and then stepping over the

__HAL_AFIO_REMAP_SWJ_DISABLE();

instruction, where the debugger said good bye.

And from here:

https://medium.com/@LargeCardinal/how-to-bypass-debug-disabling-and-crp-on-stm32f103-7116e7abb546

and here:

https://community.st.com/s/question/0D50X00009XkdjtSAB/bug-cubemx-switch-off-jtag-and-swd

I figured it out.

I posted my solution.