Strange things happen when FreeRTOS code is moved to a static lib

segev-amossi — Wed, 15 Jun 2022 14:29:53 GMT

Hi,

I'm using the EVK of MIMXRT1176.

I basically run an app that uses FreeRTOS. I run it on Core-M7 (it's a dual core).

The program basically does nothing, by the way, it only runs a task that prints "hello world".

When I run everything using a single project, everything works fine, but when I separate the FreeRTOS code to another static library - things get out of hand, and really strange bugs occur.

Just to get things straight - it's exactly the same code, only moved to a static lib.

Some of the strange things that happen -

1. The program halts , and I get a message saying "Break at address "0x0" with no debug information available, or outside of program code." (see the Bug_1 attachment).

2. Another thing that happens from time to time is that the program doesn't even launch, and from then on I can't even use the microcontroller anymore, since it identifies the current core as Core-M4 instead of Core-M7 (on every program I tried to run it on!). I have to use the Boot-Utility in and perform a Mass Erase in order to use it again.

When might cause such strange things? As I wrote earlier, I only switch the location from the App to a static lib.

Any help would be much appreciated,

Segev

Re: Strange things happen when FreeRTOS code is moved to a static lib

diego_charles — Wed, 22 Jun 2022 02:08:20 GMT

Hi @segev-amossi

I hope that you are doing excellent. I received the additional information you shared via email.

I suppose that your whole program may look like below and you have followed some procedure like described here How to create and use static library in MCUXpresso IDE

int main() { init_periph, pins etc. rtos_static_lib_enter();// problem appears when executing lib functions return 0; }

Are you able to share your project?

I think that we could take a look to :

Which section of memory is the static library is linked to.
Monitor program counter when jumping to static library functions.
Test linking whole application to SRAM, or link static library to SRAM using a linker script. Let me know if you need an example for this.

I mention this because I want to check if the static library is executing where we intend

All the best,

Diego.

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Strange things happen when FreeRTOS code is moved to a static lib

Re: Strange things happen when FreeRTOS code is moved to a static lib