Reboot when declaring object inside main method

[LeoSanta]

Hello every body.

I have created my own objects and when I was testing some configuration I realized about the following:

1. When I declare the objects outside the main method (as global) the program runs perfectly.

2. When I declare the objects inside the main method the microcontroller reboots. 

What could be the alternatives for this or how can I check what the reason of the reboot is?

[Einar Thorsrud]

Hi,

The first thing that comes to mind is a stack overflow issue. A global object is never on the stack, but when you declare it within a function it will be on the stack unless you make it static. So a simple way to see if this could be it is to make it static (by using the static keyword when you declare it) and see if the issue persists. If you are using the nRF Connect SDK you can also add a stack guard and check the debug log to see if that is it (CONFIG_MPU_STACK_GUARD). You can use CONFIG_MAIN_STACK_SIZE to increase the main stack size.

[LeoSanta]

The problem is exacly the stack. However, when I put the static keyword to the object inside the main method it does not compile the .cpp file even after I put CONFIG_CPP_STATIC_INIT_GNU=y at the config file.

[Einar Thorsrud]

How does it fail now? And did you try to simply increase the stack size? If you don't make progress, perhaps you can upload the failing project here along with instructions on how to build it so that I can have a look?