Hello_world debug problem on nrf52840dk.

[nda]

Hello. I am new to Zephyr. I cann't debug Hello_world sample. As i understand it always reboots and does not go to main.

I am trying to use VS Code and nRF Connect SDK (1.7.0 also tried on 1.6.1 and 1.7.1). I watched all video tutorials "nRF Connect for VS Code". I did everything like in video. But it didnot help. I also did an experiment with virtual mashine. Install new empty windows 10 and  did everything like on video once more. Result is the same.

So i've installed all tools and SDK. Create a freestading application zephyr/samples/hello_world. Generate configuration with "enable debug options" for nrf52840dk_nrf52840. Open NRF terminal for DK. Flash the device. After flashing i can see in terminal:

If I am using Debug the program stops on msr BASEPRI, r0 and doesnot go to main.

  

In nrf terminal the string is blinking:

Like on video nRF Connect for VS Code, 5: Debugging -  i've tried to add 

CONFIG_DEBUG_OPTIMIZATIONS=y

CONFIG_DEBUG_THREAD_INFO=y 

to prj.conf. That also doesnot help. 

What to i do wrong? How can i get it work?

I've also tried another samples. For example - blinky. Debug also stops on the same instruction.  

[Marte Myrvold]

Hi,

Please try to not have "Enable debug options" selected when generating the build configuration. This option adds options to aid in debugging, including thread info, but it is not needed for simpler examples that do not use threads, such as the Hello World sample. There has been some issues where this option has affected debugging of samples where no threads are used.

Best regards,

Marte

[nda]

Thank you very much. Your advice helped. I didnt check  "Enable debug options" and debug session goes well. Why does it work in video tutorials with "Enable debug options"?

[Marte Myrvold]

Hi,

What version of cortex-debug do you have? This should have been fixed in cortex-debug 0.4.6.

Best regards,

Marte