Debugging Zephyr OS applications on NRF52832 with eclipse and openOCD

[StefanHri]

Hi,

I am trying to set up eclipse + gdb + openOCD for debugging zephyr 2.0.0. applications on nRF52832. Following the official Zephyr documentation build-and-run-an-application and setting my debug configurations in eclipse as shown in the next two figures I am able to debug a simple application consisting of a singe main function containing only few __asm("nop").

Unfortunately, when I try to debug the officially provided by zephyr ipsp example (contained in zephyrproject/zephyr/samples/bluetooth/ipsp) the debugging does not work properly. More precisely, when the debug session is started the program execution is not stopped at main() but on some other strange position. I guess, the program counter was not properly set for some reason, see the call stack in the next figure .

[StefanHri]

I have tried to use JlinkGDBServer also. I noticed similar effects. I can start the debug session (on the console I see that the image is downloaded) but after that the execution never comes to the main().

[Nguyen Hoan Hoang]

Have you checked the startup code as I suggested ?

[StefanHri]

No, because when I flash the board I can see with my phone that it advertises. This means that the image is OK. I think  it is some problem with the debugger initialization.

[Nguyen Hoan Hoang]

If that's the case then your entry point might not be main().  You can to find out in the startup code to see where it jumps to after reset.  Since Zephyr is a RTOS, it may bypass the main function. Other scenario could be that you have a miss match in debug info.