Restart system from QDEC_IRQHandler

[JIYEON]

Hi,

Time to time, Our board stuck in QDEC_IRQHandler.

1) In which case QDEC_IRQHandler could occurs?

2) I want system reset from QDEC_IRQHandler automatically.

But I can't find definition of QDEC_IRQHandler.

Please let me know where is QDEC_IRQHandler definition.

[Turbo J]

All undefined interrups use the same default handler, which is actually just an empty loop "b ." in assembly (check disassembly view).

Note that it is the same for all, and thus you likely mis-identiefied the handler. Read: The debugger may lie to you.

Check the active interrupt numer in IPSR.

[JIYEON]

What can I find in register1 window is APSR and XPSR. (That two are looks similar to IPSR)

ISR in XPSR is set to 16. How could I interpret it?

[Turbo J]

ISR 16 is the POWER_CLOCK_IRQHandler() on most NRF chips that I am aware of. Maybe you forgot to link a .c file in your project?

Is that with or without softdevice? The PC address is very low, so either without softdevice or your code overwrote the first 8 bytes that the boot loader needs to jump to your app code correctly.

[JIYEON]

Hello,

SW is based on ESB example. And There is no "Additional load file" in segger embedded studio option.

So, I think that project not includes soft device.

As your recommend, some files that include "power" or "clock" in name are added to project.

And It looks like problem is fixed.

It is wired to me. Because It was compile without any error before.

Why it fixed the problem? Could you help me to understand?

[Turbo J]

Most of the Power and clock functions are "static inline" and don't actually call a function in the .c file.

But the IRQ handler function is in those .c files. Since no other functions are actively used, it won't trigger a linker error when missing - and the IRQ is mapped to  the default handler.

Triggering an interrupt without the correct handler present will cause the program to hang in the empty default handler function.