How to define a variable whose value survives a reset?

[Max]

I want to define a variable whose value can survives a reset. Is it possible?

[Moritz]

You can write to flash and get the written values back. That does the fds library for you. There are some examples around the forum.

[Wojtek]

If by reset you mean reset without power cycle, search the forum for "memory retention" keywords. There is plenty of topics about that. If you want to power-cycle, use non-volatile memory as @Moritz suggested.

[Alex]

If you are talking about variables not initialized by compiler on startup then in IAR for example __no_init uint32_t var; or In Keil

[Max]

I am not sure whether I should open a new question and will describe what my problem really is: I need to disable softdevice for my application to send a uninterrupted pulse trains on a general-purpose output pin. A sd_softdevice_disable() is issued before I send the pulse trains and sd_softdevice_enable(clock_source, NULL) is issued to re-enable softdevice. But I found that the chip seems to be reset. So my solution might be how to re-enable softdevice.

[Wojtek]

I don't think you need to disable sd to do that. just don't scan/advertise etc, and your program flow should go uninterrupted i think.