How to use the watchdog when DFU

[roy756456625]

Hi

I opened the Watchdog in the user application,and do nothing in the bootloader.Then when I use DFU,the CPU reset appears.How can I to deal with it?

And when I upgrade willful termination APP(nRF Toolbox),the CPU(nRF52832)is down,and can't work.Do you have any suggestions on how to solve this fault tolerance?

Thank you!

[bjorn-spockeli]

You'll have to "feed" the watchdog in the bootloader, i.e. call

NRF_WDT->RR[0] = 0x6E524635UL;

in order to prevent the watchdog timer from timing out and resetting the chip.

-Bjørn

[Jarmo]

In this case it is nRF51 and SDK8, so no secure bootloader. So, what would be the best way with it? Since all our applications do not use watchdog, but all are using the same bootloader, I would need a safe way to bypass watchdog in the bootloader if it is not running. In other words, if an application has not started watchdog, bootloader should not use it, neither. How to achieve that? We definitely do not want to have two different versions of DFU-OTA bootloader.