We had a power issue with our custom board related to DFU updates. After performing a DFU we were seeing 8mA idle current, and when we had programmed the firmware directly with the JLink Flasher, we were seeing ~500µA as expected.
This lead us to believe that some GPIOs were not being reconfigured to the default values after a successful update. To test this theory we added a loop to the beginning of our app that sets all gpios back the their defaults. The result was a success, we now see ~500µA after a DFU update.
for (int i = 0 ; i <= 31; i++) nrf_gpio_cfg_default(i);
However, I wanted to create a question as a bug report. We expected that this would have happened at the end of a DFU update, and is not something that the app should need to worry about. We are still using SDK12.0.0 as there were a number of other bug fixes we had added in to the SDK, and we have not yet had tried to merge with SDK12.0.1.
Is this a known problem, and has it been fixed in the latest versions of the SDK?