Programmatically disabling PINRESET - nRF52832, nRF5 SDK, SD112

RE: Programmatically disabling PINRESET - nRF52832, nRF5 SDK, SD112

hmolesworth — Sat, 14 Feb 2026 23:47:04 GMT

Not sure if this helps, but it would be usual to make the reversion of the PINRESET in the App conditional on the version of the Bootloader; in other words the main App only turns off the pin reset (which requires a reset to load the new UICR) once the new bootloader has been installed and is invoking the main App. This requires that the new main App query the version of the bootloader.

Edit: I forgot to mention that it may be possible to simply enable the pull-up on pin 21 to reduce EMC susceptibility. This works (may work) as the schematic in the data sheet is incorrect; the pull-up applies to the pin regardless of what mode the pin is in.

RE: Programmatically disabling PINRESET - nRF52832, nRF5 SDK, SD112

eyalasko — Sat, 14 Feb 2026 22:14:06 GMT

So it appears that the problem lies in the bootloader of the older version.

Since it was build with CONFIG_GPIO_AS_PINRESET, it enables PINRESET and then transfers control to the app that tries to disable it and then reset, hence creating a boot loop.

I would appreciate a clear instruction as how to OTA update a merged Bootloader+App file.

If this is not possible in one step, please guide how to do it in two steps.

I tried to rebuild the bootloader without the flag and generated a DFU zip file which I managed to DFU fine, then I'm trying to DFU the app, the device resets...

Please advise