SDKv15.2.0 Problem With nrf_dfu_app_is_valid()

RE: SDKv15.2.0 Problem With nrf_dfu_app_is_valid()

Vidar Berg — Tue, 23 Oct 2018 07:16:01 GMT

Hi Warren,

I see. Glad you found the problem, issues like these can be difficult to debug.

RE: SDKv15.2.0 Problem With nrf_dfu_app_is_valid()

wc4765 — Mon, 22 Oct 2018 14:06:02 GMT

Hi Vidar,

Thanks for the reply and clarification. I wondered if that was the intended behavior.

My use case was built with NRF_DFU_DEBUG_VERSION and had no valid application present when I was testing and caused this issue for me.

Thanks again,

Warren

RE: SDKv15.2.0 Problem With nrf_dfu_app_is_valid()

Vidar Berg — Mon, 22 Oct 2018 07:33:46 GMT

Hi,

Yes, it is correct that it should return false. However, this is actually intended behavior - the debug version of the bootloader will ignore CRC mismatch in order to simplify debugging during development . E.g. you don't have to update the CRC value in bootloader settings every time you re-compile the application code. The release version (built without NRF_DFU_DEBUG_VERSION) will set NRF_DFU_DEBUG to "false" and therefore return false in case the CRC is invalid.