Issue with Jumping to application from boot nrf52840

[Rup]

When in dfu mode (with usb dfu enabled) if we jump to application via "

nrf_bootloader_app_start" there seems to be an issue where the firmware locks up and doesn't start the application. If we software reset the chip, the firmware is able to jump to application without a problem.

 

Issue seems to be related to usb stack initialization. When we comment out the code that initializes the usb stack (

nrf_dfu_transports_init) then the code is able to jump to application without issue. 

Using sdk version 15.0.0

[Sigurd]

Hi,

Using sdk version 15.0.0

 There is a bug in SDK 15.0 when it comes to applying the USBD errata workarounds, see this and this post. Apply the fix, and check if it fixes your issue.