RE: nrf52840 hitting unknown breakpoints

SwitchGM — Thu, 23 Oct 2025 11:41:46 GMT

Hey Vidar,

Thank you very much for the response!

Surprisingly, I'm no longer experiencing the break point issue.

I'm not sure why this no longer occurs, but I will update the ticket with any information I find 🙂

Thank you for the help. (processor core registers was new to me and a very interesting read!)

Kind regards,

Joe

RE: nrf52840 hitting unknown breakpoints

Vidar Berg — Wed, 22 Oct 2025 12:16:33 GMT

Hello Joe,

Unfortunately, I don't have experience with this framework or debugger and I'm afraid I don't have an explanation for why this breakpoint is set either. But it's interesting that it appears to be set at a RAM address. Most applications don't execute code from RAM.

Can you run the 'reg' command after the breakpoint has been hit and check which address register r14/lr points to (https://developer.arm.com/documentation/ddi0439/b/Programmers-Model/Processor-core-register-summary). You can use addr2line from the command line to look up the LR address in your .elf/.out file (assuming this is included in your build output).

Best regards,

Vidar