Forgive me if this is obvious, but I didn't see anything in a search of the Forum. I code in "bare metal assembly", no OS, no C. I've got a J-link Plus (recent acquisition), and I'm working on a fairly complex application with the STM32F730Z8. I'm using the GCC toolset for assembly. So far I've been using the J-link to write flash, and the mem tool to peer into memory for debugging. I would like to use Ozone for debugging, but can't figure out how to link it to my source code. I am quite aware that it is a tool optimized for debugging with C-source, but it does also allow debugging in-line assembly, and supports the GCC assembler, so I have hopes that it will work in some fashion for assembly-only. Is there an ap note, instruction sheet, thread, or any other info to help me with this? Thanks for any help! Jeff Casey / Rockfield Research Inc. / Las Vegas, NV / casey@rockfieldresearch.com