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WFI instruction stops debugger

Question asked by SCOTT MILLER on Mar 21, 2016
Latest reply on Jan 10, 2017 by Thomas Edel

I'm using an MK02FN64VLF10 with KDS, porting an application from an HCS08.  I've used the WFI instruction in place of the HCS08's WAIT instruction to pause a loop while waiting for a periodic interrupt.  It works fine, but when I'm using the debugger the WFI instruction causes it to stop with a "suspended : signal : SIGTRAP : Trace/breakpoint trap" message.  After that it seems to keep running but the debugger is disconnected.  My debug connection is via SWD to a P&E Multilink Universal.


It's just a nuisance at this point, but I can't find any information on whether this is the expected behavior and the best way to avoid it.  I can just exclude the WFI instruction in the debug build, but then it's a less accurate representation of the system's actual behavior.  Is there another way around this?