I'm having a simple problem with IAR Embedded Workbench, programming an STM32 using an ST-LINK/V2 programmer. I'm trying to run a program that temporarily switches off the JTAG pins, so I can't run it all the way through in debug mode. What I would like to do is load and run the program (without debugging), then connect the debugger to the running program to check a few values and make sure it actually ran.

I can't figure out how to do either of these steps with IAR. I've tried doing a "Download active application" followed by a "Debug without Downloading," but either the program didn't start running or when the debugger connected it reset the program. When I try to use the "Attach to Running Target" option, I get an error message saying "The debugging session could not be started."

Any ideas on how to do this?

  • \$\begingroup\$ This question appears to be off-topic because it is not about electronic design. \$\endgroup\$ Jul 1, 2013 at 16:14
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    \$\begingroup\$ This question is not too bad. It deals with usage of an IDE s/w, whose major users are EEs. Voting to leave open. \$\endgroup\$ Jul 1, 2013 at 16:40
  • \$\begingroup\$ No idea how to solve the problem under IAR, but with the open source stlink tool on github it's trivial to connect GDB over SWD to an already running target - but not very informative unless you have the .elf and debug symbols, which would probably require rebuilding your project with a GCC based toolchain. \$\endgroup\$ Jun 30, 2014 at 13:42

1 Answer 1


Old topic, no answer. For anyone who comes here, the solution is explained by IAR at THIS link.

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    \$\begingroup\$ Stack exchange sites require that answers have stand-alone value, not simply be links to something external. \$\endgroup\$ Oct 2, 2016 at 2:04
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    \$\begingroup\$ It will help people out anyways, specially because this question is kind of the first result popping out on google. \$\endgroup\$
    – Dumbo
    Oct 2, 2016 at 11:41

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