topic Re: Single Stepping source code stops on wrong line in Kinetis Microcontrollers

Single Stepping source code stops on wrong line

Frank_Z — Sat, 11 Jun 2022 00:04:56 GMT

Running through my source code, I set a breakpoint, but when single stepping after the break the cursor is off three lines of code and stops on blank lines, comments.

Re: Single Stepping source code stops on wrong line

ErichStyger — Sat, 11 Jun 2022 13:45:25 GMT

Are you sure you have not modified your source files after having them compiled?

Erich

Re: Single Stepping source code stops on wrong line

Frank_Z — Sun, 12 Jun 2022 17:01:17 GMT

I modify the file either in Kinetis or my editor, save and press debug with auto build.

I have to "Build Project" to get compiled.

Re: Single Stepping source code stops on wrong line

bobpaddock — Mon, 13 Jun 2022 19:33:46 GMT

The compiler optimization level can cause that.

Setting optimization to -O0 to turn it off should fix that problem.

However then you are not truly debugging your production code, nor is it a good idea to run with optimization disabled. That can break some compile-time generated code, it can also cover up problems with missing volatiles or code-motion.

Re: Single Stepping source code stops on wrong line

Frank_Z — Mon, 13 Jun 2022 15:12:50 GMT

Not sure that's a solution or temporary bandaid.

Re: Single Stepping source code stops on wrong line

ErichStyger — Mon, 13 Jun 2022 16:44:42 GMT

Could you share a screenshot of what you are seeing?

Indeed, if you are using aggressive optimizations, then the compiler might move around code and remove things, so there is no clear indication between source code and generated code. But it should not point to empty lines, or at least I have never seen this. That the current source line jumps around, that is expected if high optimizations are enabled.

Re: Single Stepping source code stops on wrong line

Frank_Z — Mon, 13 Jun 2022 22:08:23 GMT

Apparently my auto-build setting in tripleDemod_Debug_Segger doesn't build the project. I have to do that manually, then debugging works fine.

Re: Single Stepping source code stops on wrong line

ErichStyger — Tue, 14 Jun 2022 06:19:29 GMT

I'm usually not using that feature, but I checked it on my side: it works as expected.

What I'm using otherwise is the global setting here:

Are you sure you used the correct launch configuration?