How to open semihosting window?

[sidprice]

I have added the “fast semihosting and profiler” option to my project but I don’t see any display of the semihosting output. I looked at the tutorials but the Debug Options I see does not have a drop-down to select enable/disable/auto. How can I turn on the display?

Thanks,

Sid

[support]

Hi,

Please double-check that your project is ARM-based and then check the Embedded Debug Tweaking page of VisualGDB Project Properties for the “ARM Semihosting” section. If it’s not shown, please attach  screenshots of the Embedded Debug Tweaking and MSBuild/Makefile Settings pages.

[sidprice]

Thank you, I was confused by the tutorial for semihosting and did not know the enable for it was on the Embedded Debug Tweaking TAB. I have that set to enable and the window now appears. However, I am not seeing any messages printed to the window.

I have selected the “Fast Semihosting and Embedded Profiler” framework, is there more I need to do?

Sid

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[support]

Hi,

Normally this should be sufficient. As a quick check, please try creating a new “LEDBlink” project, calling printf() from it and referencing the fast semihosting framework. If it does work, please recheck the differences between the test project and your original project.

Another option is to try setting a breakpoint in the WriteRawFastSemihostingData() function and stepping through it to see if s_FastSemihostingState gets modified properly.

[sidprice]

I created a new project and it also does not show any semihosting output.

https://github.com/sidprice/vgdb_semihosting_test

Sid

[support]

Hi,

Looks like you forgot the “\n” symbol at the end of the printed line. With the default settings, this will cause the C library to buffer the output internally until either a newline is sent, or fflush() is called explicitly.

As a workaround, please simply add “\n” at the end of the line you print.

[sidprice]

Embarrassing … thank you :o(

[support]

Hi,

No worries, small details like this one are very easy to miss.

[Author]

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