Option `enable_semihosting` is not working

[caspermeijn]

Thank you for this great project. I have been using it as part of the Zephyr project and it works great.

I am using ARM semihosting for my printf statements and for each debug session I type monitor arm semihosting enable. After getting sick of doing that I wanted to enable semihosting by default for my board. When looking at the pyOCD options documentation, I got the feeling that I needed to create the following config file to enable arm semihosting.

# Set to True to handle semihosting requests. Also see the semihost_console_type option. Default is False.
enable_semihosting: True

However with this config file the semihosting breakpoints were still not parsed. So I tried pyocd gdbserver -O enable_semihosting=true, which also didn't work. After trying lots of variations I finally found the following working command: pyocd gdbserver --semihosting.

My conclusion was that the options parsing doesn't work correctly for enable_semihosting.

[flit]

Hi @caspermeijn, thanks for the report. I'll try to reproduce and fix.

In fact, I've been writing some detailed documentation for semihosting, so it would be nice if what's documented actually works!

[flit]

Turns out the problem is that the -S / --semihosting command line argument, whether set or not, always overrides the enable_semihosting option's initial value from -O or config file. Only if set later via arm semihosting enable or set option enable_semihosting=1 will it take effect. (This bug affects several other options, too.)

I won't be able to get to it right away, but it's on the list now. Thanks!

[caspermeijn]

Good to hear you found the underlaying issue. Don't hurry for me, as I have my workaround using the --semihosting argument. Thanks for the quick response.