[grblHAL/STM32F4xx Issue#120] Failed to start GDB server (STM32 Nucleo-F446RE)

#1 – terjeio 于 2023-05-17

> Failed to start GDB server.

I get this message on my RPi 400 if I forget to power the target board or if the debug connection is not working.

> Other projects I wrote do work

With the same board? Is it a Nucleo-64? Are you downloading with Debug or Run – and are the selected configuration properties ok?

If you are not debugging you may try to flash the binary with the STM32 STLINK-Utility. I find this useful for checking the debug interface as well.

#2 – hemsta 于 2023-05-17

Yes, with the same board, it is a Nucleo-F446RE. Weirdly enough, when I run a different project first, it downloads onto the board without issue. If I then download the Grbl Driver project, get the “Failed to start GDB server” error and afterwards run my first project again, I now also get “Failed to start GDB server” for this project. So I somehow must be changing something about the GDB server.

#3 – terjeio 于 2023-05-17

Did you check the Debugger options ind the configuration against a working one?

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Click the down arrow in the tool you use for flashing:

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Then select “Run configurations…” or “Debug configurations…” to get at the list of the available configurations.

#4 – hemsta 于 2023-05-24

I tried that, the debugger settings are the same. But I noticed all projects say “Program does not exist” except for the GRBL Driver STM32F4xx Debug F446 Nucleo64 (I used the Release before). Building still works, but when I run the main I still get the error Failed to start GDB server. I get the warning : Invalid project path: Missing project folder or file: \GRBL Driver STM32F401\encoder for source path.
I think nothing changed.

#5 – hemsta 于 2023-05-24

To clarify, when I build and run it still says “0 errors, 0 warnings”. Then the window saying “Failed to start GDB server” pops up. And when I look at the “Problems” tab, it says the warning above “Invalid project path: Missing project folder or file: \GRBL Driver STM32F401\encoder for source path.”

#6 – terjeio 于 2023-05-24

There are a number of links found when I search for STM32 Failed to start GDB server, perhaps you can find some tips in those? I am afraid I am not able to help as I have never encountered this error and I have no idea where to start other than search the net or ask for help.

> Now I get the warning : Invalid project path: Missing project folder or file: \GRBL Driver STM32F401\encoder for source path.

My bad, I started implementing low level driver code for the encoder plugin a while back and I have not added the plugin to the github repo for this driver. If the binary is generated then you can ignore the warning, if not remove the encoder folder from the Source Location folders.:

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