[STM32] Global GPIO Reset at startup breaks debugger connection

[CBazille]

Description of defect

For STM32L433CC device on custom board, and possibly for all STM32 devices, call to GPIO_Full_Init(); added in in mbed_overrides.c leads to all GPIOs being reset, including SWD pins. This leads to the debugger losing connection to the target, leading in turn to a SIGTRAP. Target is not affected by the loss of debugger and enters main correctly.

Target(s) affected by this defect ?

STM32L433CC on custom board, but probably all targets where SWD pins are configurable as GPIOs.

Toolchain(s) (name and version) displaying this defect ?

ARM GCC 8.1.0
GNU GDB 8.1

What version of Mbed-os are you using (tag or sha) ?

mbed-os-6.6.0

What version(s) of tools are you using. List all that apply (E.g. mbed-cli)

mbed-cli 1.10.4

How is this defect reproduced ?

Create new mbed program, compile and start debug session. Connection to target should be lost with SIGTRAP.

[Copper-Bot]

Hello,

A pull request is already open to fix this issue: #14032

[0xc0170]

As it was merged, I close this as resolved. If it does not fix your issue, please update the issue.