I just bought a NUCLEO-H7S3L8 board and discovered that STLINK-V3EC on it refuses to connect using some USB-A to USB-C cables. It works fine with other similar cables from different vendors.
The problem appears to be with cables which provide the default 80uA current on both CC lines. These cables do not work. The ones which have only one CC line connected work fine.
The cables which do not work, never gave me any problems with any other USB-C device (e.g. with STLINK-V3MINIE).
I am not sure if having both CC lines powered is against the USB-C spec - it seem a bit of a grey area to me. But there seems to be quite a few cables doing it out there. For instance, I am quite sure that the CC lines were the reason for this user's problem with the same board:
https://community.st.com/t5/stm32-mcus-boards-and-hardware/nucleo-h7s3l8-is-not-detected/m-p/760442?search-action-id=88460536396&search-result-uid=760442
Could ST consider removing the error condition in this case from the STLINK-V3EC firmware?
