Bootloader

[FLYBYME]

What bootloader are you using? and are you flashing over USB?

[r-pv]

Hi, I'm using stlink, it's super convenient to me, so not using bootloader.

[FLYBYME]

Where did you get the chip pin number to the ping name.

In the datasheet says LQFP100 PC10=78 but your definition is PC10=1

https://www.mouser.com/datasheet/2/389/cd00191185-1796739.pdf

By the way thank you for the work you have done!!

[r-pv]

Yes, it's a bit of a mess the pin naming stuff.

PC10 it's the physical pin 78, but on the variant refers to the position 1 on the array PinName digitalPin (from the variant.cpp file), all the PCxx names are really an AKA of PC_xx names (all the PXxx and PX_xx pins), and this array it's where numerical pin names are based on.

Cheers!.