Why do GP14 and PB15 GPIOS not work for me?

[FFran]

All other GPIOS work but these two do not. They get the same voltage as the rest (0 and 3.2V). All pins Vdd and Vss I have them well except pin 97 VDD_USB that by mistake I have connected to GND.

I have attached the project with which I have been testing all the GPIOs changing their allocation each time.

[waclawek.jan]

You mean PB14 and PB15? Those are OTG_HS_DP/DM. Can't this be related?

> VDD_USB that by mistake I have connected to GND.

JW

[FFran]

That's the only thing I can think of, but since I do not handle ARM ST very well, I want to ask if it's for another reason or if the error is due to VDD_USB

[waclawek.jan]

I don't know, but can't you correct the connection to find out yourself? Or try it on a "known good" board, such as one of the Nucleo boards?

JW

[AvaTar]

What board/hardware do you speak about ?

Nucleo and Discovery boards use to have several external components (RAM, LCD, sensors, etc.), tied to specific MCU GPIO pins. This uses to have a pull-up or pull-down "effect" on said pins, so check the schematics.

[FFran]

It is a hardware of its own. I have a USB stage just like the one with the DISCO hardware but I do not have any USB device connected...

[AvaTar]

And did you check the datasheet, perhaps that GPIOs have a special meaning to the MCU (like JTAG or BOOT). Can't see what MCU you speak about, and I don't download files/archives just for that.