Input pin in pull up mode is being in high impedance state

Vladyslav8989 · ‎2025-09-17

I have set PA3 pin as input with pull up mode. But testing this pin by multimeter I get high impendance state (0.5V) on it. Must be 3.3V (logical 1). I use stm32F417ZGT6.

Vladyslav8989 · ‎2025-09-18

I see... maybe... My mentor something about this possible necessity was mentioned too. But for this need to dismount resistor from pcb. For this need access to soldering iron. So, it's complicated. Maybe some other ways?

waclawek.jan · ‎2025-09-18

No.

Vladyslav8989 · ‎2025-09-18

I have removed one resistor and all works. Thanks!

Andrew Neil · ‎2025-09-18

@Vladyslav8989 wrote:
My mentor something about this possible necessity was mentioned too.

Time to go back to this Mentor again, then - and clarify that.

Maybe show them this thread?

BTW: Note that everyone can see every post - there's no need to repeat posts with the same information for different people.

You can mention multiple people in one post with '@'

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.