STM32G071 PORTD Pullups

[KMill]

I'm connecting a 12-Way rotary switch to an STM32G071 as shown:

Board room is extremely limited, so I'm using the MCUs built in Pull Ups.

 

However when I read the lowest four bits of PORTD->IDR (for switch positions 7,8,9 and 10) it reads 0xA when it should read 0xF (The rotary is at position 1, so PORTD0:3 should all be pulled up).

Cube MX confirms PULL UP is enabled for all switch inputs:

The only other peripherals enabled on the chip are DAC output on PA4 and GPIO Output on PA15

I have carefully examined the board, and there are definitely no shorts to ground, and the switch it operating perfectly.

If I measure the voltage on all the PORTD0:3 pins, all are pulled up to 3.3v except PD0 and PD2, when they should be.

Any suggestions?

 

[Andrew Neil]

PORT D Read errors.

[KMill]

@Andrew Neil you'd think I would have remembered that!

[Andrew Neil]

Ha ha! I hadn't noticed that was also you!

[Ozone]

> Cube MX confirms PULL UP is enabled for all switch inputs:

But does the generated code really enable all pull-ups ?