In STM32U5G7VJT6, GPIO Input Mode not working PA11 and PA12 pin

[Dharmendra_Singh]

Message:

I have configured PA11 and PA12 pins in input mode, but they are not responding — I’m continuously getting a low level from the MCU side.

For testing purposes, I configured the same pins as output, and they work fine in output mode.

To verify hardware, I removed the MCU and checked the lines — they remain high, confirming that the hardware is OK.

Please suggest the possible reason or solution at the earliest.

[mƎALLEm]

Hello @Dharmendra_Singh and welcome to the community,

PA11 and PA12 have bot the USB function. Are you sure you configured the GPIO in the right way?

I suggest to attach your project in the discussion in zip file.

[mƎALLEm]

@Dharmendra_Singh 

Did you really accept the solution?

[Dharmendra_Singh]

I have configured it correctly. I’m attaching the code for better understanding.

Please reply ASAP.

[mƎALLEm]

Hello,

In next time please don't mark the solution as it was not solved. If it was mistakenly done, you can unmark it using this arrow:

I don't have the MCU part number to test but I don't see an issue in the IO config. Did you put a pull up or pull down resistors on the hardware. I don't see you configured the internal ones

[mƎALLEm]

@Dharmendra_Singh why are you accepting as solution each time I post a comment?

[Issamos · Accepted solution]

Hello @Dharmendra_Singh 

I think what is special for the PA11 and PA12 of theSTM32U5G7 is mentioned on the paragraph 10.7.12 of the RM0456:

• PA11 and PA12 are used as standard GPIOs, set first the USV bit in the PWR_SVMCR register, then the USBPWREN and VDD11USBDIS bits in the PWR_VOSR register must be set prior to configure the GPIOs in a mode other than analog.

Same behavior reported and solved here.

Best Reagrds.

II

[Dharmendra_Singh]

Big Thanks, Working fine ....