Hey everyone,
I have an odd problem with a STM32H563VGT6.
I have configured several GPIO as inputs with no pull-up/ no pull-down. The pins are wired to an external 10k pull-down and a DIP-Switch which is directly connected to +3V3. (screenshot below).
When all switches are off, I read and measure +0V on my pins. If I set one switch to active so it connects +3V3 to the MCU-Pin this pin reads a high and I can measure +3V3 with an osciloscope. The weird thing is now that I can also measure something between +1.7V and 2.9V on the other lanes, even though thex should be low and pulled down by the 10k resitor. I tried to work with the internal pull down of the mcu with the same results. I tried to configure 3 of the pins to output and set them to low. The remaining pin was set as input. After I switched the respective switch to high I got the same result and even the pins which should drive the lanes active low got some voltage somewhere between 1.7V and 2.3V.
I work on a custom board but all other functions like DAC, ADC, USART work fine and I have never had the situation that GPIO was an issue. I have already checked the bare PCB without parts for possible wrong connections between GND and 3V3 or any wrong or missing connections in the area of the DIP-switch. Seems alright and values and open lines are what I would expect.
I have already seen in the documentation that there is an SMPS versions of my MCU but from everything I can see and from everything that is printed on the MCU it should be the STM32H563VGT6 and the PCB layout matches to this controller.
I configured with CubeMX Version 6.13 and worked with CubeIDE Versions 1.16 and 1.17. Maybe there are some known issues somewhere that I missed?
Thanks in advance for any help
