Arduino for STM32

I have NUCLEO-H743ZI2 and I need to use almost all pins of board both input and output. The problem is some of them are not working as intended.

Like if I set use following, the PH1 never gets HIGH

PinMode(PH1, OUTPUT);
digitalWrite(PH1, HIGH);

same goes for PC8 and PC9 as input, but they are always HIGH, never goes low


any idea how to make it work ?

maybe you'd need to check schematics etc to see if something is connected there.
PH0 and PH1 is your HSE crystal oscillator
PC14 and PC15 is your LSE 32 Khz crystal oscillator
check the specs
https://www.st.com/en/microcontrollers- ... 743zi.html

ag123 wrote: Tue Nov 16, 2021 7:42 am maybe you'd need to check schematics etc to see if something is connected there.
PH0 and PH1 is your HSE crystal oscillator
PC14 and PC15 is your LSE 32 Khz crystal oscillator
check the specs
https://www.st.com/en/microcontrollers- ... 743zi.html

PH1 is not connected to crystal, it should be but 25Mhz Crystal is not mounted soldered and nor its solder bridges.

Check for things like LEDs, pull up resistors etc, they tend to be 'littered' around boards and consuming gpios.

ag123 wrote: Tue Nov 16, 2021 12:00 pm Check for things like LEDs, pull up resistors etc, they tend to be 'littered' around boards and consuming gpios.

I checked the entire PCB as its open source, there is nothing attached to PH1

Those OSC pins can have artefacts, I'd guess, They normally have a not gate (transistor) there to work as an oscillator. It may help to check specs, app notes etc.

ag123 wrote: Tue Nov 16, 2021 12:12 pm Those OSC pins can have artefacts, I'd guess, They normally have a not gate (transistor) there to work as an oscillator. It may help to check specs, app notes etc.

okay I will avoid PH1 but what about PC8, PC9, PF14 not working as INPUT

Well which connector you used to test?
For PC8 and PC9 there are not connected by default to the Morpho connector as SB are DNF by default:

PF14 are available on the morpho but not on the CN10 A8 (as SB is DNF) A8 is PF6 by default.

fpiSTM wrote: Tue Nov 16, 2021 1:54 pm Well which connector you used to test?
For PC8 and PC9 there are not connected by default to the Morpho connector as SB are DNF by default:
PC8-9_H743.png

I'm using both CN11 and CN12. Yes you are right, PC8 and PC9 have SBs DNF by default. I was focused on PF14, I forgot to check these 2.

Thank you, it works now.

Edit :
About PF14, the problem was in hardware connection, its all good except PH1 cant be used as output.