STM32L412: can't toggle PD2 on a custom board

VasuManiV · ‎2024-06-13

Hello,

Am working on STM32L412RBT6.

We made a custom PCB for our product and Am trying to PD2 as digital output as toggle function.

I can't able to find any high output at PD2. The pin PD2 is always remains low.

Please help me on this

SofLit · ‎2024-06-13

@VasuManiV wrote:

Yes @SofLit we have a nucleo board to evaluate our code. Even i have tested with that. Am getting low at that pin always. Even i have tried to make that pin high instead of toggling.

So here you confirm that even with NUCLEO-L412 board you're facing the same behavior? So I can test it from my side!

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VasuManiV · ‎2024-06-13

@SofLit Yes please do test and let me know

SofLit · ‎2024-06-13

Sorry, but NUCLEO-L412 has an LQFP32 package which doesn't have GPIOD port on it especially pin PD2, could you please clarify?

https://www.st.com/en/evaluation-tools/nucleo-l412kb.html

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VasuManiV · ‎2024-06-13

No its a LQFP64 package. Please check the snap which i took from the NUCLEO-412RB schematic

SofLit · ‎2024-06-13

Umm well unfortunately I don't have this board (NUCLEO-64) on hands but I can provide you a very simple project on which I toggle PD2 and you can test from your side and get back with the result.

But you didn't answer that question: do you confirm that even with NUCLEO-L412 board you're facing the same behavior?

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AScha.3 · ‎2024-06-13

But pin 54 is PB3 , not PD2 . Right ?

+

Which LED is there ?

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SofLit · ‎2024-06-13

Attached a simple project toggling PD2.

But also need to check the solder bridges SB16 and SB18:

SB16: needs to be soldered and SB18 needs to be disconnected.

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VasuManiV · ‎2024-06-13

There is not LED in NUCLEO board. We need a LED to blink to show fault status in our application.

VasuManiV · ‎2024-06-13

Sorry i forgot. Yes we are facing the same behavior in NUCLEO-L412RB board. As you can see that in schematic, PD2 is not going anywhere and it is coming directly to the connector. I have probed at the connector as well as in controller pin (54th).

SofLit · ‎2024-06-13

According to the datasheet pin 54 is PD2:

But in CubeMx if you create a project based on the NUCLEO-L412 board you get pin 54 is PB3! It's based on the default solder bridge SB18 soldered/SB16 disconnected:

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