I can't program the MCU STM32L412KB

[Tommaso De Gennaro]

Hello,

I realized a custom board with a MCU STM32L412KBT6, whose schematic is attached, by using as reference the Nucleo-L412KB schematic.

The problem is that I cannot program the MCU, I am using a STLINK programmer mounted on the Nucleo F401RE (by disconnecting the jumpers on CN4 to disconnect the MCU STM32F401 on the board) and the tool STM32CubeProgrammer.

I also tried to reduce the frequency and change the mode in STM32CubeProgrammer but I obtain always " Error: No STM32 target found!".

The voltage detected in the tool is right (3.3V), the 3.3V is present also on the VDD pins e on the VDDA pin; the reset pin is to 3.3V and the BOOT0 is to 0V.

I tried also to change the MCU with a new but I obtain the same behavior.

At this point I ask you, could the STLINK be unsuitable for programming this low power micro?

Or what could be the problem?

Thanks in advance,

Tommaso

[Tesla DeLorean]

Check pin numbers and orientation

Check not a -P part

Should be workable with the NUCLEO

Target Not Found generally points to power or connectivity issues.

[Tommaso De Gennaro]

Hi,

thanks for answer me.

The part number is STM32L412KBT6, isn't present a P character.

What does the letter p stand for?

I check the orientation, It is correct.

I don't know what else to check.

[Tesla DeLorean]

The -P variants use SMPS not the LDO and typically have subtle but incompatible pin configurations.

Like this situation https://community.st.com/s/question/0D53W00002GvfTNSAZ/need-nanoedgeai-library-for-stm32l412rbt6-for-my-product

[Tommaso De Gennaro]

Hi, I think I have found the problem.

The resistive array footprint used for the SWD is wrong, so I had to fix some connections on the board.

Thanks for the support.

Tommaso​