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Code is running well on STM32H755ZIQ board but not on a custom board

kavyamm
Associate II

‎2026-02-04 1:34 AM - last edited on ‎2026-02-04 1:45 AM by

Post moved from this thread.

@ STTwo-32

I am using the same STM32H755ZIQ board and facing the same issue where the target is not detected by ST-Link after uploading the program.
This is the code link: https://github.com/kavyammengineer/stm32debug/tree/main/led_on_off
The code works correctly on the Nucleo-H755ZIQ board, but when I upload it to my customized board, the target gets stuck and is no longer detected by ST-Link.
kavyamm_0-1770191263693.png
kavyamm_1-1770197296232.png
this is my sysclk 64Mhz 

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mƎALLEm
ST Employee

‎2026-02-04 1:44 AM

Hello,

@kavyamm wrote:

Post moved from this thread.

The code works correctly on the Nucleo-H755ZIQ board, but when I upload it to my customized board, the target gets stuck and is no longer detected by ST-Link.

Need to ensure you have the same hardware configuration of Nucleo-H755ZIQ on your custom board. So the first question comes here: what is the power configuration you have on your custom board? Direct SMPS? LDO? 

Nucleo-H755ZIQ board is Direct SMPS configuration by default. So if your board is not in direct SMPS by hardware, you've locked your MCU and you need to unlock ity.

Please read: How can I recover my STM32H7/STM32H7RS board after facing a power configuration deadlock?

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