STM32H755ZI-Q Nucleo programming succeeds, but the code does not work

[STM_for_beginners]

这是我烧录成功的画面，连接上stlink后板子的LD4是红绿交替闪烁的。烧录成功也是一样，板子没任何变化。程序是没有问题的。串口没任何输出。

This is the picture of my successful burning, and the LD4 of the board flashes red and green alternately after connecting to ST-Link. The same is true for successful burning, and there is no change in the board. There is no problem with the procedure. The serial port does not have any output.

Translated using Google Translate by Community team. 

[Andrew Neil]

So have you used the debugger to see what's happening inside the STM32?

https://www.youtube.com/playlist?list=PLnMKNibPkDnFCosVVv98U5dCulE6T3Iy8

[SofLit · Accepted solution]

Hello @STM_for_beginners ,

The issue is not clear.

But first, as you are using STM32H755ZI-Q Nucleo board, what is the power configuration you set in your application? SMPS or LDO?

If you set it to LDO, you've broken your board and you need to recover it. The board is hardwired in SMPS power config. Please review this thread: https://community.st.com/t5/stm32-mcus/how-can-i-recover-my-stm32h7-board-after-facing-a-power/ta-p/49579

[SofLit]

Hello @STM_for_beginners ,

Were you able to solve your issue and how?