STM32 NUCLEO-H743ZI2 UART Baud rate mismatch problem

[Chaotic]

Currently i am working with nucleo-h743zi2 board. I set the Baud rate in CubeMx to 115200. In the Hercules program, when I set the baud rate to 115200, the data does not flow correctly, but when I set the baud rate to 38400, it flows correctly. Why might this problem occur? My CubeMx settings can also be seen in the photo.

[mƎALLEm]

Hello,

Could you please share a minimal project that reproducers the issue?

Are you using USART3 and STLINK Virtual comport?

[Chaotic]

I solved the problem. I was using HSE as clock. When I looked at the UART documentation for this card, I saw that clocks such as HSI, LSE should be used instead of HSE. Indeed, when I changed the HSE, the problem disappeared and communication took place smoothly with the same baudrate on the transmitter and receiver sides. If anyone knows a way to use HSE here, please let me know.

[mƎALLEm]

Hello,

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When I looked at the UART documentation for this card, I saw that clocks such as HSI, LSE should be used instead of HSE. 

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Where did you find this information? could you please share screenshot of that? because this doesn't make sense!

[Chaotic]

You can find it in the document in ST website which name is "STM32H7-Peripheral-USART interface (USART)". Write it google you will find this document. I attached the photo of the part where I solved my own problem.

 

 

[Chaotic]

Before the problem is solved, i chose the HSE from the clock configuration in CubeMX. After i read the documentation, i chose the HSI clock and my problem is solved. Uart receiver and transmitter is working fine now. I dont change anything except this.

[mƎALLEm]

Could you please share your ioc file where you selected HSE as clock source?