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AAAZO.1
AAAZO.1
Associate
May 3, 2022
Question

USART1 doesn't communicate using HSE; worked with HSI

  • May 3, 2022
  • 2 replies
  • 866 views

Hello, I am new to the ST platform.

I actually work with a nucleo144, and i was trying to work with bluetooth hc-06, the problem is that USART1 doesn't communicate with the board when I use HSE in the clock configuration, but it worked when I use HSI

In my project I can't use HSI, do you have any suggestions please ?

 

 

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2 replies

Peter BENSCH
Peter BENSCH
ST Technical Moderator
May 3, 2022

Welcome, @AAAZO.1​, to the community!

The HSE can only be used if:

  • either an external frequency is fed in (bypass mode)
  • or a crystal and the associated passive components (capacitors, depending on the board also 0-ohm resistors) are fitted. 

Does it answer your question?

Regards

/Peter

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Nikita91
Nikita91
Lead II
May 3, 2022

On a Nucleo board the HSE clock can come from the STLINK, if it is not populated with a crystal.

But you have to consult the schematics of the board, on some Nucleo there is a solder bridge to add for this functionality.

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