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J
JunkgyuHan
Associate II
May 7, 2026
Question

NUCLEO-WB09KE board USUART -> LPUART change fail

  • May 7, 2026
  • 2 replies
  • 120 views

Dear ST team.

(related :Re: UART of NUCLEO-WB09KE UART signal no found - STMicroelectronics Community)

I am testing with NUCLEO-WB09KE EVB

Started from the example code ; "BLE_Peripheral_Lite", which is using PB0/PA1 as usuart port

I can see the Uart output signal on MB1801, CN3.37.

 

JunkgyuHan_0-1778140574863.png

949988ff-e84c-4790-a866-6bd2194b8b12.jpg

Then I manipulate to code to use LPUART; PB4/PB5 [attached code: BLE_Peripheral_Lite_LPUART1_PB4PB5.zip]

JunkgyuHan_1-1778140865069.png

But the result is, Uart output signal is still on MB1801, CN3.37(same PIN with USART).

Did I do something Wrong? or Missed something?

Please Help

 

2 replies

Andrew Neil
Andrew Neil
Super User
May 7, 2026

Just as an aside, you need to configure your terminal so that it starts a new line (ie, does both LF and CR) when it receives a LF.

Then you won't get the lines disappearing off to the right - as they are in your screenshot.

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
J
JunkgyuHanAuthor
Associate II
May 13, 2026

@Andrew Neil Thank you for advice but this is not what I expected.

the code is based on the original example code. I tried to minimize the modification

Andrew Neil
Andrew Neil
Super User
May 13, 2026

I was talking about your terminal configuration - not modifying the software.

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
Andrew Neil
Andrew Neil
Super User
May 13, 2026

Have you tried a simple, basic example which just does output to the LPUART on PB4 & PB5 - nothing else ?

I would suggest that you do that first, to prove that you have basic connectivity.

Once you have that working as a reference, then you can look at how to merge it into the BLE application.

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
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