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J
JS8
Associate III
March 7, 2024
Question

ST-LINK/V2 LPUART Connection

  • March 7, 2024
  • 2 replies
  • 4481 views

I tried to set up a UART connection from my custom board to my PC but encountered some problems and after a bit of probing, it seems that UART TX and UART RX are connected to GND. Do I need to enable UART somewhere for the ST-LINK ? Also why do some drawings display pins 6 and 4 as GND but some of them display them as UART pins?

JS8_2-1709793600969.png

 

 

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2 replies

STTwo-32
STTwo-32
Technical Moderator
March 7, 2024

Hello @JS8 

If you look at the Table 4 of the UM1075, you can find the Pin description of the ST-LINK/V2:

STTwo32_0-1709794431657.png

As you can see here, there is not any mention for the USART.

If you are using the SWIM low-cost cable connections for ST-LINK/V2-ISOL, it is mentioned on the second note under table 3 that  "BOOT0, UART-TX and UART-RX are reserved for future developments."

STTwo32_1-1709794652654.png

Best Regards.

STTwo-32

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    TDK
    TDK
    Super User
    March 8, 2024

    This is a duplicate/continutation from the previous post:

    https://community.st.com/t5/stm32-mcus-products/st-link-v2-lpuart-connection/td-p/647622

     

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