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Bhavil
Graduate
June 22, 2024
Solved

Can not connect STM32G030 to CubeProgrammer

  • June 22, 2024
  • 2 replies
  • 3750 views

Hi,

I recently created a custom board based on STM32G030 IC and programmed it via UART to run my application. Now, I want to make some changes to my firmware, but I can not connect to the CubeProgrammer. I have tried connecting it via UART and ST-LINK. Below are the errors i get when I try to connect the board via different methods

via UART- "Error: Activating device: KO. Please, verify the boot mode configuration and check the serial port configuration. Reset your device then try again... "

via ST-Link- "Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication". The interesting thing here is that CubeProgrammer reads the board as a Nucleo-F303RE(I am using the ST-LINK from this board and have removed the necessary jumpers i.e on CN2)

I have tried to give 3.3V to pin 19(PA14) of the IC which is the Boot0 pin and restarting the board, but I am still not able to program the board. I can confirm that the IC is running the firmware which I uploaded as I can view it on one of my COM ports. How do I get the board back into programming mode? Even the SWD debugging is not working

Bhavil_0-1719049242418.png

 

    This topic has been closed for replies.
    Best answer by AScha.3

    Ok. 

    +

    > I would like to reprogram the board using UART

    Then you have to use the Boot pin , PA14/15 ; + pulldown (10k) ; + 100nF cap on NRST .

    + set nBOOT_SEL bit -> 0 (with swd connection -> option bytes )

    Then (after reset, with boot pin PA14 : high ) you get bootloader access on Rx/Tx .

    So you need : nrst, swd, swc, boot pin, and Rx, Tx ; 6 pins for this !

    -----

    If you just use st-link , swd, then : nrst, swd, swc ; 3 pins .

    And you can even the swd+swc pins use for other function, if dont need debug any more;

    still have access to swd with hard-reset/under reset , to flash/program/set option bytes .

    2 replies

    P
    Peter BENSCH
    Technical Moderator
    June 22, 2024

    Welcome @Bhavil, to the community!

    What does your ST-LINK look like? Please upload a photo of it, preferably front and back.

    Regards
    /Peter

    B
    BhavilAuthor
    Graduate
    June 23, 2024

    Hi Peter,

     

    Unfortunately I do not have the photo right now, I will upload the photo tomorrow. But if it helps, I am using the ST-LINK present on one of my Nucleo-F303RE boards.

    P
    Peter BENSCH
    Technical Moderator
    June 24, 2024

    @Bhavil I had overlooked the fact that you are using a NUCLEO, so a photo is no longer absolutely necessary.

    A
    AScha.3
    Super User
    June 22, 2024

    Hi,

    how you tried to connect ? (try: software reset )

    +

    show pic, what programmer shows ...

     

    B
    BhavilAuthor
    Graduate
    June 23, 2024

    Hey Ascha,

    I have tried to connect with the SWD pins via Normal mode and the hotplug mode but to no avail. I have tried both Hardware Reset and Software reset. I do not have the picture today, but I'll attach the pictures from the programmer tomorrow.

    A
    AScha.3
    Super User
    June 23, 2024

    Hi,

    just , for hard reset: is the NRST connected to the G030 ? + check its working , with scope ?

    +

    What about the Boot pin , PA14/15 ? What you set in option bytes ?

    -> Maybe only way to connect with st-link "under reset" , (hardware reset) .

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