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DrDro
DrDro
Associate III
October 30, 2023
Solved

Nucleo MB1364 as standalone ST-Link V3

  • October 30, 2023
  • 2 replies
  • 1987 views

Hi there,

I have developed my project long time with MB1364E, exactly with H723ZG.

Now I have got my own PCB with H743. I would like to use ST-Link V3 (SWD) from Nucleo board just the same as it works for cuttable ST-Link from L4 Nucleos, e.g.:
https://community.st.com/t5/stm32-mcus-boards-and-hardware/how-to-use-the-standalone-st-link-capability-of-my-nucleo-after/td-p/306461

I have removed JP4 "Idd measurement", JP2 "Power source selection" and JP5 "Power selection".

But it seems that Nucleo ST-Link is hardcoded to support only this board.
Log from CubeProgrammer:

 

 07:59:18:504 : UR connection mode is defined with the HWrst reset mode
 07:59:20:007 : ST-LINK SN : 003600453331510B33323639
 07:59:20:007 : ST-LINK FW : V3J12M3
 07:59:20:008 : Board : NUCLEO-H723ZG
 07:59:20:008 : Voltage : 3.29V
 07:59:20:008 : Error: ST-LINK error (DEV_TARGET_HELD_UNDER_RESET)
 07:59:20:024 : Disconnected

 

 However, when my PCB is not supplied I get another error from CubeProgrammer, the voltage is correctly 0.00V detected:

 

 08:03:06:200 : UR connection mode is defined with the HWrst reset mode
 08:03:06:234 : ST-LINK SN : 003600453331510B33323639
 08:03:06:234 : ST-LINK FW : V3J12M3
 08:03:06:235 : Board : NUCLEO-H723ZG
 08:03:06:235 : Voltage : 0.00V
 08:03:06:235 : Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication
 08:03:06:249 : Disconnected

 

Yes, I can still work with external ST-Link V3 and my board. But I also want to reuse part of not anymore used NUCLEO board.

Let's say, just to reduce garbage and save the world.
Is there a way to free the ST-Link V3 from NUCLEO board?

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

looking at the circuit (MB1364) , the H723 is fix connected to the st-link F723.

so no easy way to use it.

you could try cutting the connections swdio, swclk, swo (sb32) close to the H723 and use the CN5 pinheader to connect a cable.

but maybe it expect just a H723 as target...and refuses to work with other.

2 replies

AScha.3
AScha.3Best answer
Super User
October 30, 2023

looking at the circuit (MB1364) , the H723 is fix connected to the st-link F723.

so no easy way to use it.

you could try cutting the connections swdio, swclk, swo (sb32) close to the H723 and use the CN5 pinheader to connect a cable.

but maybe it expect just a H723 as target...and refuses to work with other.

"If you feel a post has answered your question, please click ""Accept as Solution""."
    Mike_ST
    Mike_ST
    Technical Moderator
    November 29, 2023

    >> but maybe it expect just a H723 as target...and refuses to work with other.

    I'm not aware about such a limitation, so far...

    Anyways, for that board, the use case is that you can only bring an external probe to debug the H723, but can't debug an external MCU with the on-board ST-Link V3.

    Maybe it is possible, but as you said, there is some work to do with cutter/soldering iron.

    In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. 
    F
    FBL
    Technical Moderator
    November 29, 2023

    Hello @DrDro 

    Check the user manual STM32H7 Nucleo-144 boards (MB1364) - User manual

    It should be helpful as well.

    To give better visibility on the answered topics, please click on "Best answer" on the reply which solved your issue or answered your question.Best regards,FBL
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