Using Nucleo ST-LINK-V3 to debug external STM32

[alexpeach]

Greetings! A custom H523-based board has a 4-header connector [3.3V, SWDIO, SWCLK, GND] that I used with an external STLINK-V2 dongle connected to my laptop. Is it possible to debug this board using STLINK-V3 on my NUCLEO-U545RE-Q? Section 7.3 of the manual, Embedded STLINK-V3EC, does not mention this. Thanks.

[Richard Li]

You can use CN2, you can looking for schematics. 

[Richard Li]

Sorry, this board can’t use CN2.

[AScha.3]

Hi,

 

short: no.

long: this nucleo series with st-link V3 have debug connector, but just to connect external debug to the nucleo:

So you have to cut some connections and disable U545 nucleo cpu , to use the connector signals as debug of another cpu.

Possible - but probably not worth the effort, as a V3 miniE  or mods is just about 10 eu :

 

On the V3 mods you have to solder a connector or just some wires to connect to the [3.3V, SWDIO, SWCLK, GND] .

[Andrew Neil]

Section 7.3 of the manual, Embedded STLINK-V3EC, does not mention this

If it were possible, the manual would document how to do it.

The manual doesn’t mention it because it’s not possible*.

 

This is a change of direction from the original Nucleo - which did support using the built-in ST-Link to program/debug an external target.

However, that always came with some limitations & pitfalls - so I’ve always said it’s far better to just get a standalone STLink!

For example:

 

 

* Of course, it is possible by hacking the PCB - but, as ​@AScha.3 said, unlikely to be worth the effort.

[alexpeach]

Got it, thanks!