Cannot connect to STM32G0B1 custom board

[degaus]

Hello everyone,

I have designed a custom board with the STM32G0B1CET6N but I cannot connect to the nucleo st-link programmer.

I have removed the two jumpers from the nucleo board but when connecting to the board it doesn't get recognised by the ST-Link Utility or STM32Programmer.

I do get an issue with the driver on the Device Manager but when I connect it to another custom board it works fine.

Below is the schematic for my custom board.

Any help is really appreciated.

 

Matteo

 

[MM..1]

VDDIO2 and VSS on your must be connected too. 

[degaus]

Hello MM..1,

 

Thank you for your prompt reply!

Yes, I did noticed that mistake and I have put a temporary cable with the decoupling capacitors. Unfortunately it doesn't seem to work still. I will check that connection again in case there is a bad soldering.

[Pavel A.]

Please do yourself a favor. Get a new (and cheap)  ST-LINKv3 instead of hacking a nucleo.

[Tesla DeLorean]

If it fails so bad the ST-LINK drivers can't find it, you'd need to look at the circuit, for shorts, powering issues, etc.

Check part / connector orientations.

[degaus]

Hi Pavel,

 

Thank you for your reply, I am not actually hacking a nucleo, I am only using the built in st-link to try to program my custom board. I have actually a ST-LinkV3, but I have the same issue.

I am trying to understand what else I am missing, on top of the two connections that MM..1 has nicely pointed out.

 

Matteo

[Pavel A.]

A normal ST-Link at least won't have issues with USB connection to host.

[degaus]

Hi MM..1,

 

Thanks for the reply.

The link is working as normal with jumpers on, also it is working fine with jumpers off on another custom board (L010 chip). I have attached the picture with the jumpers off. I think I need to get a new board done with the VDDIO2 and VSS connected properly as the flying wire maybe are not connected properly. The board was factory assembled so I assume that is right.

BTW....I am new on STM32 so forgive me for silly mistakes.

Matteo

[MM..1]

For normal use you require three pins connected GND SWCLK SWDIO and on your image GND isnt connected
plus custom board power ...

[degaus]

Hi MM..1,

 

Thanks again for your help.

 

I have connected as your suggestion and now I do get a different error.

Need more investigation...I may get the board re-done with the VDDIO2 and VSS connected this time, just to make sure that the flying wires are not connected properly.

PS. Could you please let me know if I missed something else from schematic?

Thanks again.

Matteo

 

[Pavel A.]

> I am new on STM32 so forgive me for silly mistakes.

Desire of using ST-link of other ST board instead of a normal modern ST-link v3 (high speed, VCP) is one of these mistakes IMHO. Just doubles chance of damage and confusion, for nothing good.