STM32 NUCLEO-H503RB MB1814B STLINK Connection Problem

[TKana.1]

Hi,

Anyone having problem connecting STLINK on NUCLEO-H503RB board?

I have two boards not showing up in device manager (both W10 and W11 PCs). Tried different PCs, cables and result is the same: LD7 LED is not lit, LD1 red lit, green pulsing, LD3 not lit.

If I reset STLINK via JP1 jumper, shows up in device manager as STLINK V3 and in DFU mode in CUBE Prog (v2.17.0). I can update their firmware but after update, they disappear again from device manager and CUBE Prog.

I can access and program the target H503RB MCU with an external STLINK debugger.

Jumers on boards are at default positions and I tried other options, too. Tried connecting both target MCU and STLINK USBC ports at the same time, no luck.

Any pointers?

Thanks,

Tim

[TKana.1]

I think I found a workaround by accident:

- Connect USB cable at PC side

- Insert connector to STLINK USB port slowly, like 1mm/second. As soon as LD1 lits red, quickly insert the connector fully: It works. Can connect and debug normally.

Seemed firmware issue to me. Like need power before communicating to Windows.

So I tried versions:

- V3J10M3

- V3J13M4

- V3J15M6

- V3J15M7

All the same.

With this workaround, any reset to STLINK requires same work again

Tim

[TKana.1]

I have a video for the workaround. But I don't have permission to upload video

Tim