STM32H735G-DK STLINK no STLINK USB enumeration.

[BKrak.1]

Hi,

I just bought STM32H735G-DK and USB is not working out of the box.

I have put jumper on STLK but device is not getting detected on PC(LD6 red/green dim lit).

There are no new devices in device manager when plugged in.

Board is running original program just fine, power on and all.

Am I missing something? Is there something I can do?

Best regards

[Uwe Bonnes]

Check that you use the right usb connector. Check cable, check usb port. Check that you did not keep the stlink under reset by some jumper.

[BKrak.1]

Tried two PC-s.

Connector is cn15. Tried 3 cables no luck.

Jp3 is open.

only JP1 and STLK jumper are closed.

[TDK]

> LD6 red/green dim lit

What does this mean? They're both lit (so yellow?) but only dimly?

[BKrak.1]

They are lit but like being lit with pull-up/pull-down resistor so you can barely see that it is lit

[Uwe Bonnes]

Start measuring the voltages at the different jumpers in the supply path. Expect e.g. a broken or cold solder USB connector pin.

[BKrak.1]

Thank you guys it looks like the cable was bad or only for powering devices.

4th cable worked. incredible

[TDK]

If you have 3 bad USB cables it may be time to reevaluate purchasing decisions.

[BKrak.1]

Usually I make my own PCBs and use JLink for debuging/programing.

I bought this one to learn a little bit about ST, because I use NXP, Freescale, Atmel but want to switch to ST because they have enough memory embedded.

[TDK]

I meant more on the USB cable side. If I get 3 of something and none of them work, I would not be happy. Didn't mean anything else by it.