Very silly problem (STM32F746G discovery board)

[DevOne]

Hi everyone,

I just picked up a STM32F746G discovery board to practice on, but I can't for the life of me get the built-in STLink to show in windows. By this I mean, I'm unable to power via mini-B and LD7 just flashes red. Once I change the jumper on JP1 to power via USB HS I can power the board on. But even then I can't detect the STLink connection. I've tried updating, downgrading, removing, reinstalling the stlink drivers (link004, link007 and link009) to no avail. Has anyone else had this issue?

[DevOne]

Oh! Let me also add.... I did try a different cable and different power sources (USB ports on hub, motherboard and second PC)

[Imen.D]

Hello @DevOne ,

What message error you have?

Try using STM32CubeProgrammer and connecting the board with hardware reset and 'under reset' mode.

[DevOne]

From STLink it's literally "No ST-Link detected", and the same equivalent message from STM32CubeProgrammer et al

[Lloyd1968]

I had the same problem. I changed from a 1 foot USB cable to a 3 foot USB cable, and the software was able to detect the NUCLEO-F439ZI board that I have. There was firmware update on the board, so I thought that it might fix the problem I went back to the 1 foot USB cable, but the software could not detect the board. With the 1 foot USB cable, the red light flashes. When I use the 3 foot USB cable, the red light is solid. I hope this helps.

[AScha.3]

Hi,

What system you use ? (Win10/64 ?)

+ use direct cable to usb on PC , no hub !

+ Is board new and 100% not damaged ?

+ When connect USB plug, can you hear the "ding-dong" sound?

If nothing at all - try other USB cable ( and proof, its not only a charger cable).

[DevOne]

Let me try this. The other suggestions I've already done (as mentioned in the first posts). The issue is "STLink not detected", so changing reset settings wouldn't work. I ordered a longer cable (1m) as the ones I've tried are all quite short.

[Lloyd1968 · Accepted solution]

Hello,

To answer your questions:

Direct PC connection, no hub.

It is a new board and it is working fine now.

There was no ding-dong.

I tried another cable (1 foot) and my STM32 board worked fine. The cable in question is probably a charging cable and not a full USB cable. It has USB symbol + B on the end with micro USB connector and a normal USB symbol on USB-A side. I did not realize that I had a USB charging cable in my mix of different USB cables. Hopefully, someone will not make the same mistake that I did.