Associate III

Question

STM32CubeProgrammer cannot connect to board using ST-LINK V3

Forum|Forum|2 years ago
September 26, 2024
24 replies
9786 views

Hi, I get the below error when trying to connect to my B-U585I-IOT02A board in "Hot plug" and "Hardware reset" modes, whatever is the frequency. I get the same error even with BOOT0 High.

I'm using STM32Cube Programmer v2.17.0

Connection is successful only when I keep on pressing the reset button, but there is no option byte set and any attempt to set option bytes fails.

Thanks in advance for your support.

STM32CubeProgrammer

This topic has been closed for replies.

AScha.3

Super User

Hi,

try with these settings:

SWD...software reset, debug in low power mode..

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S

SedCoreAuthor

Associate III

Still this error:

AScha.3

Super User

Hmmm...

Was it working before ?

Did you set some protection or debug authent. ?

Power consumption ...normal ? Gets something hot ?

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S

SedCoreAuthor

Associate III

Whether BOOT0 is high or low, the behavior is the same, I have to keep the reset button pressed down.

Could it be that the STM32U5 is continuously resetting?

TDK

That's a strong possibility. Here are other things that would cause what you're seeing:

Chip constantly resetting (NRST going low).
Chip performs FLASH operation immediately on startup.
Chip goes into low-power mode.
Chip re-initializes the SWD pins.

Booting into the bootloader will prevent any of these from happening, but of course you need a way to actually do that.

"If you feel a post has answered your question, please click ""Accept as Solution""."

S

SedCoreAuthor

Associate III

Ok, I see. But yet the problem is about being able to boot into the bootloader. I don't have idea on how to do so.

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