F3 Discovery: what is slow red flash on LD2

[colinconstant]

Posted on February 04, 2015 at 10:01

Whenever my F3 Discovery board is powered by 5V (no USB) I get a slow red flash on LD2.  I can't find any info on what this means.  Maybe it just means there's power but no USB?

Thanks for your help, Colin

[Artur IWANICKI]

Posted on May 30, 2018 at 15:01

Hello,

Blinking LD2 means that there is no communication with PC, so your idea is right. Usually we see it once there is a problem with STLink driver.

Best Regards,

Artur

[AvaTar]

Posted on May 30, 2018 at 15:41

Then check your USB drivers on the PC, try the ST-Link Utility, and perhaps update to a newer (ST-Link) firmware.