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F3 Discovery: what is slow red flash on LD2

colinconstant
Associate II
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
2 REPLIES 2
Artur IWANICKI
ST Employee
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
Lead
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.