stm32l-discovery weird blinking on LD1

[vicki19880929]

Posted on March 12, 2014 at 23:46

Hi all,

I have a question regarding to LD1 COM LED of STM32L Discovery board.From 

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/user_manual/DM00027954.pdf

, it mentioned LD1 COM turns green to indicate that communications are in progress between the PC and the ST-LINK/V2.  And normally it should be a red as default status.  However, what does the blinking red indicate?With the same code, I saw this situation sometimes, but sometimes it just works fine.  I always need to plug and unplug my USB cable until it functions normally......  Does anyone have any idea?  

Could it be caused by the insufficient current of my USB hub? Otherwise I couldn't think of a reasonable answer.

Thanks,

Shan

[Tesla DeLorean]

Posted on March 13, 2014 at 02:20

So power the board with a bench supply, and see if that helps. Roll-back the firmware on the ST-LINK if you updated it prior to the issue. Or try a different board

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