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stm32l-discovery weird blinking on LD1

Question asked by shan on Mar 12, 2014
Latest reply on Mar 13, 2014 by Clive One
Hi all,

Does anyone know what COM (LD1) LED on top of the STM32L-discovery board indicate??? I know that when we upload the code, it will blink in red and green very fast, and when it's powered on and work normally it will be red (no blink).  

However, what does the blinking red light 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 about the COM LED (LD1)?

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