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STM32L100RC Led2 Slow-Blinking

Nikolaos Apostolakis

Hello,

I am sorry to post here, but I have been searching for about 5 days and have found nothing for my problem.

I am developing a project on STM32L100RC and I want to connect to an ESP8266 Wifi Module.
However, when I connect ESP8266 Vcc Pin to STM32L100RC 3.3V, LED2 starts blinking slow and then I cannot download code to flash memory via Keil.

I have seen on User Manual:

LD2 COM: Tricolor LED (COM) advises on the communication status as follows:
Slow blinking Red LED/Off: At power on before USB initialization

Still can't understand what that means.

Thank you in advance,

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