CODEWITHSUNDEEP
stm32usb-drivestm32f4discovery
Jason Yan
Jason Yan

Reputation: 33

PC cannot identify the ST-LINK

The development board is STM32F4DISCOVERY, which includes an ST-LINK embedded debug tool. Recently, my computer cannot identify the ST-LINK on it. The Device Manager shows that 'Unknown USB Device（Device Descniptor Request Failed)' with a yellow '!'.Besides, the LD1(LED) on the board change between Red and Green every 5s. Below is the SCH of the ST-LINK.

ps: I've already re-install the device driver, changed the micro-USB cable and even tried on another computer. Still not work. enter image description here

Upvotes: 0

Views: 3779

Answers (1)

denis krasutski
denis krasutski

Reputation: 637

I had similar behavior when I shorted-circuit on 5V (of course accidentally). Please check voltage on D1, on both sides must be 5V.

Also, if the voltage is OK, I would recommend testing board on another PC.

Upvotes: 1

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