如果找不到 STLINK

1. Open the Windows Device Manager window (Start button, right-click Computer, click Properties, Advanced System Settings, Hardware tab, click Device Manager).

2. With the STM32F4 Discovery board plugged in, find the ST-Link Dongle under Other Devices, and right-click it to display the context help menu.

3. Unplug the USB cable from the STM32F4 Discovery board.

4. Click Uninstall on the ST-Link Dongle context help menu.

5. Plug the USB cable back in the STM32F4 Discovery board. ST-Link Dongle should now display in the USB Controller section.

原来在 libusbK 下面，STLINK找不到目标
重装driver之后在 Universal Serial Bus devices 下面，可以成功连接

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