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How to detect on-board USB-stick

Question asked by Calvin63 on Oct 14, 2015
Dear Sir:

   How to detect plug in behavior for USB-stick in FW? My project implement a USB MSC host. If USB-stick is on board before power on, the FW can't detect it. I must plug it out and plug in, FW will now detect and begin USB emulation... What function I can call so it can check USB-stick on board before power on? By the way the library I use is STM32_USB-Host-Device_Lib_V2.1.0, the chip is STM32F427.