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[Q] Using USB Host API - cannot enumerate device

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http://forum.xda-developers.com – I am quite interested in usage USB host ability on my china no-name tablet based on Allwinner A13 CPU. I'd like to use it as GUI front-end for my embedded project with STM32F4 ARM microcotroller. So far I use laptop as the GUI for this device. STM32F4 is connected via USB as a vendor-specified device. I use WinUSB library on laptop to enumerate connected device and to open endpoints. I'd like to use tablet instead of PC. So I looked to the USB host API on Android and tried to enumerate devices. However I couldn't enumerate any device - includes mouse or flash drive, which works perfectly in (HowTos)