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OMAPL138B-EP: USB0_DRVVBUS automatically switched to low

Part Number: OMAPL138B-EP
Other Parts Discussed in Thread: SYSBIOS

Hi,

I'm using OMAP l138. Project build on ARM with sysbios_6_76_03_01 and RTOS. The USB0_ID state is switched with GPIO. When I initialize USB0 as host (USB0_ID pulled to ground) , USB0_DRVVBUS switches to 1, Session bit also to 1 and 5V appears on port. But when I plug in usb flash, iterrupts 'DRVVBUS level change' and 'VBUS lessthen VBUS valid' appear  , USB0_DRVVBUS switches to 0  and and after usb_reset_event  SB0_DRVVBUS back to 1 , but then nothing happens.

Any help is really appreciated.

Best Regards
Dmitriy