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MSP430F5502 USB issue

Other Parts Discussed in Thread: MSP430F5502

I am developing a pedometer based on MSP430F5502 and now run into an USB issue . Here is details :

Enumeration : The USB is enumerated as HID device and PC applcation tries to exchange data with it via EP1 .

OS : Windows XP +SP4

Issue description :

I frequently unplug/plug USB several times (indefinite . Sometimes up to 30 mins,)and then there might be an issue : the pedometer can be enumerated successfully while PC application fails to transfer data to USB device. Further re-unplug/unplug fails to make USB recover.

Analysis :

With some investigation , I find that  since the issue occurs , the fact that PC sends some data to device doesn't signal EP1 OUTPUT interrupt from the perspective of device. But at this time , EP0 works since the USB descriptor information is transferred successfully.

Would you like to share some idea of digging into this issue ??

Thanks a lot.

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