Not able to send data from USB Isochronous IN endpoint to host

Hi
I am using Atmel's AT91SAM7S64 microcontroller which
includes a USB device port. We have written the firmware for this
controller to send a packet of data through USB Endpoint 1. We have made
this endpoint as Isochronous In endpiont. Now our problem is we are
writing the packet in the Fifo data register of the USB endpoint 1 and
then we are also setting the TXPKTRDY flag as 1 as well(This is required
by the controller to make it know that the packet is ready to be sent). But
when we send an IN token from the host to receive the data we do not get
any data at the host. we have checked through the debugger(IAR EWARM) that
when we send an IN token from the host the TXPKTRDY flag gets reset to 0
again. Does this mean that the data in the buffer of the endpoint has been
sent to the host? One more important thing at the time of debugging the
firmware when we write any data into the FIFO data register of desired
endpoint by the firmware and when we watch for the current value of that
FIFo data register inside the Watch window we do not see the correct data
which has been written by us. Also the value of FDR gets changed anytime
even though it is not being written. We dont know whether this behaviour
is ok or not? Anybody having experience with this Please help.
Thanks
Faiyaz Pisuwala

.

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