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What is maximum packet size that you have mentioned in endpoint descriptor?
You should not send the packet more than that is mentioned in the descriptor of the endpoint.
If the endpoint maximum size is 1024(for ISOC) then you can send two packets of 1024.No need for you to specifiy the buffer address. Inside the buffer the data will be stored continuously.You can access the data by using EP2FIFOBUF.at a time you can access only 1024 data.Once the first packet is cleared from the buffer then only you can access the second packet.