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LPC2478 - USB does not transmit more than 64 bytes

Hi,

I'm using LPC2478 for USB comunication in CDC mode (RL-USB).

In my project I look forward to receiving a data packet, and then send a response corresponding to that data packet.
But this response is not sent when its size is larger than 64 bytes. This makes USB hang up when receiving data.

Someone already have this problem?