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How to send a zero length packet

Question asked by ShuWei Li on Sep 3, 2018
Latest reply on Sep 10, 2018 by ShuWei Li

             I design a HID USB device with the LPC2468. According to the USB specification,when processing the Setup transfer, a zero length packet should be sended to the host at the status stage .I want to know the flow about sending the zero length packet