The user-process must flush dcache for the buffer before using this command.
The user-process must flush dcache for the buffer before using this command.
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When sending data where size is larger than wMaxPacketSize, it will automatically send multiple USB packets where last packet size = {remaining size}. Every {wMaxPacketSize}-bytes is a different packet.
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For receiving data, if size is less than {actual received USB packet size} the rest of the packet will be discarded. Later PostBufferAsync cmd(s) will only return data from new packets, not the remainder of the earlier packet(s).