JavaCard OS

Posted: **Fri Aug 31, 2018 2:54 am**

Hello, everybody~
lately, I implement the CCID protocol. Then I test it. The first problem appeared. If the length of message is package length, the communication would become silent. Other circumstances, the communication is ok. You could help me?

Posted: **Tue Sep 11, 2018 4:57 am**

I got the answer from <Device Class: Smart Card>.

The CCID is required to send a Zero Length Packet (ZLP) following any Bulk-In
message that is a multiple of MaxPacketSize. This ZLP allows the CCID device driver to
be more efficient, and is generally considered “good-practice” for USB bulk-in pipes.

So, I should send a empty packet.

JavaCard OS

Why my ccid cannot send the message which the length is equal to package length

Why my ccid cannot send the message which the length is equal to package length

Re: Why my ccid cannot send the message which the length is equal to package length