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i2c protocol,this program to 8951 hardware systems
A reference of SIP protocol stack, very good.
HCI USB driver for Linux Bluetooth protocol stack
PIC USB source code,include usb protocol stack.
ATMEL 90usb128 USB source,include USB protocol stack.
UBX protocol specification for u-blox 5 receiver.
protocol for serial communication in rs485 network device
email client and support pop3、smtp、imap protocol.
SIP Understanding the Session Initiation Protocol, Second Edition
document about DEEC protocol for wireless sensor network