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SPI，是英语Serial Peripheral Interface的缩写，顾名思义就是串行外围设备接口。SPI，是一种高速的，全双工，同步的通信总线，并且在芯片的管脚上只占用四根线，节约了芯片的管脚
i2c protocol,this program to 8951 hardware systems
A reference of SIP protocol stack, very good.
RPC: Remote Procedure Call Protocol Specification Version 2
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