linux 艾默生直流系统通讯协议通讯协议代码，标准c++代码，支持3种编译器：xscale_be-g++，arm-linux-g++，mxscaleb-g++，可做参考学习用。 -Linux Emerson dc system and communication protocol communications protocol code, standard c++ code, support three compiler: xscale_be-g++, arm-Linux-g++, mxs

北京华 星恒业的 通信规约 C++开发，可作为参考-beijing huaxing protocol

由C编写，CAN的协议栈，可自行修改移植-Written in C, CAN protocol stack, it can modify its own transplant

* This supports access to SPI devices using normal userspace I/O calls. * Note that while traditional UNIX/POSIX I/O semantics are half duplex, * and often mask message boundaries, full SPI support requires full duplex * transfers. There ar