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ethercat 开发板原理图(基于 LAN9252芯片）,原理图画得一般，不美观，大家凑合用

Ethernet has greatly expanded its scope over the years. A simple and effective design makes Ethernet the most popular networking solution at both the physical and data-link layers of the Open Systems Interconnection (OSI) model. The low cost of Ethernet hardware makes it an attractive option for industrial networking applications. Ethernet is also flexible because of the variety of media types and high speed options. The opportunity to use open protocols (such as TCP/IP over Ethernet networks) offers a high level of standardization and interoperability. The result has been an ongoing shift to the use of Ethernet for industrial control and automation applications from traditional serial field

，设计一套准确、稳定的供电电路是摆在每一位工程师面前的首要任务。和自带LCM控制器的小屏幕液晶不同，大屏幕液晶往往需要开发者提供使其工作所需的各种电源，我们再也不能像操作小屏时那样，接上一个3.3V或5V的电压了事。而且大屏幕液晶所需的电源多则6~7种，少则也有4~5种，这对初次尝试调试大屏液晶的开发者来说，几乎令人崩溃。

ucos移植笔记 里面内容通俗易懂 包括启动代码分析 移植过程详解