FreeRTOS比较新的版本4.1.0版（不知道是不是最新版本），FreeRTOS也是也免费的源代码开放的操作系统，内部有很多移植范例，包括lwip和uip的，（大家不用为了lwip在uc/os-ii上的移植烦恼了），移植范例包括在各种处理器平台和各种编译器上的，如果大家想研究研究FreeRTOS这个操作系统，还是很不错的，尽管用的人不多，不过这些移植范例真的有很大的参考意义的，FreeRTOS的官方网站上发布的版本并不是最新版本，有些论坛上上传的版本都是很久以前的版本了，这个版本是我从国外网站上找的。-FreeRTOS relatively new version 4.1.0 version (do not know whether the latest version), FreeRTOS is also a free open source operating system, there are many examples of transplantation, including lwIP and the uip, (there is no need for lwIP in uc/os-ii on the troubles of transplantation), transplantation in a variety of examples, including a variety of processor platforms and compilers on, if everyone would like to look FreeRTOS the operating system, still very good, although not many people, but Examples of these transplants really have a great reference significance, FreeRTOS official version available on the website is not the latest version, some versions of the forum are a long time to upload the previous version, this version is my web site from abroad to find of.