read the paper by Philip Levis 《Experiences from a Decade of TinyOS Development》， this is very important paper for tinyos. I translate it into chinese ---> look this translate
I think if you want to really know nesc programming, you must read the source code app.c(compiled by compiler ncc) and the .nc source file difference, Also, You'd better read TinyOS system's Timer and Task schedule and Virtualize part, This design, TinyOS use 5 more years to evolute.if you want to know more about the system design, Just read the TEPS. for example, In TEP131, reading this paper, You will know TinyOS 2.x platform creating steps. even you can create you own platform.
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在这里您会找到许多示例和许多其他文档。
http://docs.tinyos.net
Here you will find many examples and many other documentations.
http://docs.tinyos.net
对于我来说（学习 TinyOS 2 年并用它做一些嵌入式项目）我给你写一些建议：
我想如果你想真正了解nesc编程，你必须阅读源代码app.c（由编译器ncc编译）和.nc源文件差异，另外，你最好阅读TinyOS系统的定时器和任务调度以及虚拟化部分，这个设计，TinyOS用了5年多的时间来进化。如果你想了解更多关于系统设计的信息，只需阅读TEPS。
例如，在 TEP131 中，阅读本文，您将了解TinyOS 2.x平台创建步骤。 甚至您可以创建自己的平台。
玩得开心~
For me(Study TinyOS 2 years and use it do some embedded projects) I write some advise to you:
I think if you want to really know nesc programming, you must read the source code app.c(compiled by compiler ncc) and the .nc source file difference, Also, You'd better read TinyOS system's Timer and Task schedule and Virtualize part, This design, TinyOS use 5 more years to evolute.if you want to know more about the system design, Just read the TEPS.
for example, In TEP131, reading this paper, You will know TinyOS 2.x platform creating steps. even you can create you own platform.
Have fun~