无需外扩ram即可在51上执行的占先式RTOS 可移植,完全免费,公开源代码 具有详细中文文档和注释 (作者已经把它运用到实际的项目中)-without ram can be extended outside of the 51 on the implementation of preemptive RTOS portable, free, open-source with the Chinese documents and detai