一个自己独立开发的模拟任务切换的简易内核，采用动态私有任务栈，时间片轮询模式用户还可自行添加新的线程；经过测试，没有问题。适用于Arm7内核的各款芯片-Simple kernel of an independently developed simulation task switching, dynamic private task stack, the time slice polling mode, users can also add their own new thread　tested, there is no problem. Sections of the chip for Arm7 kernel