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这是俺入门2812时移植的国产实时操作系统RT-Thread到2812上。由于线程切换使用了两个Timer感觉怪怪的没应用到项目中进行严格测试过，哪个有兴趣拿去玩吧。顺便再吐槽一下2812的软中断居然不能屏蔽，这跟函数调用有何区别？
