small rtos　 陈明计，这个人有必要要认识下，因为small rtos 是他写的，他根据ucos的原理写的。这个small rtos是可以再51单片机上运行的，但是受ARM内存的限制。 作为单片机开发的时刻都得想着内存的问题，因为51芯片资源有限。(small rtos Chen Ming plan, this person needs to know, because small RTOS he wrote, he wrote on the basis of the principle of ucos. This small RTOS can run on 51 single-chip computers, but it is limited by ARM memory. As a microcontroller development, always have to think about memory, because the 51 chip resources are limited.)