ARM的定时器的应用，功能较简单，主要是自我学习，参考例说STM32等相关手册，如要详述的可以去看源码-ARM-timer applications, functionality is relatively simple, self-learning, reference example STM32 and other manuals, such as detailed you can see a source

ARM的串口的应用，功能较简单，主要是自我学习，参考例说STM32等相关手册，如要详述的可以去看源码-ARM serial port application functionality is relatively simple, largely self-study reference case STM32 and other relevant manuals, such as can see a detailed source