STM32F4基础应用程序和串口对应基础程序，程序代码为C语言，清晰易懂(STM32F4 basic application and serial corresponding basic program, program code is C language, clear and easy to understand)

从网上下载的STM32 IAP源码和测试代码，已经移值到我自己的板子上，很容易，和大家共享。(Downloaded from the Internet STM32 IAP source and test code, the value has been moved to my own board, it is easy, and share.)