一个关于stm32单片机的IAP例程，keil-mdk编译，通过uart串口接收上位机软件升级的bootload.-A microcontroller on the stm32 IAP routines, keil-mdk compiled by uart serial port to receive PC software upgrades bootload.

STM32 BootLoader升级程序(STM32 BootLoader UPdata)

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)