一个学习DMA的好例子，包括应用，你可在这个代码的基础上做一些修改，以适应你的需求-it is a good code of dam,you need do some change for this code, if you needs

关于STM32F205的串口配置，此代码详细的说明了F5芯片的用DMA配的串口。-About STM32F205 serial port configuration, this code detailed illustrates the F5 chips using DMA with serial port.