此码为STM32微处理器在MDK3.5下基于STM32 STD3.0库的编译源码，实现的功能是将SD卡上的txt类型文件内容通过串口输出,测试读文件速度大约在1M BYTEs/s。-This code for the the STM32 microprocessor in MDK3.5 compile source the STM32 STD3.0 library, the function will be the speed of file txt type file on the SD ca