库文件名称：driver8155.h

功能描述：驱动8155，不需要了解8255的工作原理，透明操作8255的三个输入输出口PA、PB、PC

读A口只需要调用rd_PA,写则需要调用wr_PA B、C操作也一样

全局变量: IO_flags，在其它程序中不能对其改写

特殊说明: 无-Library file name: driver8155.h Features: Driver 8155, 8255 do not need to understand the working principle of transparent operation of the three input and output port 8255 PA, PB, PC Reading A I just need to call rd_PA, was the need to call wr_PA　B , C operation is the same global variable: IO_flags, in other programs can not rewrite its special Descr iption: None