车位刷卡器的主控程序；关键点在于使用gpio模拟串口；很难调试好，我花了10多天的时间才调好的。 开发环境为keilC,选择intel 的8052型号单片机可直接使用-Parking swipe card reader of the master program key point is to use gpio simulate serial it is difficult to debug, I spent more than 10 days to to dubug it. Devel