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文章介绍了一种带有USB接口的公交验卡机系统,阐述了该系统的工作原理和USB接口电路,并介绍了USB设备的软件设计方法。由于采用了USB接口,可以克服以往IC卡系统不支持热插拔和不能与外设灵活连接的缺点。
This paper introduces a bus card machine system with USB interface, describes the working principle of the system and the USB interface circuit, and introduces the USB device software design method. As a result of the USB interface, you can overcome the previous IC card system does not support hot-swappable and flexible peripherals can not connect the shortcomings.