基于君正4740的按键驱动程序，里面包括了linux驱动程序以及app测试程序，app程序用来跟驱动程序通信，还附带了君正文档，新手很方便使用！-Jun is based on the key drivers of 4740, which includes the linux drivers and test procedures app, app uses to communicate with the driver, but also with the king is the documen