Control method, USB system and electronic device

The present invention discloses a control method for controlling a USB system (10). The USB system (10) includes an embedded circuit (11), a USB controller (12), and a plurality of interfaces (13). The embedded circuit (11) includes a switching circuit (112). The switching circuit (112) is connected to a plurality of interfaces (13). The control method includes the following steps: (S11) polling aplurality of interfaces to determine device access states of the plurality of interfaces; and (S12) establishing a USB controller by using the switching circuit when it is determined that one of theinterfaces of the plurality of interfaces has device access The link to the interface. In addition, the present invention also discloses a USB system (10) and an electronic device (100). 本发明公开了种控制方法，用于控制USB系统(10)。USB系统(10)包括嵌入式电路(11)、USB控制器(12)和多个接口(13)。嵌入式电路(11)包括切换电路(112)。切换电路(112)连接多个接口(13)。控制方法包括以下步骤：(S11)轮询多个接口以确定多个接口的设备接入状态；和(S12)当确定多个接口的其中个接口存在设备接入时利用切换电路建立USB控制器与接口的链路。此外，本发明还公开了种USB系统(10)和电子装置(100)。