示例代码部分展示,打开USB_VBUS_IGNORE宏定义: ( R% u$ N% V8 l- U$ Y/*** @brief ignore vbus detection, only available in at32f415xx revision C.* at32f415xx revision B: (not support)* the vbus detection pin (pa9) can not be used for other functionality.* vbus pin must kept at VBUS or VDD.** at32f415xx revision C: (support)* ignore vbus detection, the internal vbus is always valid.* the vbus pin (pa9) can be used for other functionality*/#define USB_VBUS_IGNORE