ch375b设置为主机模式与usb设备通信，调试发现该设备有两个接口分别对应两个设备，怎样使用CH375b与这种USB组合设备痛通信呢？下面是USB组合设备相关信息 Usb composite device: Bus Type: USB 2.0 mode Bus Speed: 480 megabit (hi-speed) Power Drawn: 500 milliamps @ 5.0 volts Endpoint 0: Type=CTL Class=08 SubClass=06 Protocol=50 MaxPacket=8 Endpoint 2 OUT: Type=BULK Class=08 SubClass=06 Protocol=50 MaxPacket=40 Endpoint 3 OUT: Type=BULK Class=ff SubClass=42 Protocol=01 MaxPacket=40 Endpoint 3 IN: Type=BULK Class=08 SubClass=06 Protocol=50 MaxPacket=40 Endpoint 4 IN: Type=BULK Class=ff SubClass=42 Protocol=01 MaxPacket=40 Hardware ID: USB\Vid_17ef&Pid_7423&Rev_0216 Usb mass storage device: Bus Type: USB 2.0 mode Bus Speed: 480 megabit (hi-speed) Power Drawn: 500 milliamps @ 5.0 volts Endpoint 0: Type=CTL Class=08 SubClass=06 Protocol=50 MaxPacket=40 Endpoint 2 OUT: Type=BULK Class=08 SubClass=06 Protocol=50 MaxPacket=40 Endpoint 3 IN: Type=BULK Class=08 SubClass=06 Protocol=50 MaxPacket=40 Hardware ID: USB\Vid_17ef&Pid_7423&Rev_0216&MI_00 Composite adb interface: Bus Type: USB 2.0 mode Bus Speed: 480 megabit (hi-speed) Power Drawn: 500 milliamps @ 5.0 volts Endpoint 0: Type=CTL Class=ff SubClass=42 Protocol=01 MaxPacket=40 Endpoint 3 OUT: Type=BULK Class=ff SubClass=42 Protocol=01 MaxPacket=40 Endpoint 4 IN: Type=BULK Class=ff SubClass=42 Protocol=01 MaxPacket=40 Hardware ID: USB\Vid_17ef&Pid_7423&Rev_0216&MI_01