STM32F103C8Serial(UART)toUSBHIDKeyboardMouse串口转USB键盘鼠标(1)使用CompositeDevice组合(复合)设备(1.1)1个Device->1个Configuation->2个Interfance(Keyboard&Mouse)(1.2)KeyboardInterfance->HID(bootmode)->2个Endpoint(IN_0x81&OUT_0x01)->KeyboardReportDescriptor(不使用ReportID)(1.3)MouseInterf