Bus-powered指Hub消耗的电能（hub本身和其下行端口对外提供的电能）全部来自上行端口的Vbus.Self-powered是指hub下行端口的对外供电全部来自本地外部供电而非上行端口的Vbus
iConfiguration:指向描述此配置字符串的索引,该字符串描述符存储在设备的字符串描述符表中,用于人类可读的配置名称。 bmAttributes:位字段,包含配置特性标志,例如自供电(Self-powered)、远程唤醒能力(Remote Wakeup)等。 MaxPower:指定设备在工作于当前配置下从USB总线上请求的最大电流,以2mA为单位,并且转换为实际功率(...
Over-current ProtectionThe host and all self-poweredhubsmust implement over-current protection for sa...
特别注意,对于self powered device而言,Vbus被设置为无效后,该device的receiver termination必须对外显示为高阻抗的状态,即ZRX*−HIG**H*−IMP*−*DC*−POS*>25K 2. Warm Reset Warm Reset是被称之为"inband reset"的一种复位方式,是一种功能复位(inband我个人理解其实就是链路双方均在线上),效果和Power...
例如,可以确定设备是从总线还是外部源中取电, (请参阅UsbConfigurationDescriptor.SelfPowered) 。 如果设备正在从总线供电,则) 消耗的功率 (以毫安为单位 (请参阅UsbConfigurationDescriptor.MaxPowerMilliamps) 。 此外,还可以通过获取UsbConfigurationDescriptor.RemoteWakeup值来确定设备是否能够从...
public virtual bool IsSelfPowered { [Android.Runtime.Register("isSelfPowered", "()Z", "GetIsSelfPoweredHandler")] get; } Eigenschaftswert Boolean das self-powered-Attribut der Konfiguration Attribute RegisterAttribute Hinweise Gibt das Attributfeld der Konfiguration des selbstgesteuerten Attribut...
UsbConfigurationDescriptor 属性 ConfigurationValue MaxPowerMilliamps RemoteWakeup SelfPowered 方法 UsbControlRecipient UsbControlRequestType UsbControlTransferType UsbDescriptor UsbDevice UsbDeviceClass UsbDeviceClasses UsbDeviceDescriptor UsbEndpointDescriptor
这是本地电源有效时((self-powered)或者变得有效时(bus-powered)的默认状态。端口在下面的任意情形下转换进入本状态: 从DSPORT.Powered-off状态,当集线器收到SetPortFeature(PORT_POWER)请求时。 从除了DSPORT.Powered-off状态的任意状态,当端口检测到一个断开连接事件。
( &setupPacket, BmRequestToDevice,0); hr = SendControlTransferSynchronously( &(setupPacket.WinUsb), & deviceStatus,sizeof(USHORT), &bytesReturned );if(SUCCEEDED(hr)) {if(deviceStatus & USB_GETSTATUS_SELF_POWERED) { m_Self_Powered =true; }if(deviceStatus & USB_GETSTATUS_REMOTE_WAKEUP_...
A self-powered USB peripheral provides its own power, so is it okay to connect just D+, D- and GND to the host port, or do you always have to connect +5V as well, then wait for the negotiation phase for the device to tell the host that it is self-powered ...