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/*
* Java libusb wrapper
* Copyright (c) 2005-2006 Andreas Schlaepfer <spandi at users.sourceforge.net>
*
* http://libusbjava.sourceforge.net
* This library is covered by the LGPL, read LGPL.txt for details.
*/
package ch.ntb.usb;
/**
* Represents the descriptor of a USB configuration.<br>
* A USB device can have several different configuration.<br>
* <br>
* The length of the configuration descriptor is
* {@link ch.ntb.usb.Usb_Descriptor#USB_DT_CONFIG_SIZE} and the type is
* {@link ch.ntb.usb.Usb_Descriptor#USB_DT_CONFIG}.
*
*/
public class Usb_Config_Descriptor extends Usb_Descriptor {
/**
* Maximum number of configurations per device
*/
public static final int USB_MAXCONFIG = 8;
private short wTotalLength;
private byte bNumInterfaces;
private byte bConfigurationValue;
private byte iConfiguration;
private byte bmAttributes;
private byte MaxPower;
private Usb_Interface[] interface_;
private byte[] extra; /* Extra descriptors */
private int extralen;
/**
* Returns the value to use as an argument to select this configuration ({@link LibusbJava#usb_set_configuration(long, int)}).
*
* @return the value to use as an argument to select this configuration
*/
public byte getBConfigurationValue() {
return bConfigurationValue;
}
/**
* Returns the power parameters for this configuration.<br>
* <br>
* Bit 7: Reserved, set to 1 (USB 1.0 Bus Powered)<br>
* Bit 6: Self Powered<br>
* Bit 5: Remote Wakeup<br>
* Bit 4..0: Reserved, set to 0
*
* @return the power parameters for this configuration
*/
public byte getBmAttributes() {
return bmAttributes;
}
/**
* Returns the number of interfaces.<br>
*
* @return the number of interfaces
*/
public byte getBNumInterfaces() {
return bNumInterfaces;
}
/**
* Returns the data of extra descriptor(s) if available.<br>
*
* @return null or a byte array with the extra descriptor data
*/
public byte[] getExtra() {
return extra;
}
/**
* Returns the number of bytes of the extra descriptor.<br>
*
* @return the number of bytes of the extra descriptor
*/
public int getExtralen() {
return extralen;
}
/**
* Returns the index of the String descriptor describing this configuration.<br>
*
* @return the index of the String descriptor
*/
public byte getIConfiguration() {
return iConfiguration;
}
/**
* Returns the USB interface descriptors.<br>
*
* @return the USB interface descriptors
*/
public Usb_Interface[] getInterface() {
return interface_;
}
/**
* Returns the maximum power consumption in 2mA units.<br>
*
* @return the maximum power consumption in 2mA units
*/
public byte getMaxPower() {
return MaxPower;
}
/**
* Returns the total length in bytes of all descriptors.<br>
* When the configuration descriptor is read, it returns the entire
* configuration hierarchy which includes all related interface and endpoint
* descriptors. The <code>wTotalLength</code> field reflects the number of
* bytes in the hierarchy.
*
* @return the total length in bytes of all descriptors
*/
public short getWTotalLength() {
return wTotalLength;
}
@Override
public String toString() {
return "Usb_Config_Descriptor bNumInterfaces: 0x"
+ Integer.toHexString(bNumInterfaces);
}
}
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