Package ch.ntb.usb
Class Usb_Config_Descriptor
- java.lang.Object
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- ch.ntb.usb.Usb_Descriptor
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- ch.ntb.usb.Usb_Config_Descriptor
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public class Usb_Config_Descriptor extends Usb_Descriptor
Represents the descriptor of a USB configuration.
A USB device can have several different configuration.
The length of the configuration descriptor isUsb_Descriptor.USB_DT_CONFIG_SIZE
and the type isUsb_Descriptor.USB_DT_CONFIG
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Field Summary
Fields Modifier and Type Field Description static int
USB_MAXCONFIG
Maximum number of configurations per device-
Fields inherited from class ch.ntb.usb.Usb_Descriptor
USB_DT_CONFIG, USB_DT_CONFIG_SIZE, USB_DT_DEVICE, USB_DT_DEVICE_SIZE, USB_DT_ENDPOINT, USB_DT_ENDPOINT_AUDIO_SIZE, USB_DT_ENDPOINT_SIZE, USB_DT_HID, USB_DT_HUB, USB_DT_HUB_NONVAR_SIZE, USB_DT_INTERFACE, USB_DT_INTERFACE_SIZE, USB_DT_PHYSICAL, USB_DT_REPORT, USB_DT_STRING
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Constructor Summary
Constructors Constructor Description Usb_Config_Descriptor()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description byte
getBConfigurationValue()
Returns the value to use as an argument to select this configuration (LibusbJava.usb_set_configuration(long, int)
).byte
getBmAttributes()
Returns the power parameters for this configuration.
Bit 7: Reserved, set to 1 (USB 1.0 Bus Powered)
Bit 6: Self Powered
Bit 5: Remote Wakeup
Bit 4..0: Reserved, set to 0byte
getBNumInterfaces()
Returns the number of interfaces.byte[]
getExtra()
Returns the data of extra descriptor(s) if available.int
getExtralen()
Returns the number of bytes of the extra descriptor.byte
getIConfiguration()
Returns the index of the String descriptor describing this configuration.Usb_Interface[]
getInterface()
Returns the USB interface descriptors.byte
getMaxPower()
Returns the maximum power consumption in 2mA units.short
getWTotalLength()
Returns the total length in bytes of all descriptors.
When the configuration descriptor is read, it returns the entire configuration hierarchy which includes all related interface and endpoint descriptors.java.lang.String
toString()
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Methods inherited from class ch.ntb.usb.Usb_Descriptor
getBDescriptorType, getBLength
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Field Detail
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USB_MAXCONFIG
public static final int USB_MAXCONFIG
Maximum number of configurations per device- See Also:
- Constant Field Values
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Method Detail
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getBConfigurationValue
public byte getBConfigurationValue()
Returns the value to use as an argument to select this configuration (LibusbJava.usb_set_configuration(long, int)
).- Returns:
- the value to use as an argument to select this configuration
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getBmAttributes
public byte getBmAttributes()
Returns the power parameters for this configuration.
Bit 7: Reserved, set to 1 (USB 1.0 Bus Powered)
Bit 6: Self Powered
Bit 5: Remote Wakeup
Bit 4..0: Reserved, set to 0- Returns:
- the power parameters for this configuration
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getBNumInterfaces
public byte getBNumInterfaces()
Returns the number of interfaces.- Returns:
- the number of interfaces
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getExtra
public byte[] getExtra()
Returns the data of extra descriptor(s) if available.- Returns:
- null or a byte array with the extra descriptor data
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getExtralen
public int getExtralen()
Returns the number of bytes of the extra descriptor.- Returns:
- the number of bytes of the extra descriptor
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getIConfiguration
public byte getIConfiguration()
Returns the index of the String descriptor describing this configuration.- Returns:
- the index of the String descriptor
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getInterface
public Usb_Interface[] getInterface()
Returns the USB interface descriptors.- Returns:
- the USB interface descriptors
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getMaxPower
public byte getMaxPower()
Returns the maximum power consumption in 2mA units.- Returns:
- the maximum power consumption in 2mA units
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getWTotalLength
public short getWTotalLength()
Returns the total length in bytes of all descriptors.
When the configuration descriptor is read, it returns the entire configuration hierarchy which includes all related interface and endpoint descriptors. ThewTotalLength
field reflects the number of bytes in the hierarchy.- Returns:
- the total length in bytes of all descriptors
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toString
public java.lang.String toString()
- Overrides:
toString
in classjava.lang.Object
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