endpointdescriptor.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 125 行

/*
 * $Id: EndPointDescriptor.java,v 1.1 2003/11/25 11:41:20 epr Exp $
 */
package org.jnode.driver.usb;

/**
 * @author Ewout Prangsma ([e-mail])
 */
public final class EndPointDescriptor extends AbstractDescriptor {

	/**
	 * Initialize this instance.
	 */
	public EndPointDescriptor() {
		super(USB_DT_ENDPOINT_SIZE);
	}
	
	/**
	 * @param data
	 * @param ofs
	 * @param len
	 */
	public EndPointDescriptor(byte[] data, int ofs, int len) {
		super(data, ofs, len);
	}

	/**
	 * Gets the address of this endpoint.
	 * This is a combination of address and direction.
	 */
	public final int getEndPointAddress() {
		return getByte(2);
	}
	
	/**
	 * Gets the number of this endpoint.
	 */
	public final int getEndPointNumber() {
		return getByte(2) & USB_ENDPOINT_NUMBER_MASK;
	}
	
	/**
	 * Gets the direction of this endpoint.
	 */
	public final boolean isDirIn() {
		return ((getByte(2) & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN);
	}
	
	/**
	 * Gets the direction of this endpoint.
	 */
	public final boolean isDirOut() {
		return ((getByte(2) & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT);
	}
	
	/**
	 * Gets the attributes of this endpoint.
	 * This is a combination of tranfer type, synchronization type and usage type.
	 */
	public final int getAttributes() {
		return getByte(3);
	}
	
	/**
	 * Gets the transfer type of this endpoint.
	 */
	public final int getTransferType() {
		return getByte(3) & USB_ENDPOINT_XFERTYPE_MASK;
	}
	
	/**
	 * Is the transfer type of this endpoint control.
	 */
	public final boolean isControlTransfer() {
		return ((getByte(3) & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_CONTROL);
	}
	
	/**
	 * Is the transfer type of this endpoint interrupt.
	 */
	public final boolean isIntTransfer() {
		return ((getByte(3) & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT);
	}
	
	/**
	 * Is the transfer type of this endpoint bulk.
	 */
	public final boolean isBulkTransfer() {
		return ((getByte(3) & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK);
	}
	
	/**
	 * Is the transfer type of this endpoint isochronous.
	 */
	public final boolean isIsochronousTransfer() {
		return ((getByte(3) & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_ISOC);
	}
	
	/**
	 * Gets the maximum size of packets
	 */
	public final int getMaxPacketSize() {
		return getShort(4) & USB_ENDPOINT_MAXPS_MASK;
	}
	
	/**
	 * Gets the interval for polling
	 */
	public final int getInterval() {
		return getByte(6);
	}
	
	/**
	 * Convert to a String representation 
	 * @see java.lang.Object#toString()
	 */
	public final String toString() {
		return "EP[epnum:" + getEndPointNumber() +
			", dir:" + (isDirIn() ? "IN" : "OUT") +
			", xfertype:" + USB_ENDPOINT_XFER_NAMES[getTransferType()] +
			", mpsize:" + getMaxPacketSize() +
			", intval:" + getInterval() + "]";
	}
}