--- /dev/null
+/*
+ * Copyright (c) 2007, Vanderbilt University
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice, the following
+ * two paragraphs and the author appear in all copies of this software.
+ *
+ * IN NO EVENT SHALL THE VANDERBILT UNIVERSITY BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE VANDERBILT
+ * UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THE VANDERBILT UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE VANDERBILT UNIVERSITY HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Author: Miklos Maroti
+ */
+
+#include <Tasklet.h>
+
+interface RadioCCA
+{
+ /**
+ * Starts the clear channel assesment procedure. Returns EBUSY if the radio
+ * is currently servicing a clear channel assesment, and SUCCESS otherwise.
+ * The check will be performed only in the RX_READY state.
+ */
+ tasklet_async command error_t request();
+
+ /**
+ * Signals the completion of the clear channel assesment send command.
+ * SUCCESS means the channel is clear, EBUSY means the channel is not
+ * clear, and FAIL means that the clear channel assesment could not
+ * be finished or the operation was cancelled.
+ */
+ tasklet_async event void done(error_t error);
+}