]> oss.titaniummirror.com Git - tinyos-2.x.git/blobdiff - tos/chips/rf230/CsmaLayerP.nc
Merge TinyOS 2.1.1 into master.
[tinyos-2.x.git] / tos / chips / rf230 / CsmaLayerP.nc
diff --git a/tos/chips/rf230/CsmaLayerP.nc b/tos/chips/rf230/CsmaLayerP.nc
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-/*
- * 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>
-#include <RadioAssert.h>
-
-module CsmaLayerP
-{
-       provides
-       {
-               interface RadioSend;
-       }
-
-       uses
-       {
-               interface CsmaConfig as Config;
-
-               interface RadioSend as SubSend;
-               interface RadioCCA as SubCCA;
-       }
-}
-
-implementation
-{
-       tasklet_norace message_t *txMsg;
-
-       tasklet_norace uint8_t state;
-       enum
-       {
-               STATE_READY = 0,
-               STATE_CCA_WAIT = 1,
-               STATE_SEND = 2,
-       };
-
-       tasklet_async event void SubSend.ready()
-       {
-               if( state == STATE_READY )
-                       signal RadioSend.ready();
-       }
-
-       tasklet_async command error_t RadioSend.send(message_t* msg)
-       {
-               error_t error;
-
-               if( state == STATE_READY )
-               {
-                       if( call Config.requiresSoftwareCCA(msg) )
-                       {
-                               txMsg = msg;
-
-                               if( (error = call SubCCA.request()) == SUCCESS )
-                                       state = STATE_CCA_WAIT;
-                       }
-                       else if( (error = call SubSend.send(msg)) == SUCCESS )
-                               state = STATE_SEND;
-               }
-               else
-                       error = EBUSY;
-
-               return error;
-       }
-
-       tasklet_async event void SubCCA.done(error_t error)
-       {
-               ASSERT( state == STATE_CCA_WAIT );
-
-               if( error == SUCCESS && (error = call SubSend.send(txMsg)) == SUCCESS )
-                       state = STATE_SEND;
-               else
-               {
-                       state = STATE_READY;
-                       signal RadioSend.sendDone(EBUSY);
-               }
-       }
-
-       tasklet_async event void SubSend.sendDone(error_t error)
-       {
-               ASSERT( state == STATE_SEND );
-
-               state = STATE_READY;
-               signal RadioSend.sendDone(error);
-       }
-}