+++ /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>
-#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);
- }
-}