platform support for the IRIS mote (atm1218 MCU and rf230 radio)

[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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+++ 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);
+       }
+}