Merge TinyOS 2.1.1 into master.

[tinyos-2.x.git] / tos / chips / rf2xx / util / RadioAlarmP.nc

diff --git a/tos/chips/rf2xx/util/RadioAlarmP.nc b/tos/chips/rf2xx/util/RadioAlarmP.nc
new file mode 100644 (file)
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+++ b/tos/chips/rf2xx/util/RadioAlarmP.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 RadioAlarmP
+{
+       provides
+       {
+               interface RadioAlarm[uint8_t id];
+       }
+
+       uses
+       {
+               interface Alarm<TRadio, uint16_t>;
+               interface Tasklet;
+       }
+}
+
+implementation
+{
+       norace uint8_t state;
+       enum
+       {
+               STATE_READY = 0,
+               STATE_WAIT = 1,
+               STATE_FIRED = 2,
+       };
+
+       tasklet_norace uint8_t alarm;
+
+       async event void Alarm.fired()
+       {
+               atomic
+               {
+                       if( state == STATE_WAIT )
+                               state = STATE_FIRED;
+               }
+
+               call Tasklet.schedule();
+       }
+
+       inline async command uint16_t RadioAlarm.getNow[uint8_t id]()
+       {
+               return call Alarm.getNow();
+       }
+
+       tasklet_async event void Tasklet.run()
+       {
+               if( state == STATE_FIRED )
+               {
+                       state = STATE_READY;
+                       signal RadioAlarm.fired[alarm]();
+               }
+       }
+
+       default tasklet_async event void RadioAlarm.fired[uint8_t id]()
+       {
+       }
+
+       inline tasklet_async command bool RadioAlarm.isFree[uint8_t id]()
+       {
+               return state == STATE_READY;
+       }
+
+       tasklet_async command void RadioAlarm.wait[uint8_t id](uint16_t timeout)
+       {
+               ASSERT( state == STATE_READY );
+
+               alarm = id;
+               state = STATE_WAIT;
+               call Alarm.start(timeout);
+       }
+
+       tasklet_async command void RadioAlarm.cancel[uint8_t id]()
+       {
+               ASSERT( alarm == id );
+               ASSERT( state != STATE_READY );
+
+               call Alarm.stop();
+               state = STATE_READY;
+       }
+}