Merge TinyOS 2.1.1 into master.

[tinyos-2.x.git] / tos / chips / m16c62p / timer / M16c62pAlarm16C.nc

diff --git a/tos/chips/m16c62p/timer/M16c62pAlarm16C.nc b/tos/chips/m16c62p/timer/M16c62pAlarm16C.nc
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+++ b/tos/chips/m16c62p/timer/M16c62pAlarm16C.nc
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+/*
+ * Copyright (c) 2009 Communication Group and Eislab at
+ * Lulea University of Technology
+ *
+ * Contact: Laurynas Riliskis, LTU
+ * Mail: laurynas.riliskis@ltu.se
+ * All rights reserved.
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the
+ *   distribution.
+ * - Neither the name of Communication Group at Lulea University of Technology
+ *   nor the names of its contributors may be used to endorse or promote
+ *    products derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL STANFORD
+ * UNIVERSITY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * Build a TEP102 16bits Alarm from a counter and a M16c62p hardware timers.
+ * Use the counter to get the "current time" and the hw timer to count down the
+ * remaining time for the alarm to be fired.
+ *
+ * @author Henrik Makitaavola <henrik.makitaavola@gmail.com>
+ */
+
+generic module M16c62pAlarm16C(typedef precision_tag)
+{
+  provides interface Alarm<precision_tag, uint16_t> as Alarm @atmostonce();
+
+  uses interface HplM16c62pTimer as ATimer; // Alarm Timer
+  uses interface Counter<precision_tag, uint16_t>;
+}
+implementation
+{
+  uint16_t alarm = 0;
+  async command uint16_t Alarm.getNow()
+  {
+    return call Counter.get();
+  }
+
+  async command uint16_t Alarm.getAlarm()
+  {
+    return alarm;
+  }
+
+  async command bool Alarm.isRunning()
+  {
+    return call ATimer.isInterruptOn();
+  }
+
+  async command void Alarm.stop()
+  {
+    atomic
+    {
+      call ATimer.off();
+      call ATimer.disableInterrupt();
+    }
+  }
+
+  async command void Alarm.start( uint16_t dt ) 
+  {
+    call Alarm.startAt( call Alarm.getNow(), dt);
+  }
+
+  async command void Alarm.startAt( uint16_t t0, uint16_t dt )
+  {
+    atomic
+    {
+      uint16_t now, elapsed, expires;
+
+      now = call Alarm.getNow();
+      elapsed = now - t0;
+        
+      if (elapsed >= dt)
+      {
+        expires = 0;
+      }
+      else
+      {
+        expires = dt - elapsed - 1;
+      }
+        
+      call ATimer.off();
+      call ATimer.set(expires);
+      call ATimer.clearInterrupt();
+      call ATimer.enableInterrupt();
+      call ATimer.on();
+    }
+  }
+
+  async event void ATimer.fired()
+  {
+    call Alarm.stop();
+    signal Alarm.fired();
+  }
+
+  async event void Counter.overflow() {}
+}