Merge TinyOS 2.1.1 into master.

[tinyos-2.x.git] / tos / chips / m16c62p / timer / HplM16c62pTimerP.nc

diff --git a/tos/chips/m16c62p/timer/HplM16c62pTimerP.nc b/tos/chips/m16c62p/timer/HplM16c62pTimerP.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.
+ */
+
+/**
+ * Implementation of a generic HplM16c62pTimer interface.
+ *
+ * @author Henrik Makitaavola <henrik.makitaavola@gmail.com>
+ */
+generic module HplM16c62pTimerP (uint16_t timer_addr,
+                                 uint16_t interrupt_addr,
+                                 uint16_t start_addr,
+                                 uint8_t start_bit)
+{
+  provides interface HplM16c62pTimer as Timer;
+
+  uses interface HplM16c62pTimerInterrupt as IrqSignal;
+  uses interface StopModeControl;
+}
+implementation
+{
+#define timer (*TCAST(volatile uint16_t* ONE, timer_addr))
+#define start (*TCAST(volatile uint8_t* ONE, start_addr))
+#define interrupt (*TCAST(volatile uint8_t* ONE, interrupt_addr))
+
+  bool allow_stop_mode = false;
+
+  async command uint16_t Timer.get() { return timer; }
+  
+  async command void Timer.set( uint16_t t )
+  {
+    // If the timer is on it must be turned off, else the value will
+    // only be written to the reload register.
+    atomic
+    {
+      if(call Timer.isOn())
+      {
+        call Timer.off();
+        timer = t;
+        call Timer.on();
+      }
+      else
+      {
+        timer = t;
+      }
+    }
+  }
+
+  // When the timer is turned on in one-shot mode on TimerA
+  // the timer also needs an trigger event to start counting.
+  async command void Timer.on()
+  { 
+    atomic if (!allow_stop_mode)
+    {
+      call StopModeControl.allowStopMode(false);
+    }
+    SET_BIT(start, start_bit); 
+  }
+  
+  async command void Timer.off()
+  { 
+    CLR_BIT(start, start_bit);
+    atomic if (!allow_stop_mode)
+    {
+      call StopModeControl.allowStopMode(true);
+    }
+  }
+  
+  async command bool Timer.isOn() { return READ_BIT(start, start_bit); }
+  async command void Timer.clearInterrupt() { clear_interrupt(interrupt_addr); }
+  async command void Timer.enableInterrupt() { SET_BIT(interrupt, 0); }
+  async command void Timer.disableInterrupt() { CLR_BIT(interrupt, 0); }
+  async command bool Timer.testInterrupt() { return READ_BIT(interrupt, 3); }
+  async command bool Timer.isInterruptOn() { return READ_BIT(interrupt, 0); }
+
+  async command void Timer.allowStopMode(bool allow)
+  {
+    allow_stop_mode = allow;
+  }
+ 
+  // Forward the timer interrupt event.  
+  async event void IrqSignal.fired() { signal Timer.fired(); }
+
+  default async event void Timer.fired() { } 
+}