Add the averaging components and their interface.

[tinyos-2.x.git] / tos / platforms / tmirws / sensors / AverageU16C.nc

diff --git a/tos/platforms/tmirws/sensors/AverageU16C.nc b/tos/platforms/tmirws/sensors/AverageU16C.nc
new file mode 100644 (file)
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+++ b/tos/platforms/tmirws/sensors/AverageU16C.nc
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+/*
+ * Copyright (c) 2008, Titanium Mirror, Inc.
+ * 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 Titanium Mirror, Inc. 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 THE COPYRIGHT
+ * OWNER OR 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.
+ */
+ 
+/**
+ * Average scalar values.
+ * 
+ * @author R. Steve McKown <rsmckown@gmail.com>
+ */
+ 
+#include "AeroVane.h"
+
+generic module AverageU16(uint16_t samples) {
+  provides interface Average<aerovector_t>;
+}
+implementation {
+  uint8_t m_count;
+  uint16_t m_value;
+
+  inline void init()
+  {
+    m_count = 0;
+    m_value = 0;
+  }
+
+  command void Average.reset()
+  {
+    init();
+  }
+
+  task void signalAverage()
+  {
+    uint16_t value;
+
+    value = (m_value + (m_count / 2)) / m_count;
+    init();
+
+    /* Inform the consumer of the vector */
+    signal Average.average(vector);
+  }
+
+  command Average.submit(uint16_t value)
+  {
+    m_value += value;
+    if (++m_count == samples)
+      post signalAverage();
+  }
+
+  command Average.null()
+  {
+    if (++m_count == samples)
+      post signalAverage();
+  }
+}