Diff: WindVane.cpp

Revision:

1:c7958aa34fa1

Parent:

0:616601bde9fb

diff -r 616601bde9fb -r c7958aa34fa1 WindVane.cpp
--- a/WindVane.cpp	Thu Feb 23 21:38:39 2012 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,96 +0,0 @@
-/* Copyright 2012 Adam Green (http://mbed.org/users/AdamGreen/)
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-/* Declaration of class to interface with wind vane sensor Sparkfun Weather Meters: 
-    http://www.sparkfun.com/products/8942
-*/
-#include <mbed.h>
-#include "WindVane.h"
-
-
-#define REV_PER_SECOND_TO_KMPH  2.4f
-#define PARALLEL_R(R1, R2) (((R1) * (R2)) / ((R1) + (R2)))
-#define ARRAY_SIZE(X) (sizeof(X)/sizeof(X[0]))
-
-struct SDescription
-{
-    const char* DirectionString;
-    float       DirectionAngle;
-    float       SensorResistance;
-};
-
-
-static SDescription g_WindVaneDescriptionTable[16] = {
-    { "North",            0.0f,  33.0f * 1000.0f },
-    { "North North East", 22.5f, PARALLEL_R(33.0f * 1000.0f, 8.2f * 1000.0f) },
-    { "North East",       45.0f, 8.2f * 1000.0f },
-    { "East North East",  67.5f, PARALLEL_R(8.2f * 1000.0f, 1000.0f) },
-    { "East",             90.0f, 1000.0f },
-    { "East South East",  112.5f, PARALLEL_R(1000.0f, 2.2f * 1000.0f) },
-    { "South East",       135.0f, 2.2f * 1000.0f },
-    { "South South East", 157.5f, PARALLEL_R(2.2f * 1000.0f, 3.9f * 1000.0f) },
-    { "South",            180.0f, 3.9f * 1000.0f },
-    { "South South West", 202.5f, PARALLEL_R(3.9f * 1000.0f, 16.0f * 1000.0f) },
-    { "South West",       225.0f, 16.0f * 1000.0f },
-    { "West South West",  247.5f, PARALLEL_R(16.0f * 1000.0f, 120.0f * 1000.0f) },
-    { "West",             270.0f, 120.0f * 1000.0f },
-    { "West North West",  292.5f, PARALLEL_R(120.0f * 1000.0f, 64.9f * 1000.0f) },
-    { "North West",       315.0f, 64.9f * 1000.0f },
-    { "North North West", 337.5f, PARALLEL_R(64.9f * 1000.0f, 33.0f * 1000.0f) }
-};
-
-
-CWindVane::CWindVane(PinName WindVanePin, float WindVaneSeriesResistance)
-    : m_WindVaneAnalogIn(WindVanePin)
-{
-    for (size_t i = 0 ; i < ARRAY_SIZE(g_WindVaneDescriptionTable) ; i++)
-    {
-        SDescription* pDescription = &g_WindVaneDescriptionTable[i];
-
-        m_WindVaneVoltageTable[i] = pDescription->SensorResistance /
-                                    (pDescription->SensorResistance + WindVaneSeriesResistance);
-    }
-}
-
-const char* CWindVane::GetWindDirectionAsString()
-{
-    return g_WindVaneDescriptionTable[DetermineWindDirectionIndex()].DirectionString;
-}
-
-float CWindVane::GetWindDirectionAsAngle()
-{
-    return g_WindVaneDescriptionTable[DetermineWindDirectionIndex()].DirectionAngle;
-}
-
-size_t CWindVane::DetermineWindDirectionIndex()
-{
-    float WindVaneSensorVoltage = m_WindVaneAnalogIn.read();
-
-    // Default to the first entry being closest.
-    size_t ClosestIndex = 0;
-    float  ClosestDelta = fabs(m_WindVaneVoltageTable[0] - WindVaneSensorVoltage);
-    
-    // Walk the rest of the entries to see if there is another which is closer.
-    for (size_t i = 1 ; i < ARRAY_SIZE(m_WindVaneVoltageTable) ; i++)
-    {
-        float Delta = fabs(m_WindVaneVoltageTable[i] - WindVaneSensorVoltage);
-        if (Delta < ClosestDelta)
-        {
-            ClosestDelta = Delta;
-            ClosestIndex = i;
-        }
-    }
-    
-    return ClosestIndex;
-}