grove: split code base for grove sensors into individual files

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/grove/grovetemp.cxx

@@ -0,0 +1,66 @@
+/*
+ * Authors: Brendan Le Foll <brendan.le.foll@intel.com>
+ *          Mihai Tudor Panu <mihai.tudor.panu@intel.com>
+ *          Sarah Knepper <sarah.knepper@intel.com>
+ * Copyright (c) 2014 - 2016 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <iostream>
+#include <string>
+#include <stdexcept>
+
+#include "grovetemp.hpp"
+#include "math.h"
+
+using namespace upm;
+
+GroveTemp::GroveTemp(unsigned int pin, float scale)
+{
+    if ( !(m_aio = mraa_aio_init(pin)) ) {
+        throw std::invalid_argument(std::string(__FUNCTION__) +
+                                    ": mraa_aio_init() failed, invalid pin?");
+        return;
+    }
+    m_name = "Temperature Sensor";
+    m_scale = scale;
+}
+
+GroveTemp::~GroveTemp()
+{
+    mraa_aio_close(m_aio);
+}
+
+int GroveTemp::value ()
+{
+    float a = (float) mraa_aio_read(m_aio);
+    if (a == -1.0) return -1;
+    // Apply scale factor after error check
+    a *= m_scale;
+    float r = (float)(1023.0-a)*10000.0/a;
+    float t = 1.0/(log(r/10000.0)/3975.0 + 1.0/298.15)-273.15;
+    return (int) round(t);
+}
+
+float GroveTemp::raw_value()
+{
+    return (float) mraa_aio_read(m_aio);
+}