examples: moved examples to new c++ subfolder

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

examples/c++/ldt0028.cxx

@@ -0,0 +1,90 @@
+/*
+ * Author: Sarah Knepper <sarah.knepper@intel.com>
+ * Copyright (c) 2014 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 <unistd.h>
+#include <iostream>
+#include <iomanip>
+#include <cmath>
+#include "ldt0028.h"
+
+int
+main(int argc, char **argv)
+{
+//! [Interesting]
+    const int NUMBER_OF_SECONDS = 10;
+    const int MICROSECONDS_PER_SECOND = 1000000;
+    const int SAMPLES_PER_SECOND = 50;
+    const int THRESHOLD = 100;
+
+    // Create the LDT0-028 Piezo Vibration Sensor object using AIO pin 0
+    upm::LDT0028* sensor = new upm::LDT0028(0);
+
+    // Read the signal every 20 milliseconds for 10 seconds
+    std::cout << "For the next " << NUMBER_OF_SECONDS << " seconds, " 
+              << SAMPLES_PER_SECOND << " samples will be taken every second." 
+              << std::endl << std::endl;
+    uint16_t* buffer = new uint16_t[NUMBER_OF_SECONDS * SAMPLES_PER_SECOND];
+    for (int i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
+        buffer[i] = (uint16_t) sensor->getSample();
+        usleep(MICROSECONDS_PER_SECOND / SAMPLES_PER_SECOND);
+    }
+
+    // Print the number of times the reading was greater than the threshold
+    int count = 0;
+    for (int i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
+        if (buffer[i] > THRESHOLD) {
+            count++;
+        }
+    }
+    std::cout << sensor->name() << " exceeded the threshold value of " <<
+        THRESHOLD << " a total of " << count << " times," << std::endl
+        << "out of a total of " << NUMBER_OF_SECONDS*SAMPLES_PER_SECOND 
+        << " readings." << std::endl << std::endl;
+
+    // Print a graphical representation of the average value sampled
+    // each second for the past 10 seconds, using a scale factor of 15
+    std::cout << "Now printing a graphical representation of the average reading "
+        << std::endl << "each second for the last " 
+        << NUMBER_OF_SECONDS << " seconds." << std::endl;
+    const int SCALE_FACTOR = 15;
+    for (int i=0; i < NUMBER_OF_SECONDS; i++) {
+        long sum = 0;
+        for (int j=0; j < SAMPLES_PER_SECOND; j++) {
+            sum += buffer[i*SAMPLES_PER_SECOND + j];
+        }
+        double average = (double) sum / (double) SAMPLES_PER_SECOND;
+        int stars_to_print = (int) round(average / SCALE_FACTOR);
+        std::cout << "(" << std::setw(4) << (int) round(average) << ") | ";
+        for (int j=0; j<stars_to_print; j++) {
+            std::cout << "*";
+        }
+        std::cout << std::endl;
+    }
+
+    // Delete the sensor object
+    delete sensor;
+//! [Interesting]
+
+    return 0;
+}