ppd42ns: C implementation; C++ wraps C

Signed-off-by: Jon Trulson <jtrulson@ics.com>

examples/c++/ppd42ns.cxx

@@ -33,31 +33,34 @@ int shouldRun = true;
 
 void sig_handler(int signo)
 {
-	if (signo == SIGINT)
+    if (signo == SIGINT)
-		shouldRun = false;
+        shouldRun = false;
 }
 
 
 int main ()
 {
-	signal(SIGINT, sig_handler);
+    signal(SIGINT, sig_handler);
 
 //! [Interesting]
-	// Instantiate a dust sensor on GPIO pin D8
+    // Instantiate a dust sensor on GPIO pin D8
-	upm::PPD42NS* dust = new upm::PPD42NS(8);
+    upm::PPD42NS* dust = new upm::PPD42NS(8);
-	upm::dustData data;
+    ppd42ns_dust_data data;
-	cout << "This program will give readings every 30 seconds until you stop it" << endl;
+    cout << "This program will give readings every 30 seconds until "
-	while (shouldRun)
+         << "you stop it"
-	{
+         << endl;
-		data = dust->getData();
+    while (shouldRun)
-		cout << "Low pulse occupancy: " << data.lowPulseOccupancy << endl;
+    {
-		cout << "Ratio: " << data.ratio << endl;
+        data = dust->getData();
-		cout << "Concentration: " << data.concentration << endl;
+        cout << "Low pulse occupancy: " << data.lowPulseOccupancy << endl;
-	}
+        cout << "Ratio: " << data.ratio << endl;
+        cout << "Concentration: " << data.concentration << endl;
+        cout << endl;
+    }
 //! [Interesting]
 
-	cout << "Exiting" << endl;
+    cout << "Exiting" << endl;
 
-	delete dust;
+    delete dust;
-	return 0;
+    return 0;
 }

examples/c/CMakeLists.txt

@@ -132,6 +132,7 @@ add_example (linefinder)
 add_example (uln200xa)
 add_example (mma7660)
 add_example (buzzer)
+add_example (ppd42ns)
 
 # Custom examples
 add_custom_example (nmea_gps_i2c-example-c nmea_gps_i2c.c nmea_gps)

examples/c/ppd42ns.c

@@ -0,0 +1,66 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 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 <unistd.h>
+#include <stdio.h>
+#include <signal.h>
+
+#include <ppd42ns.h>
+
+int shouldRun = true;
+
+void sig_handler(int signo)
+{
+    if (signo == SIGINT)
+        shouldRun = false;
+}
+
+
+int main()
+{
+    signal(SIGINT, sig_handler);
+
+//! [Interesting]
+    // Instantiate a dust sensor on GPIO pin D8
+    ppd42ns_context dust = ppd42ns_init(8);
+
+    ppd42ns_dust_data data;
+    printf("This program will give readings every 30 seconds until "
+           "you stop it\n");
+
+    while (shouldRun)
+    {
+        data = ppd42ns_get_data(dust);
+        printf("Low pulse occupancy: %d\n", data.lowPulseOccupancy);
+        printf("Ratio: %f\n", data.ratio);
+        printf("Concentration: %f\n\n", data.concentration);
+    }
+
+    printf("Exiting...\n");
+
+    ppd42ns_close(dust);
+
+//! [Interesting]
+    return 0;
+}

examples/java/PPD42NSSample.java

@@ -24,22 +24,22 @@
 
 public class PPD42NSSample {
 
-	public static void main(String[] args) throws InterruptedException {
+    public static void main(String[] args) throws InterruptedException {
-		// ! [Interesting]
+        // ! [Interesting]
-		// Instantiate a dust sensor on GPIO pin D8
+        // Instantiate a dust sensor on GPIO pin D8
-		upm_ppd42ns.PPD42NS dust = new upm_ppd42ns.PPD42NS(8);
+        upm_ppd42ns.PPD42NS dust = new upm_ppd42ns.PPD42NS(8);
-		upm_ppd42ns.dustData data;
+        upm_ppd42ns.ppd42ns_dust_data data;
 
-		System.out.println("This program will give readings every 30 seconds until you stop it");
+        System.out.println("This program will give readings every 30 seconds until you stop it");
 
-		while (true) {
+        while (true) {
-			data = dust.getData();
+            data = dust.getData();
 
-			System.out.println("Low pulse occupancy: " + data.getLowPulseOccupancy());
+            System.out.println("Low pulse occupancy: " + data.getLowPulseOccupancy());
-			System.out.println("Ratio:  " + data.getRatio());
+            System.out.println("Ratio: " + data.getRatio());
-			System.out.println("Concentration: " + data.getConcentration());
+            System.out.println("Concentration: " + data.getConcentration());
-		}
+        }
-		// ! [Interesting]
+        // ! [Interesting]
-	}
+    }
 
-}
+}

src/ppd42ns/CMakeLists.txt

@@ -1,5 +1,9 @@
-set (libname "ppd42ns")
+upm_mixed_module_init (NAME ppd42ns
-set (libdescription "Ppd42ns dust sensor module")
+    DESCRIPTION "PPD42NS Dust Sensor"
-set (module_src ${libname}.cxx)
+    C_HDR ppd42ns.h ppd42ns_data.h
-set (module_hpp ${libname}.hpp)
+    C_SRC ppd42ns.c
-upm_module_init("-lrt")
+    CPP_HDR ppd42ns.hpp
+    CPP_SRC ppd42ns.cxx
+    CPP_WRAPS_C
+    REQUIRES mraa)
+target_link_libraries(${libnamec} m)

src/ppd42ns/javaupm_ppd42ns.i

@@ -1,11 +1,12 @@
 %module javaupm_ppd42ns
 %include "../upm.i"
 
+%include "ppd42ns_data.h"
+%include "ppd42ns.hpp"
 %{
     #include "ppd42ns.hpp"
 %}
 
-%include "ppd42ns.hpp"
 
 %pragma(java) jniclasscode=%{
     static {
@@ -16,4 +17,4 @@
             System.exit(1);
         }
     }
-%}
+%}

src/ppd42ns/jsupm_ppd42ns.i

@@ -1,8 +1,9 @@
 %module jsupm_ppd42ns
 %include "../upm.i"
 
+%include "ppd42ns_data.h"
+%include "ppd42ns.hpp"
 %{
     #include "ppd42ns.hpp"
 %}
 
-%include "ppd42ns.hpp"

src/ppd42ns/ppd42ns.c

@@ -0,0 +1,167 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * Rewritten Based on original C++ driver written by:
+ * Author: Zion Orent <sorent@ics.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 <assert.h>
+#include <stddef.h>
+#include <stdio.h>
+
+#include <upm_math.h>
+#include <upm_utilities.h>
+
+#include "ppd42ns.h"
+
+// Returns the amount of time it takes a pin to go from HIGH to LOW or
+// from LOW to HIGH
+static uint32_t ppd42ns_pulse_in(const ppd42ns_context dev,
+                                 bool high_low_value);
+
+ppd42ns_context ppd42ns_init(int pin)
+{
+    ppd42ns_context dev =
+        (ppd42ns_context)malloc(sizeof(struct _ppd42ns_context));
+
+    if (!dev)
+        return NULL;
+
+    dev->gpio = NULL;
+
+    // make sure MRAA is initialized
+    int mraa_rv;
+    if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
+    {
+        printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv);
+        ppd42ns_close(dev);
+        return NULL;
+    }
+
+    // MRAA contexts...
+    if ( !(dev->gpio = mraa_gpio_init(pin)) )
+    {
+        printf("%s: mraa_gpio_init() failed\n",
+               __FUNCTION__);
+        ppd42ns_close(dev);
+        return NULL;
+    }
+
+    mraa_gpio_dir(dev->gpio, MRAA_GPIO_IN);
+
+    return dev;
+}
+
+void ppd42ns_close(ppd42ns_context dev)
+{
+    assert(dev != NULL);
+
+    if (dev->gpio)
+        mraa_gpio_close(dev->gpio);
+}
+
+ppd42ns_dust_data ppd42ns_get_data(const ppd42ns_context dev)
+{
+    assert(dev != NULL);
+
+    ppd42ns_dust_data data;
+
+    // in ms, 30 seconds
+    const int pulse_check_time = 30000;
+    // loop timer
+    upm_clock_t max_loop_time;
+
+    unsigned int low_pulse_occupancy = 0;
+
+    upm_clock_init(&max_loop_time);
+
+    do {
+        low_pulse_occupancy += ppd42ns_pulse_in(dev, 0);
+    } while (upm_elapsed_ms(&max_loop_time) < pulse_check_time);
+
+    // Store dust data
+    // Integer percentage 0=>100
+    double ratio = (float)low_pulse_occupancy
+        / ((float)pulse_check_time * 10.0);
+
+     // using spec sheet curve
+    double concentration = (1.1 * pow(ratio,3)) - (3.8 * pow(ratio, 2))
+        + (520 * ratio) + 0.62;
+
+    data.lowPulseOccupancy = low_pulse_occupancy;
+    data.ratio = ratio;
+    data.concentration = concentration;
+
+    return data;
+}
+
+
+// Mimicking Arduino's pulseIn function
+// return how long it takes a pin to go from HIGH to LOW or LOW to HIGH
+static uint32_t ppd42ns_pulse_in(const ppd42ns_context dev,
+                                 bool high_low_value)
+{
+    assert(dev != NULL);
+
+    // we run for no more than 1 second at a time
+    upm_clock_t max_time;
+    upm_clock_t pulse_time;
+    uint32_t total_pulse_time = 0;
+
+    upm_clock_init(&max_time);
+    bool pin_level;
+    bool is_timing = false;
+
+    do {
+        pin_level = (bool)mraa_gpio_read(dev->gpio);
+
+        if (!is_timing && pin_level == high_low_value)
+        {
+            // level is desired level, but not currently timing
+            upm_clock_init(&pulse_time);
+            is_timing = true;
+        }
+        else if (is_timing && pin_level != high_low_value)
+        {
+            // we started timing, but level changed
+            total_pulse_time += upm_elapsed_us(&pulse_time);
+            is_timing = false;
+        }
+        else
+        {
+            // not timing and/or level is not equal to desired level
+            // so we "wait".
+            upm_delay_us(10);
+        }
+    } while (upm_elapsed_ms(&max_time) < 1000); // 1 second
+
+    if (is_timing)
+    {
+        // if we were still timing when the loop expired, add the
+        // accumulated time.
+        total_pulse_time += upm_elapsed_us(&pulse_time);
+    }
+
+    return total_pulse_time;
+}

src/ppd42ns/ppd42ns.cxx

@@ -1,6 +1,7 @@
 /*
  * Author: Zion Orent <sorent@ics.com>
- * Copyright (c) 2014 Intel Corporation.
+ *         Jon Trulson <jtrulson@ics.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
@@ -25,113 +26,26 @@
 #include <iostream>
 #include <string>
 #include <stdexcept>
-#include <stddef.h>
+
-#include <stdio.h>
-#include <time.h>
-#include <math.h>
-#include <sys/sysinfo.h>
 #include "ppd42ns.hpp"
 
 using namespace upm;
 
-PPD42NS::PPD42NS(int pin)
+PPD42NS::PPD42NS(int pin) :
+    m_ppd42ns(ppd42ns_init(pin))
 {
-    if ( !(m_gpio = mraa_gpio_init(pin)) ) 
+    if (!m_ppd42ns)
-      {
+        throw std::runtime_error(std::string(__FUNCTION__) +
-        throw std::invalid_argument(std::string(__FUNCTION__) +
+                                    ": ppd42ns_init() failed");
-                                    ": mraa_gpio_init() failed, invalid pin?");
-        return;
-      }
-
-    mraa_gpio_dir(m_gpio, MRAA_GPIO_IN);
 }
 
 PPD42NS::~PPD42NS()
 {
-    mraa_gpio_close(m_gpio);
+    ppd42ns_close(m_ppd42ns);
 }
 
-dustData PPD42NS::getData()
+ppd42ns_dust_data PPD42NS::getData()
 {
-	dustData data;
+    return ppd42ns_get_data(m_ppd42ns);
-	struct timespec printData_start={0,0};
-	struct timespec printData_now={0,0};
-	clock_gettime(CLOCK_MONOTONIC, &printData_start);
-	clock_gettime(CLOCK_MONOTONIC, &printData_now);
-	double low_pulse_occupancy = 0;
-	double pulse_check_time = 30;
-	
-	// Keep reading dust data until 30 seconds have passed
-	double start_time, end_time;
-	while (m_timediff(printData_start, printData_now) < pulse_check_time)
-	{
-		start_time = m_timediff(printData_start, printData_now);
-		end_time = pulse_check_time - start_time;
-		low_pulse_occupancy += pulseIn_polyfill(0, end_time);
-		clock_gettime(CLOCK_MONOTONIC, &printData_now);
-	}
-
-	// Store dust data
-	double ratio = low_pulse_occupancy / (pulse_check_time * 1000 * 10.0);  // Integer percentage 0=>100
-	double concentration = (1.1 * pow(ratio,3)) - (3.8 * pow(ratio, 2)) + (520 * ratio) + 0.62; // using spec sheet curve
-	data.lowPulseOccupancy = (int)low_pulse_occupancy;
-	data.ratio = ratio;
-	data.concentration = concentration;
-
-	return data;
 }
 
-
-// Mimicking Arduino's pulseIn function
-//	return how long it takes a pin to go from HIGH to LOW or LOW to HIGH
-double PPD42NS::pulseIn_polyfill(bool high_low_value, double end_time)
-{
-	struct timespec pulseIn_start={0,0};
-	struct timespec pulseIn_now={0,0};
-	struct timespec pulsetime_start={0,0};
-	struct timespec pulsetime_end={0,0};
-
-	int pin_val = 5; // some non-zero, non-1 number
-	bool started_timing = false;
-	bool ended_timing = false;
-	clock_gettime(CLOCK_MONOTONIC, &pulseIn_start);
-
-	// run through this loop until either:
-	//	a) we detect a change in pulse
-	//	b) we've hit 30 seconds
-	while (!ended_timing && (m_timediff(pulseIn_start, pulseIn_now) < end_time))
-	{
-		pin_val = (bool)mraa_gpio_read(m_gpio);
-		if (pin_val == high_low_value && !started_timing)
-		{
-			clock_gettime(CLOCK_MONOTONIC, &pulsetime_start);
-			started_timing = true;
-			//std::cout << "Started counting pulse change" << std::endl;
-			usleep(50);
-		}
-		else if (started_timing && pin_val != high_low_value)
-		{
-			clock_gettime(CLOCK_MONOTONIC, &pulsetime_end);
-			ended_timing = true;
-			//std::cout << "Ended counting pulse change" << (m_timediff(pulseIn_start, pulseIn_now)) << std::endl;
-		}
-		else
-			usleep(50);
-		clock_gettime(CLOCK_MONOTONIC, &pulseIn_now);
-	}
-
-	double low_pulse_occupancy = 0;
-
-	// if we ended due to detecting a pulse change and not due to hitting 30 seconds
-	if (started_timing && ended_timing)
-		low_pulse_occupancy = m_timediff(pulsetime_start, pulsetime_end);
-	//std::cout << "Low pulse occupancy is " << low_pulse_occupancy << " seconds" << std::endl;
-
-	return (low_pulse_occupancy * 1000000); // convert to microseconds
-}
-
-double PPD42NS::m_timediff(timespec time1, timespec time2)
-{
-	return ((double)time2.tv_sec + 1.0e-9*time2.tv_nsec) - 
-			((double)time1.tv_sec + 1.0e-9*time1.tv_nsec);
-}

src/ppd42ns/ppd42ns.h

@@ -0,0 +1,82 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * Based on original C++ driver written by:
+ * Author: Zion Orent <sorent@ics.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.
+ */
+#pragma once
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <upm.h>
+
+#include <mraa/gpio.h>
+#include <ppd42ns_data.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    /**
+     * @file ppd42ns.h
+     * @library ppd42ns
+     * @brief C API for the ppd42ns driver
+     *
+     * @include ppd42ns.c
+     */
+
+    /**
+     * Device context
+     */
+    typedef struct _ppd42ns_context {
+        mraa_gpio_context gpio;
+
+    } *ppd42ns_context;
+
+    /**
+     * PPD42NS initialization
+     *
+     * @param pin Digital pin to use
+     * @return ppd42ns device context
+     */
+    ppd42ns_context ppd42ns_init(int pin);
+
+    /**
+     * PPD42NS close
+     *
+     * @param dev Device context.
+     */
+    void ppd42ns_close(ppd42ns_context dev);
+
+    /**
+     * Prints dust concentration
+     *
+     * @param dev Device context.
+     * @return ppd42ns_dust_data Contains data from the dust sensor
+     */
+    ppd42ns_dust_data ppd42ns_get_data(const ppd42ns_context dev);
+
+#ifdef __cplusplus
+}
+#endif

src/ppd42ns/ppd42ns.hpp

@@ -1,6 +1,7 @@
 /*
  * Author: Zion Orent <sorent@ics.com>
- * Copyright (c) 2014 Intel Corporation.
+ *         Jon Trulson <jtrulson@ics.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
@@ -24,70 +25,58 @@
 #pragma once
 
 #include <string>
-#include <time.h>
+#include <ppd42ns.h>
-#include <mraa/aio.h>
 
 namespace upm {
 
-typedef struct
-{
-	int lowPulseOccupancy;
-	double ratio;
-	double concentration;
-} dustData;
-
-  /**
-   * @brief PPD42NS Dust Sensor library
-   * @defgroup ppd42ns libupm-ppd42ns
-   * @ingroup seeed gpio other eak
-   */
-  /**
-   * @library ppd42ns
-   * @sensor ppd42ns
-   * @comname PPD42NS Dust Sensor
-   * @altname Grove Dust Sensor
-   * @type other
-   * @man seeed
-   * @web http://www.seeedstudio.com/wiki/Grove_-_Dust_Sensor
-   * @con gpio
-   * @kit eak
-   *
-   * @brief API for the PPD42NS Dust Sensor
-   *
-   * UPM module for the PPD42NS dust sensor
-   *
-   * @image html ppd42ns.jpg
-   * @snippet ppd42ns.cxx Interesting
-   */
-  class PPD42NS {
-  public:
     /**
-     * PPD42NS constructor
+     * @brief PPD42NS Dust Sensor library
+     * @defgroup ppd42ns libupm-ppd42ns
+     * @ingroup seeed gpio other eak
+     */
+    /**
+     * @library ppd42ns
+     * @sensor ppd42ns
+     * @comname PPD42NS Dust Sensor
+     * @altname Grove Dust Sensor
+     * @type other
+     * @man seeed
+     * @web http://www.seeedstudio.com/wiki/Grove_-_Dust_Sensor
+     * @con gpio
+     * @kit eak
      *
-     * @param pin Digital pin to use
+     * @brief API for the PPD42NS Dust Sensor
-     */
-    PPD42NS(int pin);
-    /**
-     * PPD42NS destructor
-     */
-    ~PPD42NS();
-    /**
-     * Prints dust concentration
      *
-     * @return struct dustData  Contains data from the dust sensor
+     * UPM module for the PPD42NS dust sensor
+     *
+     * @image html ppd42ns.jpg
+     * @snippet ppd42ns.cxx Interesting
      */
-     dustData getData();
+    class PPD42NS {
+    public:
 
-  private:
+        /**
-        mraa_gpio_context m_gpio;
+         * PPD42NS constructor
-		/**
+         *
-		 * Returns the amount of time it takes a pin to go from HIGH to LOW or from LOW to HIGH
+         * @param pin Digital pin to use
-		 *
+         */
-		 * @param highLowValue int Do we measure movements from HIGH to LOW or from LOW to HIGH? highLowValue is the "from" value
+        PPD42NS(int pin);
-		 */
+
-		double pulseIn_polyfill(bool highLowValue, double endTime);
+        /**
-		double m_timediff(timespec time1, timespec time2);
+         * PPD42NS destructor
-	};
+         */
+        ~PPD42NS();
+
+        /**
+         * Prints dust concentration
+         *
+         * @return struct ppd42ns_dust_data Contains data from the dust sensor
+         */
+        ppd42ns_dust_data getData();
+
+    private:
+        ppd42ns_context m_ppd42ns;
+    };
 }
 
 

src/ppd42ns/ppd42ns_data.h

@@ -0,0 +1,44 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * Based on original C++ driver written by:
+ * Author: Zion Orent <sorent@ics.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.
+ */
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    // This is a data struct used by the ppd42ns (dust sensor) driver.
+    typedef struct
+    {
+	unsigned int lowPulseOccupancy;
+	double ratio;
+	double concentration;
+    } ppd42ns_dust_data;
+
+#ifdef __cplusplus
+}
+#endif

src/ppd42ns/pyupm_ppd42ns.i

@@ -5,6 +5,7 @@
 
 %feature("autodoc", "3");
 
+%include "ppd42ns_data.h"
 %include "ppd42ns.hpp"
 %{
     #include "ppd42ns.hpp"