guvas12d: C implementation; FTI; C++ wraps C

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

examples/c++/guvas12d.cxx

@@ -33,7 +33,6 @@ bool shouldRun = true;
 
 // analog voltage, usually 3.3 or 5.0
 #define GUVAS12D_AREF   5.0
-#define SAMPLES_PER_QUERY 1024
 
 void sig_handler(int signo)
 {
@@ -46,8 +45,8 @@ int main()
     signal(SIGINT, sig_handler);
 
 //! [Interesting]
-  // The was tested with the Grove UV Sensor module.
-  // It has a sensing range from between 200-400nm.  It's strongest
+    // This was tested with the Grove UV Sensor module.
+    // It has a sensing range from between 240-370nm.  It's strongest
     // response is around 320-360nm.
 
     // Instantiate a GUVAS12D on analog pin A0
@@ -57,9 +56,10 @@ int main()
 
     while (shouldRun)
     {
-      cout << "AREF: " << GUVAS12D_AREF 
-           << ", Voltage value (higher means more UV): " 
-           << volts->value(GUVAS12D_AREF, SAMPLES_PER_QUERY) << endl;
+        cout << "Volts: " << volts->volts()
+             << ", Intensity: " << volts->intensity()
+             << " mW/m^2"
+             << endl;
 
         sleep(1);
     }

examples/c/CMakeLists.txt

@@ -133,6 +133,7 @@ add_example (uln200xa)
 add_example (mma7660)
 add_example (buzzer)
 add_example (ppd42ns)
+add_example (guvas12d)
 
 # Custom examples
 add_custom_example (nmea_gps_i2c-example-c nmea_gps_i2c.c nmea_gps)

examples/c/guvas12d.c

@@ -0,0 +1,89 @@
+/*
+ * 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 <upm_utilities.h>
+#include <guvas12d.h>
+
+bool shouldRun = true;
+
+// analog voltage, usually 3.3 or 5.0
+#define GUVAS12D_AREF   5.0
+
+void sig_handler(int signo)
+{
+    if (signo == SIGINT)
+        shouldRun = false;
+}
+
+int main()
+{
+    signal(SIGINT, sig_handler);
+
+//! [Interesting]
+    // This was tested with the Grove UV Sensor module.
+    // It has a sensing range from between 240-370nm.  It's strongest
+    // response is around 320-360nm.
+
+    // Instantiate a GUVAS12D on analog pin A0
+    guvas12d_context uv = guvas12d_init(0, GUVAS12D_AREF);
+
+    if (!uv)
+    {
+        printf("guvas12d_init() failed\n");
+        return 1;
+    }
+
+    // The higher the voltage the more intense the UV radiation.
+    while (shouldRun)
+    {
+        float volts = 0;
+        float intensity = 0;
+
+        if (guvas12d_get_volts(uv, &volts))
+        {
+            printf("guvas12d_get_volts() failed\n");
+            return 1;
+        }
+
+        if (guvas12d_get_intensity(uv, &intensity))
+        {
+            printf("guvas12d_get_intensity() failed\n");
+            return 1;
+        }
+
+        printf("Volts: %f, Intensity %f mW/m^2\n", volts, intensity);
+
+        upm_delay(1);
+    }
+
+    printf("Exiting\n");
+
+    guvas12d_close(uv);
+//! [Interesting]
+    return 0;
+}

examples/java/GUVAS12DSample.java

@@ -1,6 +1,7 @@
 /*
  * Author: Stefan Andritoiu <stefan.andritoiu@intel.com>
- * Copyright (c) 2015 Intel Corporation.
+ *         Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015-2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -25,18 +26,20 @@
 public class GUVAS12DSample {
     // analog voltage, usually 3.3 or 5.0
     private static final float GUVAS12D_AREF = 5;
-	private static final int SAMPLES_PER_QUERY = 1024;
 
     public static void main(String[] args) throws InterruptedException {
         // ! [Interesting]
-		// Instantiate a GUVAS12D on analog pin A3
-		upm_guvas12d.GUVAS12D volts = new upm_guvas12d.GUVAS12D(3);
+        // Instantiate a GUVAS12D on analog pin A0
+        upm_guvas12d.GUVAS12D volts = new upm_guvas12d.GUVAS12D(0,
+                                                                GUVAS12D_AREF);
 
-		while (true) {
-			float value = volts.value(GUVAS12D_AREF, SAMPLES_PER_QUERY);
-
-			System.out.println("AREF: " + GUVAS12D_AREF
-					+ ", Voltage value (higher means more UV): " + value);
+        while (true)
+        {
+            System.out.println("Volts: "
+                               + volts.volts()
+                               + ", Intensity: "
+                               + volts.intensity()
+                               + " mW/m^2");
 
             Thread.sleep(1000);
         }

examples/javascript/guvas12d.js

@@ -1,6 +1,7 @@
 /*
 * Author: Zion Orent <zorent@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
@@ -24,27 +25,23 @@
 
 var UVSensor = require('jsupm_guvas12d');
 
-// Instantiate a UV sensor on analog pin A0
-var myUVSensor = new UVSensor.GUVAS12D(0);
-
 // analog voltage, usually 3.3 or 5.0
 var g_GUVAS12D_AREF = 5.0;
-var g_SAMPLES_PER_QUERY = 1024;
+
+// Instantiate a UV sensor on analog pin A0
+var myUVSensor = new UVSensor.GUVAS12D(0, g_GUVAS12D_AREF);
 
 setInterval(function()
 {
-	var outputStr = "AREF: " + g_GUVAS12D_AREF 
-					+ ", Voltage value (higher means more UV): "
-					+ roundNum(myUVSensor.value(g_GUVAS12D_AREF, g_SAMPLES_PER_QUERY), 6);
+    var outputStr = "Volts: "
+        + myUVSensor.volts()
+	+ ", Intensity: "
+        + myUVSensor.intensity()
+        + " mW/m^2";
+
     console.log(outputStr);
 }, 1000);
 
-function roundNum(num, decimalPlaces)
-{
-	var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
-	return (Math.round((num + extraNum) * (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces));
-}
-
 // Print message when exiting
 process.on('SIGINT', function()
 {

examples/python/guvas12d.py

@@ -1,6 +1,7 @@
 #!/usr/bin/python
 # Author: Zion Orent <zorent@ics.com>
-# Copyright (c) 2015 Intel Corporation.
+#         Jon Trulson <jtrulson@ics.com>
+# Copyright (c) 2015-2016 Intel Corporation.
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,12 +27,11 @@ import time, sys, signal, atexit
 from upm import pyupm_guvas12d as upmUV
 
 def main():
-    # Instantiate a UV sensor on analog pin A0
-    myUVSensor = upmUV.GUVAS12D(0);
-
     # analog voltage, usually 3.3 or 5.0
     GUVAS12D_AREF = 5.0;
-    SAMPLES_PER_QUERY = 1024;
+
+    # Instantiate a UV sensor on analog pin A0
+    myUVSensor = upmUV.GUVAS12D(0, GUVAS12D_AREF);
 
     ## Exit handlers ##
     # This function stops python from printing a stacktrace when you hit control-C
@@ -48,10 +48,8 @@ def main():
     signal.signal(signal.SIGINT, SIGINTHandler)
 
     while(1):
-        s = ("AREF:  {0}, "
-        "Voltage value (higher means more UV): "
-        "{1}".format(GUVAS12D_AREF,
-        myUVSensor.value(GUVAS12D_AREF, SAMPLES_PER_QUERY)))
+        s = ("Volts:  {0}, Intensity: {1} mW/m^2".format(myUVSensor.volts(),
+                                                         myUVSensor.intensity()))
         print(s)
         time.sleep(1)
 

src/guvas12d/CMakeLists.txt

@@ -1,5 +1,9 @@
-set (libname "guvas12d")
-set (libdescription "Guvas12d UV sensor module")
-set (module_src ${libname}.cxx)
-set (module_hpp ${libname}.hpp)
-upm_module_init()
+upm_mixed_module_init (NAME guvas12d
+    DESCRIPTION "Guvas12d analog UV sensor"
+    C_HDR guvas12d.h
+    C_SRC guvas12d.c
+    CPP_HDR guvas12d.hpp
+    CPP_SRC guvas12d.cxx
+    FTI_SRC guvas12d_fti.c
+    CPP_WRAPS_C
+    REQUIRES mraa)

src/guvas12d/guvas12d.c

@@ -0,0 +1,128 @@
+/*
+ * 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 <assert.h>
+#include <string.h>
+#include <upm_utilities.h>
+
+#include "guvas12d.h"
+
+guvas12d_context guvas12d_init(int pin, float aref)
+{
+    guvas12d_context dev =
+        (guvas12d_context)malloc(sizeof(struct _guvas12d_context));
+
+    if (!dev)
+        return NULL;
+
+    memset((void *)dev, 0, sizeof(struct _guvas12d_context));
+
+    // 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);
+        guvas12d_close(dev);
+        return NULL;
+    }
+
+    // initialize the MRAA context
+
+    if (!(dev->aio = mraa_aio_init(pin)))
+    {
+        printf("%s: mraa_aio_init failed.\n", __FUNCTION__);
+        guvas12d_close(dev);
+
+        return NULL;
+    }
+
+    dev->ares = (float)((1 << mraa_aio_get_bit(dev->aio)) - 1);
+    dev->aref = aref;
+    dev->scale = 1.0;
+    dev->offset = 0.0;
+
+    return dev;
+}
+
+void guvas12d_close(guvas12d_context dev)
+{
+    assert(dev != NULL);
+
+    if (dev->aio)
+        mraa_aio_close(dev->aio);
+
+    free(dev);
+}
+
+upm_result_t guvas12d_get_volts(const guvas12d_context dev, float *volts)
+{
+    assert(dev != NULL);
+
+    int val;
+
+    val = mraa_aio_read(dev->aio);
+    if (val < 0)
+    {
+        printf("%s: mraa_aio_read() failed\n", __FUNCTION__);
+        return UPM_ERROR_OPERATION_FAILED;
+    }
+    *volts = (float)val * (dev->aref / dev->ares);
+
+    return UPM_SUCCESS;
+}
+
+upm_result_t guvas12d_get_intensity(const guvas12d_context dev,
+                                    float *intensity)
+{
+    assert(dev != NULL);
+
+    float volts;
+    if (guvas12d_get_volts(dev, &volts))
+    {
+        printf("%s: guvas12d_get_volts() failed\n", __FUNCTION__);
+        return UPM_ERROR_OPERATION_FAILED;
+    }
+
+    // Seeed magic number 307.0
+    *intensity = volts * 307.0;
+
+    *intensity = *intensity * dev->scale + (dev->offset * dev->scale);
+
+    return UPM_SUCCESS;
+}
+
+void guvas12d_set_offset(const guvas12d_context dev, float offset)
+{
+    assert(dev != NULL);
+
+    dev->offset = offset;
+}
+
+void guvas12d_set_scale(const guvas12d_context dev, float scale)
+{
+    assert(dev != NULL);
+
+    dev->scale = scale;
+}

src/guvas12d/guvas12d.cxx

@@ -1,6 +1,6 @@
 /*
  * Author: Jon Trulson <jtrulson@ics.com>
- * Copyright (c) 2014 Intel Corporation.
+ * 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
@@ -31,36 +31,63 @@
 using namespace upm;
 using namespace std;
 
-GUVAS12D::GUVAS12D(int pin)
+GUVAS12D::GUVAS12D(int pin, float aref) :
+    m_guvas12d(guvas12d_init(pin, aref))
 {
-  if ( !(m_aio = mraa_aio_init(pin)) )
+    if (!m_guvas12d)
     {
-      throw std::invalid_argument(std::string(__FUNCTION__) +
-                                  ": mraa_aio_init() failed, invalid pin?");
+      throw std::runtime_error(std::string(__FUNCTION__) +
+                               ": guvas12d_init() failed");
       return;
     }
 }
 
 GUVAS12D::~GUVAS12D()
 {
-  mraa_aio_close(m_aio);
+    guvas12d_close(m_guvas12d);
 }
 
 float GUVAS12D::value(float aref, unsigned int samples)
 {
-  int val;
-  unsigned long sum = 0;
+    (void)(samples); // unused, this method is deprecated.
 
-  for (unsigned int i=0; i<samples; i++)
-    {
-      val = mraa_aio_read(m_aio);
-      if (val == -1) return -1;
-      sum += val;
-      usleep(2000);
+    // this is a hack, but this function should go away anyway
+    if (aref != m_guvas12d->aref)
+        m_guvas12d->aref = aref;
+
+    return volts();
 }
 
-  sum = sum / samples;
-  float volts = (float)sum * aref / 1024.0;
+float GUVAS12D::volts()
+{
+    float volts;
+    if (guvas12d_get_volts(m_guvas12d, &volts))
+    {
+      throw std::runtime_error(std::string(__FUNCTION__) +
+                               ": guvas12d_get_volts() failed");
+    }
 
     return volts;
 }
+
+float GUVAS12D::intensity()
+{
+    float i;
+    if (guvas12d_get_intensity(m_guvas12d, &i))
+    {
+      throw std::runtime_error(std::string(__FUNCTION__) +
+                               ": guvas12d_get_intensity() failed");
+    }
+
+    return i;
+}
+
+void GUVAS12D::setScale(float scale)
+{
+    guvas12d_set_scale(m_guvas12d, scale);
+}
+
+void GUVAS12D::setOffset(float offset)
+{
+    guvas12d_set_offset(m_guvas12d, offset);
+}

src/guvas12d/guvas12d.h

@@ -0,0 +1,108 @@
+/*
+ * 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.
+ */
+#pragma once
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <upm.h>
+#include <mraa/aio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    /**
+     * @file guvas12d.h
+     * @library guvas12d
+     * @brief C API for the guvas12d driver
+     *
+     * @include guvas12d.c
+     */
+
+    /**
+     * Device context
+     */
+    typedef struct _guvas12d_context {
+        mraa_aio_context    aio;
+
+        // ADC reference voltage
+        float               aref;
+        // ADC resolution
+        float               ares;
+
+        float               scale;
+        float               offset;
+    } *guvas12d_context;
+
+    /**
+     * GUVA-S12D UV sensor constructor
+     *
+     * @param pin Analog pin to use
+     */
+    guvas12d_context guvas12d_init(int pin, float aref);
+
+    /**
+     * GUVAS12D destructor
+     */
+    void guvas12d_close(guvas12d_context dev);
+
+    /**
+     * Gets the voltage value from the sensor
+     *
+     * @param volts Pointer to average voltage reading
+     * @return UPM status.
+     */
+    upm_result_t guvas12d_get_volts(const guvas12d_context dev, float *volts);
+
+    /**
+     * Gets the illumination intensity in mW/m^2
+     *
+     * @param volts Pointer to average voltage reading
+     * @return UPM status.
+     * @return illumination intensity in mW/m^2
+     */
+    upm_result_t guvas12d_get_intensity(const guvas12d_context dev,
+                                        float *intensity);
+
+    /**
+     * Set sensor offset.  This offset is applied to the illumination
+     * intensity value before scaling.  Default is 0.0.
+     *
+     * @param dev sensor context pointer
+     * @param offset Offset to apply.
+     */
+    void guvas12d_set_offset(const guvas12d_context dev, float offset);
+
+    /**
+     * Set sensor scale.  This offset is applied to the illumination
+     * intensity value before scaling.  Default is 1.0.
+     *
+     * @param dev sensor context pointer
+     * @param scale Scale to apply.
+     */
+    void guvas12d_set_scale(const guvas12d_context dev, float scale);
+
+#ifdef __cplusplus
+}
+#endif

src/guvas12d/guvas12d.hpp

@@ -1,6 +1,6 @@
 /*
  * Author: Jon Trulson <jtrulson@ics.com>
- * Copyright (c) 2014 Intel Corporation.
+ * 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
@@ -23,8 +23,7 @@
  */
 #pragma once
 
-#include <string>
-#include <mraa/aio.h>
+#include <guvas12d.h>
 
 namespace upm {
     /**
@@ -52,26 +51,68 @@ namespace upm {
      */
     class GUVAS12D {
     public:
+
         /**
          * GUVA-S12D UV sensor constructor
          *
          * @param pin Analog pin to use
+         * @param aref Analog reference voltage to use
          */
-    GUVAS12D(int pin);
+        GUVAS12D(int pin, float aref=5.0);
+
         /**
          * GUVAS12D destructor
          */
         ~GUVAS12D();
+
         /**
+         * @deprecated This method is being replaced by the volts()
+         * and illumination() methods.
+         *
          * Gets the average voltage value from the sensor
          *
          * @param aref Reference voltage in use (usually 5.0 V or 3.3 V)
-     * @param samples Number of samples to average over
+         * @param samples Number of samples to average over (currently
+         * ignored)
          * @return Average voltage reading
+         *
          */
         float value(float aref, unsigned int samples);
 
+        /**
+         * Gets the voltage value from the sensor
+         *
+         * @return Voltage reading
+         *
+         */
+        float volts();
+
+        /**
+         * Gets the computed illumination intensity from the sensor in
+         * mW/m^2.
+         *
+         * @return Intensity over the sensitive wavelengths in mW/m^2
+         *
+         */
+        float intensity();
+
+        /**
+         * Set sensor scale.  This scale is applied to the intensity value
+         * before the offset is applied.  Default is 1.0.
+         *
+         * @param scale Scale to apply.
+         */
+        void setScale(float scale);
+
+        /**
+         * Set sensor offset.  This offset is applied to the intensity
+         * value before scaling.  Default is 0.0.
+         *
+         * @param offset Offset to apply.
+         */
+        void setOffset(float offset);
+
     private:
-    mraa_aio_context m_aio;
+        guvas12d_context m_guvas12d;
     };
 }

src/guvas12d/guvas12d_fti.c

@@ -0,0 +1,119 @@
+/*
+ * 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 <string.h>
+#include <stdlib.h>
+
+#include "guvas12d.h"
+#include "fti/upm_sensor.h"
+#include "fti/upm_voltage.h"
+
+/**
+ * This file implements the Function Table Interface (FTI) for this sensor
+ */
+
+const char upm_guvas12d_name[] = "GUVAS12D";
+const char upm_guvas12d_description[] = "Analog UV sensor";
+const upm_protocol_t upm_guvas12d_protocol[] = {UPM_ANALOG};
+const upm_sensor_t upm_guvas12d_category[] = {UPM_VOLTAGE};
+
+// forward declarations
+void* upm_guvas12d_init_str(const char* protocol, const char* params);
+void upm_guvas12d_close(void* dev);
+const void* upm_guvas12d_get_ft(upm_sensor_t sensor_type);
+const upm_sensor_descriptor_t upm_guvas12d_get_descriptor();
+upm_result_t upm_guvas12d_set_offset(const void* dev, float offset);
+upm_result_t upm_guvas12d_set_scale(const void* dev, float scale);
+upm_result_t upm_guvas12d_get_value(const void* dev, float *value);
+
+/* This sensor implementes 2 function tables */
+/* 1. Generic base function table */
+static const upm_sensor_ft ft_gen =
+{
+    .upm_sensor_init_name = &upm_guvas12d_init_str,
+    .upm_sensor_close = &upm_guvas12d_close,
+    .upm_sensor_get_descriptor = &upm_guvas12d_get_descriptor
+};
+
+/* 2. VOLTAGE function table */
+static const upm_voltage_ft ft_voltage =
+{
+    .upm_voltage_set_offset = &upm_guvas12d_set_offset,
+    .upm_voltage_set_scale = &upm_guvas12d_set_scale,
+    .upm_voltage_get_value = &upm_guvas12d_get_value
+};
+
+const void* upm_guvas12d_get_ft(upm_sensor_t sensor_type)
+{
+    switch(sensor_type)
+    {
+        case UPM_SENSOR:
+            return &ft_gen;
+        case UPM_VOLTAGE:
+            return &ft_voltage;
+        default:
+            return NULL;
+    }
+}
+
+void* upm_guvas12d_init_str(const char* protocol, const char* params)
+{
+    return NULL;
+}
+
+void upm_guvas12d_close(void* dev)
+{
+    guvas12d_close((guvas12d_context)dev);
+}
+
+const upm_sensor_descriptor_t upm_guvas12d_get_descriptor()
+{
+    /* Fill in the descriptor */
+    upm_sensor_descriptor_t usd;
+    usd.name = upm_guvas12d_name;
+    usd.description = upm_guvas12d_description;
+    usd.protocol_size = 1;
+    usd.protocol = upm_guvas12d_protocol;
+    usd.category_size = 1;
+    usd.category = upm_guvas12d_category;
+
+    return usd;
+}
+
+upm_result_t upm_guvas12d_set_offset(const void* dev, float offset)
+{
+    guvas12d_set_offset((guvas12d_context)dev, offset);
+    return UPM_SUCCESS;
+}
+
+upm_result_t upm_guvas12d_set_scale(const void* dev, float scale)
+{
+    guvas12d_set_scale((guvas12d_context)dev, scale);
+    return UPM_SUCCESS;
+}
+
+upm_result_t upm_guvas12d_get_value(const void* dev, float *value)
+{
+    return guvas12d_get_volts((guvas12d_context)dev, value);
+}