water: add C driver and example. C++ wraps C driver.

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

examples/c/CMakeLists.txt

@@ -119,6 +119,7 @@ add_example (led)
 add_example (ds18b20)
 add_example (dfrec)
 add_example (sht1x)
+add_example (water)
 
 # Custom examples
 add_custom_example (nmea_gps_i2c-example-c nmea_gps_i2c.c nmea_gps)

examples/c/dfrec.c

@@ -39,9 +39,9 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
     {
-        if (mraa_init() != MRAA_SUCCESS)
-            perror("Failed to initialize mraa\n");
+        printf("Failed to initialize mraa\n");
         return -1;
     }
 

examples/c/water.c

@@ -0,0 +1,70 @@
+/*
+ * 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 <signal.h>
+
+#include "water.h"
+#include "upm_utilities.h"
+
+int shouldRun = true;
+
+void sig_handler(int signo)
+{
+  if (signo == SIGINT)
+    shouldRun = false;
+}
+
+
+int main ()
+{
+    signal(SIGINT, sig_handler);
+
+//! [Interesting]
+    // Instantiate a Water sensor on digital pin D2
+    water_context sensor = water_init(2);
+
+    if (!sensor)
+    {
+        printf("dfrec_init() failed.\n");
+        return(1);
+    }
+
+    while (shouldRun)
+    {
+        if (water_is_wet(sensor))
+            printf("Sensor is wet\n");
+        else
+            printf("Sensor is dry\n");
+
+        upm_delay(1);
+    }
+//! [Interesting]
+
+    printf("Exiting...\n");
+
+    water_close(sensor);
+
+    return 0;
+}

include/fti/upm_binary.h

@@ -0,0 +1,43 @@
+/*
+ * Authors: 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.
+ */
+#ifndef UPM_BINARY_H_
+#define UPM_BINARY_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Binary function table.  This table is for simple sensors that just
+// return a single TRUE/FALSE, ON/OFF type values.  It can also be
+// used to set a simple binary value.
+typedef struct _upm_binary_ft {
+    upm_result_t (*upm_binary_get_value) (void* dev, bool* value);
+    upm_result_t (*upm_binary_set_value) (void* dev, bool value);
+} upm_binary_ft;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UPM_BINARY_H_ */

include/upm_fti.h

@@ -73,7 +73,8 @@ typedef enum {
     UPM_VOLTAGE,
     UPM_WIRELESS,
     UPM_STREAM,
-    UPM_ORP
+    UPM_ORP,
+    UPM_BINARY
 } upm_sensor_t;
 
 /* Supported IO protocols via MRAA */
@@ -120,6 +121,7 @@ typedef struct _upm_sensor_ft* (*func_get_upm_sensor_ft)(upm_sensor_t sensor_typ
 #include <fti/upm_orp.h>
 #include <fti/upm_ec.h>
 #include <fti/upm_humidity.h>
+#include <fti/upm_binary.h>
 
 #ifdef __cplusplus
 }

src/water/CMakeLists.txt

@@ -1,5 +1,9 @@
 upm_mixed_module_init (NAME water
     DESCRIPTION "UPM water sensor module"
+    C_HDR water.h
+    C_SRC water.c
     CPP_HDR water.hpp
     CPP_SRC water.cxx
+    FTI_SRC water_fti.c
+    CPP_WRAPS_C
     REQUIRES mraa)

src/water/water.c

@@ -0,0 +1,78 @@
+/*
+ * Author: 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
+ * "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 "water.h"
+
+water_context water_init(unsigned int pin)
+{
+  water_context dev =
+    (water_context)malloc(sizeof(struct _water_context));
+
+  if (!dev)
+    return NULL;
+
+  dev->gpio = NULL;
+
+  // make sure MRAA is initialized
+  int mraa_rv;
+  if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
+  {
+      printf("mraa_init() failed (%d).\n", mraa_rv);
+      mraa_result_print(mraa_rv);
+      water_close(dev);
+      return NULL;
+  }
+
+  // initialize the MRAA context
+
+  if (!(dev->gpio = mraa_gpio_init(pin)))
+    {
+      printf("%s: mraa_gpio_init() failed.\n", __FUNCTION__);
+      water_close(dev);
+      return NULL;
+    }
+
+  mraa_gpio_dir(dev->gpio, MRAA_GPIO_IN);
+
+  return dev;
+}
+
+void water_close(const water_context dev)
+{
+  assert(dev != NULL);
+
+  if (dev->gpio)
+    mraa_gpio_close(dev->gpio);
+
+  free(dev);
+}
+
+bool water_is_wet(const water_context dev)
+{
+  assert(dev != NULL);
+
+  // gpio is low when wet
+  return (mraa_gpio_read(dev->gpio) ? false : true);
+}

src/water/water.cxx

@@ -31,24 +31,20 @@
 using namespace upm;
 using namespace std;
 
-Water::Water(int pin)
+Water::Water(unsigned int pin) :
+  m_water(water_init(pin))
 {
-  if ( !(m_gpio = mraa_gpio_init(pin)) )
-    {
-      throw std::invalid_argument(std::string(__FUNCTION__) +
-                                  ": mraa_gpio_init() failed, invalid pin?");
-      return;
-    }
-
-  mraa_gpio_dir(m_gpio, MRAA_GPIO_IN);
+  if (!m_water )
+    throw std::runtime_error(std::string(__FUNCTION__) +
+                             ": water_init() failed");
 }
 
 Water::~Water()
 {
-  mraa_gpio_close(m_gpio);
+  water_close(m_water);
 }
 
 bool Water::isWet()
 {
-  return (!mraa_gpio_read(m_gpio) ? true : false);
+  return water_is_wet(m_water);
 }

src/water/water.h

@@ -0,0 +1,70 @@
+/*
+ * Author: 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
+ * "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 "upm.h"
+#include "mraa/gpio.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  /**
+   * @brief Water Sensor
+   *
+   * This module simply tests for the presence of water.
+   *
+   * @snippet water.c Interesting
+   */
+
+  /**
+   * Device context
+   */
+  typedef struct _water_context {
+    mraa_gpio_context        gpio;
+  } *water_context;
+
+  /**
+   * Water initializer
+   *
+   * @param pin Digital pin to use
+   * @return an initialized device context on success, NULL on error.
+   */
+  water_context water_init(unsigned int pin);
+
+  /**
+   * Water close function
+   */
+  void water_close(water_context dev);
+
+  /**
+   * Gets the water (wet/not wet) value from the sensor.
+   *
+   * @return true if the sensor is wet, false otherwise
+   */
+  bool water_is_wet(const water_context dev);
+
+#ifdef __cplusplus
+}
+#endif

src/water/water.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
@@ -24,7 +24,7 @@
 #pragma once
 
 #include <string>
-#include <mraa/gpio.h>
+#include "water.h"
 
 namespace upm {
   /**
@@ -56,7 +56,7 @@ namespace upm {
      *
      * @param pin Digital pin to use
      */
-    Water(int pin);
+    Water(unsigned int pin);
     /**
      * Water destructor
      */
@@ -69,6 +69,6 @@ namespace upm {
     bool isWet();
 
   private:
-    mraa_gpio_context m_gpio;
+    water_context m_water;
   };
 }

src/water/water_fti.c

@@ -0,0 +1,82 @@
+/*
+ * 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 "water.h"
+#include "upm_fti.h"
+
+/**
+ * This file implements the Function Table Interface (FTI) for this sensor
+ */
+
+const char upm_water_name[] = "water";
+const char upm_water_description[] = "Water presence sensor";
+const upm_protocol_t upm_water_protocol[] = {UPM_GPIO};
+const upm_sensor_t upm_water_category[] = {UPM_BINARY};
+
+// forward declarations
+const void* upm_water_get_ft(upm_sensor_t sensor_type);
+void* upm_water_init_name();
+void upm_water_close(void *dev);
+upm_result_t upm_water_is_wet(void *dev, bool *value);
+
+static const upm_sensor_ft ft =
+{
+  .upm_sensor_init_name = upm_water_init_name,
+  .upm_sensor_close = upm_water_close,
+};
+
+static const upm_binary_ft bft =
+{
+  .upm_binary_get_value = upm_water_is_wet,
+};
+
+const void* upm_water_get_ft(upm_sensor_t sensor_type)
+{
+  switch(sensor_type)
+    {
+    case UPM_SENSOR:
+      return &ft;
+    case UPM_BINARY:
+      return &bft;
+    default:
+      return NULL;
+    }
+}
+
+void *upm_water_init_name()
+{
+  return NULL;
+}
+
+void upm_water_close(void *dev)
+{
+  water_close((water_context)dev);
+}
+
+upm_result_t upm_water_is_wet(void *dev, bool *value)
+{
+  *value = water_is_wet((water_context)dev);
+
+  return UPM_SUCCESS;
+}