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

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

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;
+}