bmpx8x: rewrite in C; FTI; C++ wraps C

This driver has been rewritten from scratch.

See docs/apichanges.md for a list of API compatibility changes
compared to the original driver.

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

examples/c/CMakeLists.txt

@@ -157,6 +157,7 @@ add_example (bmg160)
 add_example (bma250e)
 add_example (bmm150)
 add_example (rsc)
+add_example (bmpx8x)
 
 # Custom examples
 add_custom_example (nmea_gps_i2c-example-c nmea_gps_i2c.c nmea_gps)

examples/c/bmpx8x.c

@@ -0,0 +1,88 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2017 Intel Corporation.
+ *
+ * The MIT License
+ *
+ * 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 "bmpx8x.h"
+
+bool shouldRun = true;
+
+void sig_handler(int signo)
+{
+    if (signo == SIGINT)
+        shouldRun = false;
+}
+
+
+int main(int argc, char **argv)
+{
+    signal(SIGINT, sig_handler);
+//! [Interesting]
+
+    // Instantiate a BMPX8X instance using default i2c bus and address
+    bmpx8x_context sensor = bmpx8x_init(BMPX8X_DEFAULT_I2C_BUS,
+                                        BMPX8X_DEFAULT_I2C_ADDR);
+
+    if (!sensor)
+    {
+        printf("bmpx8x_init() failed.\n");
+        return 1;
+    }
+
+    // Print the pressure, altitude, sea level, and
+    // temperature values every 0.5 seconds
+    while (shouldRun)
+    {
+        if (bmpx8x_update(sensor))
+        {
+            printf("bmpx8x_update() failed\n");
+            bmpx8x_close(sensor);
+            return 1;
+        }
+
+        // assume sea level pressure is 101325 Pa.
+        float altitude = bmpx8x_get_altitude(sensor, 101325);
+        int   sealevel = bmpx8x_get_sealevel_pressure(sensor, altitude);
+
+        printf("Pressure: %d Pa, Temperature: %f C, "
+               "Altitude %f m, Sea level %d Pa\n",
+               bmpx8x_get_pressure(sensor),
+               bmpx8x_get_temperature(sensor),
+               altitude,
+               sealevel);
+
+        upm_delay_ms(500);
+    }
+
+    printf("Exiting...\n");
+    bmpx8x_close(sensor);
+
+//! [Interesting]
+    return 0;
+}