nmea_gps: renamed vk2828u7 to nmea_gps

This driver will serve as a generic module for grabbing NMEA data from
various GPS devices via a serial interface.  ublox6 will also be
removed in favor of using this driver going forward.

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

examples/c/nmea_gps.c

@@ -0,0 +1,80 @@
+/*
+ * 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 "nmea_gps.h"
+
+bool shouldRun = true;
+
+const size_t bufferLength = 256;
+
+void sig_handler(int signo)
+{
+  if (signo == SIGINT)
+    shouldRun = false;
+}
+
+int main()
+{
+  signal(SIGINT, sig_handler);
+
+//! [Interesting]
+
+  // Instantiate a NMEA_GPS sensor on uart 0 at 9600 baud with enable
+  // pin on D3.  If you do not need an enable pin, you can specify -1.
+  nmea_gps_context sensor = nmea_gps_init(0, 9600, 3);
+
+  if (!sensor)
+    {
+      printf("nmea_gps_init() failed.\n");
+      return 1;
+    }
+
+  char buffer[bufferLength];
+  int rv = 0;
+
+  // loop, dumping NMEA data out as fast as it comes in
+  while (shouldRun && nmea_gps_data_available(sensor, 5000))
+    {
+      if ((rv = nmea_gps_read(sensor, buffer, bufferLength)) >= 0)
+        {
+          int i;
+          for (i=0; i<rv; i++)
+            printf("%c", buffer[i]);
+        }
+    }
+
+  if (shouldRun)
+    printf("Timed out\n");
+
+//! [Interesting]
+
+  printf("Exiting\n");
+
+  nmea_gps_close(sensor);
+
+  return 0;
+}