rhusb: Initial implementation

The driver implements support for the Omega RH-USB Humidity Probe with
Temperature sensor.  It connects via an integrated USB cable, and
appears as a serial port.

It does not currently work with Edison (as of this date) due to
missing ftdi_sio and usbserial kernel support.

It was implemented and tested on the Galileo 2.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/c++/CMakeLists.txt

@@ -238,6 +238,7 @@ if (MODBUS_FOUND)
   add_example (hwxpxx)
 endif()
 add_example (hdxxvxta)
+add_example (rhusb)
 
 # These are special cases where you specify example binary, source file and module(s)
 include_directories (${PROJECT_SOURCE_DIR}/src)

examples/c++/rhusb.cxx

@@ -0,0 +1,88 @@
+/*
+ * 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 <iostream>
+#include <signal.h>
+
+#include "rhusb.h"
+
+using namespace std;
+
+bool shouldRun = true;
+
+void sig_handler(int signo)
+{
+  if (signo == SIGINT)
+    shouldRun = false;
+}
+
+int main(int argc, char **argv)
+{
+  signal(SIGINT, sig_handler);
+
+//! [Interesting]
+
+  string defaultDev = "/dev/ttyUSB0";
+
+  // if an argument was specified, use it as the device instead
+  if (argc > 1)
+    defaultDev = string(argv[1]);
+
+  cout << "Using device " << defaultDev << endl;
+  cout << "Initializing..." << endl;
+
+  // Instantiate an RHUSB instance on defaultDev
+  upm::RHUSB sensor(defaultDev);
+
+  // output the firmware ID
+  cout << "Firmware ID: " << sensor.getFirmwareID() << endl;
+  cout << endl;
+
+  // update and print available values every second
+  while (shouldRun)
+    {
+      // update our values from the sensor
+      sensor.update();
+
+      // we show both C and F for temperature
+      cout << "Temperature: " << sensor.getTemperature()
+           << " C / " << sensor.getTemperature(true) << " F"
+           << endl;
+
+      cout << "Humidity: " << sensor.getHumidity()
+           << " %" << endl;
+
+      cout << endl;
+
+      sleep(1);
+    }
+
+
+  cout << "Exiting..." << endl;
+
+//! [Interesting]
+
+  return 0;
+}