t3311: Initial implementation

This module implements support for the Comet System T3311 Temperature
and Humidity transmitter.  It uses MODBUS over an RS232 serial port.

You must have libmodbus v3.1.2 (or greater) installed to compile and
use this driver.

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

examples/c++/CMakeLists.txt

@@ -232,6 +232,10 @@ if (OPENZWAVE_FOUND)
 endif()
 add_example (nlgpio16)
 add_example (ads1x15)
+if (MODBUS_FOUND)
+  include_directories(${MODBUS_INCLUDE_DIRS})
+  add_example (t3311)
+endif()
 
 # These are special cases where you specify example binary, source file and module(s)
 include_directories (${PROJECT_SOURCE_DIR}/src)

examples/c++/t3311.cxx

@@ -0,0 +1,115 @@
+/*
+ * 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 "t3311.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 << "Initializing..." << endl;
+
+  // Instantiate an T3311 instance, using MODBUS slave address 1, and
+  // default comm parameters (9600, 8, N, 2)
+  upm::T3311 *sensor = new upm::T3311(defaultDev, 1);
+
+  // output the serial number and firmware revision
+  cout << "Serial Number: " << sensor->getSerialNumber() << endl;
+  cout << "Firmware Revision: " << sensor->getFirmwareMajor()
+       << "." << sensor->getFirmwareMinor() << 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;
+
+      // this value depends on the sensor configuration -- by default
+      // it is the dew point temperature
+      cout << "Computed Value: " << sensor->getComputedValue() << endl;
+
+      // with FW revisions > 2.44, extended computed data is available
+      if (sensor->extendedDataAvailable())
+        {
+          cout << "Dew Point Temperature: " << sensor->getDewPointTemperature()
+               << " C / " << sensor->getDewPointTemperature(true) << " F"
+               << endl;
+
+          cout << "Absolute Humidity: " << sensor->getAbsoluteHumidity()
+               << " g/m3" << endl;
+
+          cout << "Specific Humidity: " << sensor->getSpecificHumidity()
+               << " g/kg" << endl;
+
+          cout << "Mixing Ratio: " << sensor->getMixingRatio()
+               << " g/kg" << endl;
+
+          cout << "Specific Enthalpy: " << sensor->getSpecificEnthalpy()
+               << " kJ/kg" << endl;
+        }
+
+      cout << endl;
+
+      sleep(1);
+    }
+
+  cout << "Exiting..." << endl;
+
+  delete sensor;
+
+//! [Interesting]
+
+  return 0;
+}