isd1820: Initial implementation

This driver implements support for the Grove Recorder.  It records up
to about 10 seconds of audio, and can play it back on command.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: John Van Drasek <john.r.van.drasek@intel.com>

src/isd1820/isd1820.cxx

@@ -0,0 +1,87 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015 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 <iostream>
+
+#include "isd1820.h"
+
+using namespace upm;
+using namespace std;
+
+ISD1820::ISD1820(int playPin, int recPin)
+{
+  if ( !(m_gpioPlay = mraa_gpio_init(playPin)) )
+    {
+      cerr << __FUNCTION__ << ": mraa_gpio_init() failed" << endl;
+      return;
+    }
+
+  mraa_gpio_dir(m_gpioPlay, MRAA_GPIO_OUT);
+
+  if ( !(m_gpioRec = mraa_gpio_init(recPin)) )
+    {
+      cerr << __FUNCTION__ << ": mraa_gpio_init() failed" << endl;
+      return;
+    }
+
+  mraa_gpio_dir(m_gpioRec, MRAA_GPIO_OUT);
+
+  // make sure we are not recording or playing
+  play(false);
+  record(false);
+}
+
+ISD1820::~ISD1820()
+{
+  mraa_gpio_close(m_gpioPlay);
+  mraa_gpio_close(m_gpioRec);
+}
+
+void ISD1820::play(bool enable)
+{
+  if (enable)
+    {
+      // make sure we are not recording
+      record(false);
+      mraa_gpio_write(m_gpioPlay, 1);
+    }
+  else
+    {
+      mraa_gpio_write(m_gpioPlay, 0);
+    }
+}
+
+void ISD1820::record(bool enable)
+{
+  if (enable)
+    {
+      // make sure we are not playing
+      play(false);
+      mraa_gpio_write(m_gpioRec, 1);
+    }
+  else
+    {
+      mraa_gpio_write(m_gpioRec, 0);
+    }
+}