examples: added more elaborated Python UART example

Closes #376.

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/python/uart_receiver.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2015 Alex Tereschenko
+#
+# 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
+
+import mraa
+
+# Initialize UART
+u=mraa.Uart(0)
+
+# Set UART parameters
+u.setBaudRate(115200)
+u.setMode(8, mraa.UART_PARITY_NONE, 1)
+u.setFlowcontrol(False, False)
+
+# Start a neverending loop waiting for data to arrive.
+# Press Ctrl+C to get out of it.
+while True:
+  if u.dataAvailable():
+    # We are doing 1-byte reads here
+    data_byte = u.readStr(1)
+    print(data_byte)
+    # Just a two-way half-duplex communication example, "X" is a flag
+    if data_byte == "X":
+      u.writeStr("Yes, master!")