1#!/usr/bin/env python
2
3# Author: Alex Tereschenko <alext.mkrs@gmail.com>
4# Copyright (c) 2015 Alex Tereschenko
5#
6# Permission is hereby granted, free of charge, to any person obtaining
7# a copy of this software and associated documentation files (the
8# "Software"), to deal in the Software without restriction, including
9# without limitation the rights to use, copy, modify, merge, publish,
10# distribute, sublicense, and/or sell copies of the Software, and to
11# permit persons to whom the Software is furnished to do so, subject to
12# the following conditions:
13#
14# The above copyright notice and this permission notice shall be
15# included in all copies or substantial portions of the Software.
16#
17# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
24
25import mraa
26
27# Initialize UART
28u=mraa.Uart(0)
29
30# Set UART parameters
31u.setBaudRate(115200)
32u.setMode(8, mraa.UART_PARITY_NONE, 1)
33u.setFlowcontrol(False, False)
34
35# Start a neverending loop waiting for data to arrive.
36# Press Ctrl+C to get out of it.
37while True:
38  if u.dataAvailable():
39    # We are doing 1-byte reads here
40    data_byte = u.readStr(1)
41    print(data_byte)
42    # Just a two-way half-duplex communication example, "X" is a flag
43    if data_byte == "X":
44      u.writeStr("Yes, master!")
45