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
26import sys
27
28sys.stdout.write("Initializing UART...")
29u=mraa.Uart(0)
30print("...done")
31
32print("Setting UART parameters: baudrate 115200, 8N1, no flow control")
33u.setBaudRate(115200)
34u.setMode(8, mraa.UART_PARITY_NONE, 1)
35u.setFlowcontrol(False, False)
36
37msg_b = bytearray("Hello, mraa byte array!", "ascii")
38print("Sending message as a byte array: '{0}'".format(msg_b))
39u.write(msg_b)
40# Make sure the message gets out to the line.
41# It's generally unnecessary (and performance-degrading) to do this explicitly,
42# UART driver normally takes care of that, but it may be useful with specific
43# half-duplex endpoints, like Dynamixel servos.
44u.flush()
45
46msg_s = "Hello, mraa string!"
47print("Sending message as a string: '{0}'".format(msg_s))
48u.writeStr(msg_s)
49
50sys.stdout.write("Two-way, half-duplex communication, sending a flag...")
51u.writeStr("X")
52print("...sent, awaiting response...")
53# Checking for data in the RX buffer, giving it a 100ms timeout
54if u.dataAvailable(100):
55  print("We've got a response: '{0}', says the other side".format(u.readStr(20)))
56else:
57  print("No data received, do you have anything at the other end?")
58