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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>
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#!/usr/bin/env python | ||
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# 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 | ||
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import mraa | ||
import sys | ||
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sys.stdout.write("Initializing UART...") | ||
u=mraa.Uart(0) | ||
print("...done") | ||
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print("Setting UART parameters: baudrate 115200, 8N1, no flow control") | ||
u.setBaudRate(115200) | ||
u.setMode(8, mraa.UART_PARITY_NONE, 1) | ||
u.setFlowcontrol(False, False) | ||
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msg_b = bytearray("Hello, mraa byte array!", "ascii") | ||
print("Sending message as a byte array: '{0}'".format(msg_b)) | ||
u.write(msg_b) | ||
# Make sure the message gets out to the line. | ||
# It's generally unnecessary (and performance-degrading) to do this explicitly, | ||
# UART driver normally takes care of that, but it may be useful with specific | ||
# half-duplex endpoints, like Dynamixel servos. | ||
u.flush() | ||
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msg_s = "Hello, mraa string!" | ||
print("Sending message as a string: '{0}'".format(msg_s)) | ||
u.writeStr(msg_s) | ||
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sys.stdout.write("Two-way, half-duplex communication, sending a flag...") | ||
u.writeStr("X") | ||
print("...sent, awaiting response...") | ||
# Checking for data in the RX buffer, giving it a 100ms timeout | ||
if u.dataAvailable(100): | ||
print("We've got a response: '{0}', says the other side".format(u.readStr(20))) | ||
else: | ||
print("No data received, do you have anything at the other end?") |