#!/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 import sys sys.stdout.write("Initializing UART...") u=mraa.Uart(0) print("...done") 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) 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() msg_s = "Hello, mraa string!" print("Sending message as a string: '{0}'".format(msg_s)) u.writeStr(msg_s) 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?")