Home | History | Annotate | Download | only in python 
      1 #!/usr/bin/env python
      2 
      3 # Author: Alex Tereschenko <alext.mkrs (at] 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 
     25 import mraa
     26 import sys
     27 
     28 sys.stdout.write("Initializing UART...")
     29 u=mraa.Uart(0)
     30 print("...done")
     31 
     32 print("Setting UART parameters: baudrate 115200, 8N1, no flow control")
     33 u.setBaudRate(115200)
     34 u.setMode(8, mraa.UART_PARITY_NONE, 1)
     35 u.setFlowcontrol(False, False)
     36 
     37 msg_b = bytearray("Hello, mraa byte array!", "ascii")
     38 print("Sending message as a byte array: '{0}'".format(msg_b))
     39 u.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.
     44 u.flush()
     45 
     46 msg_s = "Hello, mraa string!"
     47 print("Sending message as a string: '{0}'".format(msg_s))
     48 u.writeStr(msg_s)
     49 
     50 sys.stdout.write("Two-way, half-duplex communication, sending a flag...")
     51 u.writeStr("X")
     52 print("...sent, awaiting response...")
     53 # Checking for data in the RX buffer, giving it a 100ms timeout
     54 if u.dataAvailable(100):
     55   print("We've got a response: '{0}', says the other side".format(u.readStr(20)))
     56 else:
     57   print("No data received, do you have anything at the other end?")
     58