printrun-src/printrun/serialWrapper.py

Fri, 28 Jul 2017 15:57:22 +0200

author
mdd
date
Fri, 28 Jul 2017 15:57:22 +0200
changeset 29
c96f20e95029
parent 15
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permissions
-rw-r--r--

Changed min/max setting values

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1 # Serial wrapper around pyserial that adds support for custom baudrates (250000)
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2 # on linux, when pyserial is < 2.7
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3
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4 # This code was copied from the pyserial 2.7 base code.
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5 # Therefore, it follows the license used by pyserial which is the '3-clause BSD license'
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6
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7 from serial import *
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8 import sys
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9
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10 if sys.platform.startswith('linux'):
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11 import serial.serialposix
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12
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13 try:
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14 import pkg_resources
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16 old_version = float(pkg_resources.get_distribution("pyserial").version) < 2.7
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17 except:
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18 old_version = True
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19
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20 if old_version and not hasattr(serial.serialposix, "TCGETS2") and \
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21 hasattr(serial.serialposix, "set_special_baudrate"):
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22 # Detected pyserial < 2.7 which doesn't support custom baudrates
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23 # Replacing set_special_baudrate with updated function from pyserial 2.7
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24
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25 TCGETS2 = 0x802C542A
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26 TCSETS2 = 0x402C542B
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27 BOTHER = 0o010000
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28
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29 def set_special_baudrate(port, baudrate):
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30 # right size is 44 on x86_64, allow for some growth
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31 import array
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32 buf = array.array('i', [0] * 64)
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33
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34 try:
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35 # get serial_struct
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36 FCNTL.ioctl(port.fd, TCGETS2, buf)
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37 # set custom speed
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38 buf[2] &= ~TERMIOS.CBAUD
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39 buf[2] |= BOTHER
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40 buf[9] = buf[10] = baudrate
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41
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42 # set serial_struct
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43 res = FCNTL.ioctl(port.fd, TCSETS2, buf)
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44 except IOError, e:
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45 raise ValueError('Failed to set custom baud rate (%s): %s' % (baudrate, e))
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46
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47 # We need to change the function inside the serialposix module otherwise, it won't
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48 # be called by the code within that module
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49 serial.serialposix.set_special_baudrate = set_special_baudrate

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