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annotate vxi.py @ 72:da3558dec4e3

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Fetch large data blocks correctly. Add ask function.
author Daniel O'Connor <doconnor@gsoft.com.au>
date Wed, 25 Sep 2024 20:56:39 +0930
parents 12b6a3a0a481
children
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6fe43d62c73b Add a wrapper around vxi_11_connection so it acts like the other classes.
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2011
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4 # Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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5 #
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6 # Redistribution and use in source and binary forms, with or without
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7 # modification, are permitted provided that the following conditions
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8 # are met:
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9 # 1. Redistributions of source code must retain the above copyright
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10 # notice, this list of conditions and the following disclaimer.
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11 # 2. Redistributions in binary form must reproduce the above copyright
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12 # notice, this list of conditions and the following disclaimer in the
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13 # documentation and/or other materials provided with the distribution.
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14 #
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15 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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25 # SUCH DAMAGE.
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26 #
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28 # A wrapper to make vxi_11 behave more like we expect
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29
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30 import exceptions
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31 import vxi_11
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32
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33 class VXIDevice(object):
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34 def __init__(self, host, device):
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35 self.v = vxi_11.vxi_11_connection(host, device = device, timeout = 1500)
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37 def flush(self, timeout = None):
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38 pass
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40 def write(self, data):
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41 err, base = self.v.write(data)
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42 if err != 0:
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43 raise exceptions.IOError("Error writing " + str(err))
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45 def read(self, timeout = None):
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46 if timeout != None:
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47 timeout = int(timeout * 1000.0) # Convert to msec
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49 err, reason, result = self.v.read(timeout)
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50 if err != 0:
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51 raise exceptions.IOError("Error reading %d, reason %d" % (err, reason))
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52 return result