annotate scpi.py @ 48:386e1cb04799

Fix comment
author Daniel O'Connor <darius@dons.net.au>
date Thu, 31 Jan 2013 11:32:06 +1030
parents e2833d081413
children 00800345fbae
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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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27
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28 import exceptions
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29 import numpy
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30 import re
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31
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32 headerre = re.compile('^(:[A-Z:]+ ).*')
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33 insturlre = re.compile('([a-zA-Z0-9]+)://(([^:]+)?(:([^/]+)@))?([^:]+)(:(.+))?')
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34
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35 def query(d, q, timeout = None):
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36 d.write(q)
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37 return d.read(timeout)
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38
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39 def clean(data):
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40 # The instrument might return some header before the data (TEK 2024B does this)
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41 m = headerre.match(data)
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42 if m == None:
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43 return data
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44 else:
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45 hlen = len(m.groups()[0])
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46 return(data[hlen:])
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47
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48 def getdata(data, dtype = float):
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49 '''Get a single data item'''
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50 data = clean(data)
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51 return dtype(data)
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52
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53 def bindecode(data, dtype = numpy.float32):
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54 '''Decode binary data, returns numpy array'''
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55
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56 data = clean(data)
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57
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58 if data[0] != '#':
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59 raise exceptions.ValueError('data length header incorrect')
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60 dlenlen = int(data[1])
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61 if dlenlen == 0:
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62 return numpy.array([])
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63
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64 dlen = int(data[2:dlenlen + 2])
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65 if dlen == 0:
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66 return numpy.array([])
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67
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68 wanted = dlen + 2 + dlenlen
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69 # Chop off the trailing \n if necessary
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70 if len(data) == wanted + 1 and data[-1] == '\n':
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71 data = data[0:-1]
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72
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73 if len(data) != wanted:
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74 raise exceptions.ValueError('length mismatch, header says %d, actually got %d bytes' % (wanted, len(data)))
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75 return numpy.frombuffer(data[2 + dlenlen:], dtype = dtype)
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76
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77 def ascdecode(data, dtype = numpy.float32, sep = None):
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78 '''Decode ASCII data, returns numpy array'''
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79
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80 data = clean(data)
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81
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82 # Strip length off if present as we don't need it
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83 if data[0] == '#':
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84 l = int(data[1])
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85 data = data[l + 2:]
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86
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87 # Take a guess at the separator
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88 if sep == None:
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89 if data.find(',', 0, 20) != -1:
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90 sep = ','
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91 else:
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92 sep = ' '
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93 return numpy.fromstring(data, dtype = dtype, sep = sep)
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94
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95
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96 def instURL(url):
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97 m = insturlre.match(url)
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98 if m == None:
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99 raise exceptions.ValueError('Unable to parse URL')
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100 proto, xxx, user, xxx, pwd, address, xxx, port = m.groups()
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101 if proto == 'rsib':
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102 import rsib
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103 return rsib.RSIBDevice(address, port)
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104 elif proto == 'usb':
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105 import usb488
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106 return usb488.USB488Device()
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107 elif proto == 'vxi':
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108 import vxi
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109 if port == None:
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110 port = 'inst0'
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111 return vxi.VXIDevice(address, device = port)
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112 elif proto == 'scpi':
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113 import scpisock
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114 return scpisock.SCPISockDevice(address, port)
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115 else:
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116 raise exceptions.NotImplementedError("unknown protocol " + proto)
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117
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118