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annotate scpi.py @ 26:226ea06bc050

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Use "new" style exceptions.
author Daniel O'Connor <darius@dons.net.au>
date Wed, 21 Sep 2011 14:54:34 +0930
parents a124aa7067e7
children e2833d081413
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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
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34 def clean(data):
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35 # The instrument might return some header before the data (TEK 2024B does this)
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36 m = headerre.match(data)
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37 if m == None:
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38 return data
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39 else:
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40 hlen = len(m.groups()[0])
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41 return(data[hlen:])
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42
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43 def getdata(data, dtype = float):
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44 '''Get a single data item'''
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45 data = clean(data)
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46 return dtype(data)
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47
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48 def bindecode(data, dtype = numpy.float32):
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49 '''Decode binary data, returns numpy array'''
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50
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51 data = clean(data)
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52
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53 if data[0] != '#':
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54 raise exceptions.ValueError('data length header incorrect')
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55 dlenlen = int(data[1])
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56 dlen = int(data[2:dlenlen + 2])
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57 if len(data) != dlen + 2 + dlenlen:
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58 raise exceptions.ValueError('length mismatch, header says %d, actually got %d bytes' % (dlen + 2 + dlenlen, len(data)))
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59 return numpy.frombuffer(data[2 + dlenlen:], dtype = dtype)
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60
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61 def ascdecode(data, dtype = numpy.float32, sep = None):
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62 '''Decode ASCII data, returns numpy array'''
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63
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64 data = clean(data)
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66 # Strip length off if present as we don't need it
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67 if data[0] == '#':
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68 l = int(data[1])
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69 data = data[l + 2:]
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70
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71 # Take a guess at the separator
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72 if sep == None:
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73 if data.find(',', 0, 20) != -1:
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74 sep = ','
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75 else:
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76 sep = ' '
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77 return numpy.fromstring(data, dtype = dtype, sep = sep)
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78