Mercurial > pygpibtoolkit / file comparison
comparison: HP3562A/trace_decoder.py
HP3562A/trace_decoder.py
- changeset 16
- de9122b5680a
- parent 14
- 07e2cbf140df
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| 15:b930440af354 | 16:de9122b5680a |
|---|---|
| 8 | 8 |
| 9 This file can be exectued as a python script. Use '-h' for more informations. | 9 This file can be exectued as a python script. Use '-h' for more informations. |
| 10 """ | 10 """ |
| 11 import struct | 11 import struct |
| 12 import numpy | 12 import numpy |
| 13 from HP3562A import format_header, decode_float, decode_string, decode_header | 13 from HP3562A import format_header, decode_float, decode_string, decode_header, read_trace |
| 14 from HP3562A.enum_types import * | 14 from HP3562A.enum_types import * |
| 15 | 15 |
| 16 | 16 |
| 17 HEADER = [ ("Display function", EDSP, 'h', 2), | 17 HEADER = [ ("Display function", EDSP, 'h', 2), |
| 18 ('Number of elements', int, 'h', 2), | 18 ('Number of elements', int, 'h', 2), |
| 59 ('Trig delay chan 2', decode_float, None, 4), | 59 ('Trig delay chan 2', decode_float, None, 4), |
| 60 ('Start freq value', decode_float, None, 8), | 60 ('Start freq value', decode_float, None, 8), |
| 61 ('Start data value', decode_float, None, 8), | 61 ('Start data value', decode_float, None, 8), |
| 62 ] | 62 ] |
| 63 | 63 |
| 64 def decode_trace(data): | 64 def decode_trace(data, idx=0): |
| 65 """ | 65 """ |
| 66 Decode the data (as generated by the HP3562A DSA in response to a | 66 Decode the data (as generated by the HP3562A DSA in response to a |
| 67 "DDBN" command), and returns a couple (header, values). | 67 "DDBN" command), and returns a couple (header, values). |
| 68 | 68 |
| 69 header is the dictionnary of the header of the dumped data block, | 69 header is the dictionnary of the header of the dumped data block, |
| 70 value is a numpy array holding the trace (vector of float or | 70 value is a numpy array holding the trace (vector of float or |
| 71 complex values). | 71 complex values). |
| 72 """ | 72 """ |
| 73 header, idx = decode_header(data, HEADER) | 73 header, idx = decode_header(data, HEADER, idx) |
| 74 resu = [] | 74 return header, read_trace(data, idx, header["Number of elements"]) |
| 75 for i in range(header["Number of elements"]): | |
| 76 resu.append(decode_float(data[idx: idx+4])) | |
| 77 idx += 4 | |
| 78 return header, numpy.array(resu, dtype=float) | |
| 79 | |
| 80 | |
| 81 | 75 |
| 82 def main(): | 76 def main(): |
| 83 import sys | 77 import sys |
| 84 import optparse | 78 import optparse |
| 85 opt = optparse.OptionParser("A simple tool for tracing a dumped trace") | 79 opt = optparse.OptionParser("A simple tool for tracing a dumped trace") |
