Mercurial > pygpibtoolkit / file comparison
comparison: read_trace.py
read_trace.py
- changeset 6
- 6b6dc68588b2
- parent 0
- 9af1509775b6
- child 10
- 2999318b49a2
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| 5:4d86b11abb82 | 6:6b6dc68588b2 |
|---|---|
| 14 m = [ord(x) for x in s[:-1]] | 14 m = [ord(x) for x in s[:-1]] |
| 15 M = 0. | 15 M = 0. |
| 16 for i in range(len(s)-1): | 16 for i in range(len(s)-1): |
| 17 #M += m[i]<<(i*8) | 17 #M += m[i]<<(i*8) |
| 18 M += float(m[i])/2**((i+1)*8) | 18 M += float(m[i])/2**((i+1)*8) |
| 19 | 19 # XXX how do we deal negative numbers? |
| 20 #if m[0] & 0x80: | 20 #if m[0] & 0x80: |
| 21 # M = M - 2^(len(s)) | 21 # M = M - 2^(len(s)) |
| 22 | |
| 23 return M * 2**(e+1) | 22 return M * 2**(e+1) |
| 24 mm = str(M) | |
| 25 | |
| 26 mm = '0.'+mm + 'e' + str(e) | |
| 27 if len(s) == 8: | |
| 28 print "mm = ", mm | |
| 29 return eval(mm) | |
| 30 | 23 |
| 31 def decode_string(s): | 24 def decode_string(s): |
| 32 nb = ord(s[0]) | 25 nb = ord(s[0]) |
| 33 s = s[1:nb+2] | 26 s = s[1:nb+2] |
| 34 r = "" | 27 r = "" |
| 28 # XXX why do we need to do this? It's not described in the manual... | |
| 35 for c in s: | 29 for c in s: |
| 36 if ord(c)>128: | 30 r += chr(ord(c) & 0x7F) |
| 37 c = chr(ord(c)-128) | |
| 38 r += c | |
| 39 return r | 31 return r |
| 40 | 32 |
| 41 EDSP = {0: "No data", | 33 EDSP = {0: "No data", |
| 42 1: "Frequency response", | 34 1: "Frequency response", |
| 43 2: "Power spectrum 1", | 35 2: "Power spectrum 1", |
| 143 22: "Minutes", | 135 22: "Minutes", |
| 144 23: "V²s/Hz", | 136 23: "V²s/Hz", |
| 145 24: "Octave", | 137 24: "Octave", |
| 146 25: "Seconds/Decade", | 138 25: "Seconds/Decade", |
| 147 26: "Seconds/Octave", | 139 26: "Seconds/Octave", |
| 148 #... | 140 27: "Hz/Point", |
| 141 28: "Points/Sweep", | |
| 142 29: "Points/Decade", | |
| 143 30: "Points/Octave", | |
| 144 31: "V/Vrms", | |
| 145 32: "V²", | |
| 146 33: "EU referenced to chan 1", | |
| 147 34: "EU referenced to chan 2", | |
| 148 35: "EU value", | |
| 149 } | 149 } |
| 150 | 150 |
| 151 EMEAS = {0: "Linear resolution", | 151 EMEAS = {0: "Linear resolution", |
| 152 1: "Log resolution", | 152 1: "Log resolution", |
| 153 2: "Swept sine", | 153 2: "Swept sine", |
| 169 | 169 |
| 170 | 170 |
| 171 EWIN = {0: "N/A", | 171 EWIN = {0: "N/A", |
| 172 1: "Hann", | 172 1: "Hann", |
| 173 2: "Flat top", | 173 2: "Flat top", |
| 174 #... | 174 3: "Uniforme", |
| 175 4: "Exponential", | |
| 176 5: "Force", | |
| 177 6: "Force chan 1/expon chan 2", | |
| 178 7: "Expon chan 1/force chan 2", | |
| 179 8: "User", | |
| 175 } | 180 } |
| 176 | 181 |
| 177 HEADER = [ ("Display function", EDSP, 'h', 2), | 182 HEADER = [ ("Display function", EDSP, 'h', 2), |
| 178 ('Number of elements', int, 'h', 2), | 183 ('Number of elements', int, 'h', 2), |
| 179 ('Displayed elements', int, 'h', 2), | 184 ('Displayed elements', int, 'h', 2), |
