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Commit | Line | Data |
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1 | == Data Analysis | |
2 | ||
3 | Once you have acquired some measurement data, it's time to have a look and see what | |
4 | insights you can gain from it. Usually, the first step is to look at the data as a | |
5 | whole, achieved by clicking the _Zoom to Fit_ button: | |
6 | ||
7 | image::pv_analysis.png[] | |
8 | ||
9 | <1> Zoom-to-Fit button | |
10 | <2> Zoom in/zoom out buttons | |
11 | <3> Cursors | |
12 | <4> Time scale (used to set up and show markers, see below) | |
13 | ||
14 | If you have located an area of interest (maybe with the help of decoders, more about | |
15 | that later), you can zoom in on it using the _zoom in_/_zoom out_ buttons, using the | |
16 | scroll wheel of your mouse or the pinch/expand gestures on your touch panel. | |
17 | ||
18 | [NOTE] | |
19 | When a data capture is ongoing, the Zoom-to-Fit button stays active if you click it, | |
20 | meaning that PulseView automatically fits all data to the views until either the | |
21 | capture is finished or the Zoom-to-Fit button is clicked again. | |
22 | If you want this feature but don't want to always have to click the button, you | |
23 | can enable the "Always Zoom-to-Fit" option in the settings. | |
24 | ||
25 | === Cursors and Markers | |
26 | ||
27 | Just looking at the signal data however is usually not sufficient. A lot of times, | |
28 | you'll want to make sure that timings are honored and the bit times are like what | |
29 | you'd expect. To do so, you'll want to use cursors and markers. | |
30 | ||
31 | In the picture above, you can enable the cursor by clicking on the cursor button. | |
32 | You can move both of its boundaries around by clicking on the blue flags in the | |
33 | time scale area. The area between the two boundary lines shows the time distance | |
34 | and its inverse (i.e. the frequency). If you can't see it, just zoom in until it | |
35 | shows. You can also move both boundaries at the same time by dragging the label | |
36 | where this information is shown. | |
37 | ||
38 | image::pv_cursors_markers.png[] | |
39 | ||
40 | <1> Cursors button, showing enabled state | |
41 | <2> Cursor | |
42 | <3> Marker | |
43 | ||
44 | Markers are movable indicators that you can create wherever you like on the | |
45 | time scale - just double-click on it and it'll create one for you where your | |
46 | mouse cursor is at the time, or use the context menu when right-clicking on | |
47 | the ruler or a signal trace. | |
48 | You can click on its label and you'll have the option to change its name, or | |
49 | drag it to reposition it. | |
50 | ||
51 | [NOTE] | |
52 | For timing comparison purposes, you can also enable a vertical marker line that | |
53 | follows your mouse cursor: _Settings_ -> _Views_ -> _Highlight mouse cursor_ | |
54 | ||
55 | [NOTE] | |
56 | There is also a special kind of marker that appears for each time the data | |
57 | acquisition device has triggered. It cannot be moved and appears as a vertical | |
58 | dashed line. | |
59 | ||
60 | === Special-Purpose Decoders | |
61 | ||
62 | There are some decoders available that analyze the data instead of decoding it. | |
63 | You can make use of them to examine various properties of the signals that are | |
64 | of interest to you. | |
65 | ||
66 | Their names are: | |
67 | ||
68 | * Counter - counts pulses and/or groups of pulses (i.e. words) | |
69 | * Guess bitrate - guesses the bitrate when using a serial protocol | |
70 | * Jitter - determines the jitter (variance) of a signal | |
71 | * Timing - shows the time passing between the chosen signal edges | |
72 | ||
73 | === Other Features | |
74 | ||
75 | Trace Views also allow you to maximize the viewing area by minimizing the area | |
76 | occupied by the label area on the left. To do this, simply position the mouse | |
77 | cursor at the right edge of the label area (or left edge of the viewing area). | |
78 | Your mouse cursor will change shape and you now can drag the border. | |
79 | ||
80 | This way, you can give signals long, expressive names without clogging up the | |
81 | view area. | |
82 | ||
83 | Also, you can create multiple views by clicking on the "New View" button on | |
84 | the very left of the toolbar. Those can be rearranged as you wish. |