Protocol decoder:graycode
Revision as of 17:19, 1 January 2018 by Uwe Hermann (talk | contribs)
Name | Gray code and rotary encoder |
---|---|
Description | Accumulate rotary encoder increments, provide timing statistics. |
Status | supported |
License | GPLv2+ |
Source code | decoders/graycode |
Input | logic |
Output | graycode |
Probes | — |
Optional probes | D0-D7 |
Options | numchannels, edges, avg_period |
The graycode protocol decoder can decode Gray Codes up to 8 data lines (but easily generalizes). One popular special case is the Rotary Encoder, which has two lines, A and B. The decoder will report phase, counting direction, absolute count, as well as timing information.
Parameters
edges: Number of rising and falling edges per turn of all lines. Rotary encoders are usually labeled as having N pulses per turn. A pulse consists of rising and falling edge and you have two lines that are phase-shifted by 90° to one another. This allows to extract 4N edges per turn.
numchannels: due to a current bug in Pulseview, assigned optional probes aren't reported correctly, so you'll have to select the number of channels manually.