Difference between revisions of "Protocol decoder:Graycode"

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{{Infobox protocol decoder
{{Infobox protocol decoder
| id              = graycode
| id              = graycode
| name            = graycode
| name            = Gray Code
| description    = Gray Code and Rotary Encoder
| description    = Gray Code and Rotary Encoder
| status          = ??
| status          = ??

Revision as of 20:08, 18 September 2017

graycode
Pd graycode.png
Name Gray Code
Description Gray Code and Rotary Encoder
Status ??
License GPLv2+
Source code decoders/??
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. Sorry for that mislabeling.

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.

Resources