Difference between revisions of "Protocol decoder:Graycode"
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(Created page with "{{Infobox protocol decoder | id = graycode | name = graycode | description = Gray Code and Rotary Encoder | status = ?? | license...") |
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| probes = — | | probes = — | ||
| optional_probes = D0-D7 | | optional_probes = D0-D7 | ||
| options = numchannels, | | options = numchannels, edges, avg_period | ||
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== Parameters == | == Parameters == | ||
''' | '''edges''': 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. | '''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. | ||
Revision as of 21:03, 18 September 2017
 | |
| Name | graycode |
|---|---|
| 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: 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.