How do I use the "match" parameter in a flex decoder?

[David Powell]

I have a need to use the match parameter in a flex decoder, but can't figure out how to use it on the id: tag. This is my decoder:

decoder {
    name=DrivewayAlert,
    modulation=OOK_PWM,
    short=670,
    long=1340,
    reset=2000,
    bits=9,
    get=@4:{1}:battery_ok:[0:1 1:0],
    get=@5:{4}:id,
    sync=3800
}

I can make it match the full 9-bit data field with match={9}720, but that value changes with the status of the battery.  The id field begins in bit 5 of the data field, so it doesn't change, but I can't figure out how to tell the match parameter to just look at bits 5-8 of the data field. 

Can someone please explain how that works?

Thanks, David

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[Christian Z.]

The "match"-option just matches the given bits anywhere in the data. If your ID is "9" then use match=9 or match={4}9

Not a very good filter with only 4 bits and we currently don't support matching at a fixed position, sorry.

[David Powell]

Hmmm... in that case, can I use more than one "match" option on the decoder?  I could match the entire 9-bit data field twice, once with the battery bit set to 1 and once with it set to 0.  Then it would trigger either way.

dp

On 11/6/23 5:44 AM, Christian Z. wrote:

The "match"-option just matches the given bits anywhere in the data. If your ID is "9" then use match=9 or match={4}9

Not a very good filter with only 4 bits and we currently don't support matching at a fixed position, sorry.

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[Christian Z.]

You can't use two matches, but you can use two decoders, they are pretty light-weight. It's not good practice to reuse the decoder name, but it is possible.