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https://issues.apache.org/jira/browse/MYNEWT-669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vipul Rahane resolved MYNEWT-669.
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Resolution: Fixed
> SensorAPI: Change UNUSED_DATA indicator
> ---------------------------------------
>
> Key: MYNEWT-669
> URL: https://issues.apache.org/jira/browse/MYNEWT-669
> Project: Mynewt
> Issue Type: Improvement
> Reporter: Vipul Rahane
> Assignee: Vipul Rahane
> Fix For: v1_1_0_rel
>
>
> For unused data, UNUSED_DATA constant was being used which would be set to a
> value which is not used by the sensor data. Downside to this is:
> Eg: If it is defined to be -1 and for some reason sensor data is exactly -1,
> the data would get ignored by the SensorAPI.
> There are two ways to deal with this:
> 1. Use bit fields:
> Use bit fields for ensuring validity of the data. I use it for color sensor
> data. As compared to flags and the earlier constant data approach, this is
> very specific and can be used flexibly.
> 2. Use flags:
> Using flags is the same as using bit fields, the only downside is the bitwise
> comparison in if statements.
> My preferred approach:
> 1. Use bit fields.
> This is because of the advantages it has over flags and the constant data
> approach.
> Disadvantage:
> Over the air using bit fields might be a bit problematic, but the sensors
> data structures are internal and over the air we would not send the data
> structure itself(hopefully) but it would most probably be mapped to some
> other resource in an application protocol.
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