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https://issues.apache.org/jira/browse/MYNEWT-703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vipul Rahane closed MYNEWT-703.
-------------------------------
Resolution: Fixed
> SensorAPI: Add cputime timestamps and timeofday to SensorAPI samples
> --------------------------------------------------------------------
>
> Key: MYNEWT-703
> URL: https://issues.apache.org/jira/browse/MYNEWT-703
> Project: Mynewt
> Issue Type: Improvement
> Reporter: Vipul Rahane
> Assignee: Vipul Rahane
> Fix For: v1_1_0_rel
>
>
> This would help in doing interpolation of data coming from different sensors
> in a sensor network with sensors connected to different nodes.
> If multiple sensors are connected to the same device, this would help in
> implementing sensor fusion algorithms.
> After going back and forth on various designs this is the one I have
> finalized and implemented and works great IMO.
> Design:
> sensor timestamp update os_callout fires every 2000 seconds and avoids
> multiple overflows of the os_timeval.tv_usec fields filling up global
> os_timeval structure which gets updated every time a sensor is read.
> There is also a timestamp which is part of the sensor structure which gets
> filled up every time a sensor is read.
> The seconds, micro seconds and cputime field gets updated accordingly.
> Following is an output of the timestamped samples:
> {noformat}
> sensor read color0 0x20000000 -n 10 -i 100
> 864:ts: [ secs: 6 usecs: 777617 cputime: 7212189 ]
> 865:r = 101, g = 111, b = 118, c = 243,
> 866:lux = 21, cct = 6317K, ir = 43,
> 867:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.176954736, max lux
> = 11029,
> 877:ts: [ secs: 6 usecs: 877631 cputime: 7312203 ]
> 878:r = 101, g = 111, b = 118, c = 243,
> 879:lux = 21, cct = 6317K, ir = 43,
> 880:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.176954736, max lux
> = 11029,
> 889:ts: [ secs: 6 usecs: 977645 cputime: 7412217 ]
> 890:r = 101, g = 111, b = 118, c = 243,
> 891:lux = 21, cct = 6317K, ir = 43,
> 892:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.176954736, max lux
> = 11029,
> 902:ts: [ secs: 7 usecs: 77659 cputime: 7512231 ]
> 903:r = 101, g = 111, b = 118, c = 243,
> 904:lux = 21, cct = 6317K, ir = 43,
> 905:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.176954736, max lux
> = 11029,
> 915:ts: [ secs: 7 usecs: 177673 cputime: 7612245 ]
> 916:r = 101, g = 112, b = 118, c = 243,
> 917:lux = 21, cct = 6337K, ir = 44,
> 918:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.181069952, max lux
> = 11029,
> 927:ts: [ secs: 7 usecs: 277687 cputime: 7712259 ]
> 928:r = 101, g = 112, b = 118, c = 243,
> 929:lux = 21, cct = 6337K, ir = 44,
> 930:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.181069952, max lux
> = 11029,
> 940:ts: [ secs: 7 usecs: 377701 cputime: 7812273 ]
> 941:r = 101, g = 111, b = 118, c = 243,
> 942:lux = 21, cct = 6317K, ir = 43,
> 943:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.176954736, max lux
> = 11029,
> 953:ts: [ secs: 7 usecs: 477715 cputime: 7912287 ]
> 954:r = 101, g = 111, b = 118, c = 243,
> 955:lux = 21, cct = 6317K, ir = 43,
> 956:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.176954736, max lux
> = 11029,
> 965:ts: [ secs: 7 usecs: 577729 cputime: 8012301 ]
> 966:r = 101, g = 112, b = 118, c = 244,
> 967:lux = 22, cct = 6317K, ir = 43,
> 968:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.176229504, max lux
> = 11029,
> 978:ts: [ secs: 7 usecs: 677743 cputime: 8112315 ]
> 979:r = 101, g = 112, b = 118, c = 244,
> 980:lux = 22, cct = 6317K, ir = 43,
> 981:sat = 65535, sat75 = 65535, not saturated, cRatio = 0.176229504, max lux
> = 11029,
> {noformat}
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