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https://issues.apache.org/jira/browse/MYNEWT-828?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vipul Rahane updated MYNEWT-828:
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Component/s: Sensor Framework
Drivers
> SensorAPI: Sensor OIC notifications/triggers, polling & interrupt
> based(lis2dh12)
> ---------------------------------------------------------------------------------
>
> Key: MYNEWT-828
> URL: https://issues.apache.org/jira/browse/MYNEWT-828
> Project: Mynewt
> Issue Type: New Feature
> Security Level: Public(Viewable by anyone)
> Components: Drivers, Sensor Framework
> Reporter: Vipul Rahane
> Assignee: Vipul Rahane
> Fix For: v1_2_0_rel
>
>
> - Add API for setting threshold based on polling mechanism
> - Also allow the API to set thresholds based on interrupts mechanism
> - Design is as follows:
> i. It adds a list of structures sensor_traits_list to the sensor structure
> which keeps track of per type thresholds, oic resources, algorithm, etc.
> These thresholds are then compared with the readings from the sensor at the
> specific poll rates based on algorithms decided by the developer:
> <SENSOR_THRESH_ALGO_WINDOW> and <SENSOR_THRESH_ALGO_WATERMARK>.
> <SENSOR_THRESH_ALGO_WINDOW>: Sensor data is compared to thresholds making a
> window.
> <SENSOR_THRESH_ALGO_WATERMARK>: Sensor data is compared to thresholds based
> on watermarks
> Notifications are sent if conditions are satisfied as per the above
> algorithms.
> If a set_thresh callback is specified in the driver, this callback will get
> called which will enable interrupts based notifications for specific sensor
> drivers. An example of this can be seen in
> [hw/drivers/sensors/lis2dh12/src/lis2dh12.c](https://github.com/apache/mynewt-core/compare/master...vrahane:sensor_notif?expand=1#diff-18789c89dd99a5f02122ee67a80b82a1).
> ii. Syscfg <SENSOR_OIC_PERIODIC>: This is a new syscfg which enables or
> disables periodic observation of sensor resources. By default it is enabled
> in the sensors test app.
> iii. There were two fields added to <struct sensor_itf>: <si_low_pin> &
> <si_high_pin> which lets the developer specify the interrupt pins in the bsp
> along with the interface and chip select if any.
> iv. A lot of functions were added to the lis2dh12 driver to support interrupt
> functionality.
> (The current interrupt config for lis2dh12 enables the low thresh interrupts
> and high thresh interrupts but it somehow only generates an interrupt on a
> change in the accelerometer data crossing a threshold instead of generating
> one based on threshold regardless, this needs to be investigated further).
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