[jira] [Created] (MYNEWT-828) SensorAPI: Sensor OIC notifications/triggers

["Vipul Rahane (JIRA)" <ji...@apache.org>]

Vipul Rahane created MYNEWT-828:
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             Summary: SensorAPI: Sensor OIC notifications/triggers
                 Key: MYNEWT-828
                 URL: https://issues.apache.org/jira/browse/MYNEWT-828
             Project: Mynewt
          Issue Type: New Feature
      Security Level: Public (Viewable by anyone)
            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, this needs to be investigated further). 



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