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field contains a sensor_data_t structure, which holds the actual sensor data
obtained during the event.
An event handler can be defined to be called only when a single, specific event
occurs, or a common handler can be defined which is called when any one of a set of
events occurs. To determine the actual event which initiated the call to the handler,
examine the event field within the sensor_event_desc_t structure, which will contain
a sensor_event_t type code indicating the event.
NOTE
Your event handler routine will be called as part of the interrupt processing,
asynchronously from the normal execution of your application. Because the handler
executes at interrupt level, other interrupts will be masked (prevented from being
serviced) while your handler is running. Therefore, you should structure your handler
and application to require a minimum of processing in the handler itself, and perform
subsequent work in your regular application code. This can be done by having the
handler set flags or state variables, which are checked during the regular cyclic
execution of your main program, to initiate additional actions to be taken.
8.3 Enabling and disabling events
After an event has been added, it can be dynamically enabled by calling the
sensor_enable_event()
function, or it can be disabled by calling the
sensor_disable_event() function. The event handler routine remains defined even
if the event is disabled, but the sensor device settings are changed so that the event
interrupt will not be generated.
8.4 Events with no handler routine
Normally, you will define a handler routine to be called when a specified sensor event
occurs so that it may process the sensor data or take other special action. However, it
is possible to add and enable a sensor event without providing your own handler
routine. This might be done when the simple act of the sensor generating an event
interrupt provides the required effect. For example, if the microcontroller is placed into
a low-power sleep mode, a motion detection interrupt from an accelerometer might be
used to wake up the system, with no further processing required.
To set up event handling without providing your own handler, call the
sensor_add_event() function as usual, but set the handler field to 0 (NULL).
8.5 Event types
There are many types of sensor events that might be generated, depending on the
specific sensor device. See the device driver descriptions in Chapter 9 , page 27 for
more information on the events that can be generated by each individual sensor.
Possible event types include:
? SENSOR_EVENT_NEW_DATA – new sensor data are available
? SENSOR_EVENT_MOTION – device motion has been detected, often used with
a programmable threshold for motion detection
? SENSOR_EVENT_LOW_G – low gravity (that is, free fall) detected
? SENSOR_EVENT_HIGH_G – high gravity (acceleration) detected
? SENSOR_EVENT_TAP – physical tap(s) on device detected
? SENSOR_EVENT_TILT – device tilt detected
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8367B-AVR-06/11
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