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8.6 Example code sequences
8.6.1 Motion detection event
The following example shows how to set up and use a motion detection event
generated from an accelerometer sensor. The overall sequence will be similar for
other sensor or event types.
8.6.1.1 Definitions and declarations
#include "sensor.h"
sensor_t
accel_dev;
// device descriptor
sensor_event_desc_t
accel_event; // event descriptor
sensor_data_t
accel_data;
// data from event handler
8.6.1.2 Sensor and event initialization
sensor_attach (&accel_dev, SENSOR_TYPE_ACCELEROMETER, 0, 0);
accel_event = {
.sensor
= &accel_dev,
// use accelerometer
.event
= SENSOR_EVENT_MOTION, // motion detect event
.data.scaled = true,
// return scaled data
};
.handler
.arg
.enabled
= accel_handler,
= &accel_data,
= true
// address of handler
// where to put data
// enable event
sensor_add_event (&accel_event);
// add event
8.6.1.3 Sensor event handler routine
void accel_handler (volatile void * in)
{
// Set pointer to input descriptor address
sensor_event_desc_t * const event = (sensor_event_desc_t *) in;
// Copy data – note 'arg' = address of 'accel_data' structure
*((sensor_data_t *)(event->arg)) = event->data;
/* do other stuff (set a flag for application, etc.) */
}
8.6.2 Tap detection event
The following example shows how to set up and use a tap detection event generated
from an accelerometer sensor. The initialization is somewhat different from other
events because the tap detection involves a number of configurable timing and
intensity threshold parameters. The sensor_set_tap() function is used to set the
various parameters that affect tap detection.
24
Atmel AVR4016
8367B-AVR-06/11
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