Atmel AVR4016
Not all accelerometer devices can generate tap detection events. See the individual
device driver descriptions in Chapter
9 , page
to determine if
SENSOR_EVENT_TAP is one of the supported event types.
8.6.2.1 Definitions and declarations
#include "sensor.h"
sensor_t
sensor_event_desc_t
sensor_data_t
sensor_tap_params_t
accel_dev;
tap_event;
tap_data;
tap_params;
// device descriptor
// event descriptor
// data from event handler
// tap detecion parameters
8.6.2.2 Sensor and event initialization
sensor_attach (&accel_dev, SENSOR_TYPE_ACCELEROMETER, 0, 0);
tap_params = {
.count
= 2,
// detect up to 2 taps
.axes = (SENSOR_TAP_AXIS_X | SENSOR_TAP_AXIS_Y |
SENSOR_TAP_AXIS_Z), // detect taps on all 3 axes
.threshold_min = 0,
.threshold_max = 0,
// use default min intensity
// use default max intensity
};
.total_time
.tap_time_min
.tap_time_max
.between_time
.ignore_time
= 400,
= 5,
= 50,
= 300,
= 100
// tap detect duration 400msec
// each tap must be >= 5msec
// each tap must be <= 50msec
// gap between taps <= 300msec
// gap between taps >= 100msec
sensor_set_tap (&accel_dev, &tap_params);
tap_event = {
// set tap parameters
.sensor
.event
= &accel_dev,
= SENSOR_EVENT_TAP,
// use accelerometer
// tap detect event
.data.scaled = true,
// return scaled data
};
.handler
.arg
.enabled
= tap_handler,
= &tap_data,
= true
// address of handler
// where to put data
// enable event
sensor_add_event (&accel_event);
// add event
25
8367B-AVR-06/11
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