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Atmel AVR4016
The sensor_data_t structure also contains a special field which is set by your
application to specify whether the sensor read function should return scaled units or
raw readings. This field should be set before calling the sensor read function.
The final field in the sensor_data_t structure is a high-resolution timestamp value
that provides an elapsed time value, expressed in microseconds (μs). This field is
updated during each sensor reading using an internal Atmel AVR system clock.
7.1.3 Measurement units
The Atmel Sensors Xplained API functions provide sensor results in real-world
(usually scientific or SI) units. These values are automatically scaled based on the
current device settings. And so if the output range setting for a device is changed, for
example, the scaled output will remain the same (subject to limitations of the device’s
precision in each range).
Many sensor readings are provided directly by the device, but require scaling or other
conversion to SI units. Other results (for example, magnetic heading) are calculated
by the Sensors Xplained functions based on lower-level sensor readings.
See Table 7-1 for the measurement units used for each type of sensor reading.
7.1.4 Reading “raw” values
Although it is normally preferable to obtain scaled values for sensor data, it is also
possible to read the internal “raw” values from the sensor. Raw values may be useful
for system setup or calibration, or for special operations that are specific to the sensor
being used.
To read raw values from a sensor device, set the scaled field in the sensor_data_t
data structure to false before calling the sensor’s read function (for example,
sensor_get_acceleration() or sensor_get_pressure() ).
When raw values are returned, they are not modified by the read function, and so the
actual values will vary, depending on the range setting for the device. However,
calibration offsets (such as those used for compass/magnetometer sensors) will be
applied to the returned values.
7.1.5 Timestamps
The timestamp field in the sensor_data_t structure is automatically filled with a
microsecond (μs) value from the AVR controller’s real-time clock when the sensor is
read. These timestamps can be used to determine the relative timing of multiple
sensor readings.
When the sensor read function returns, the timestamp can be read from the
sensor_data_t structure’s timestamp field.
7.2 Device ID and version
Most sensor devices provide an identifier value that can be read to determine the
sensor model. In many cases, the device version can also be read. The
sensor_device_id() function is a special routine that reads these values from the
sensor device and returns them in a sensor_data_t structure, similar to the way that
the actual sensor readings are returned. The function takes the following form:
sensor_device_id (&device, &id_data);
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8367B-AVR-06/11
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