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7.7.1.4 Use data in application
int32_t
app_pressure
= press_data.pressure.value;
uint32_t app_read_time = press_data.timestamp;
7.8 Temperature
Unlike most other types of measurement, temperature readings may come from either
a dedicated temperature sensor or from a device that has a different primary sensor
function but can provide temperature data as a secondary output value.
Dedicated temperature sensors generally provide stable, high-accuracy readings. The
secondary temperature data from other types of sensor devices are typically used
internally for temperature compensation of the primary measurement, and these
temperature readings often have fairly loose accuracy specifications.
The sensor_get_temperature() function allows access to temperature data from
any sensors that support such measurements. No special device initialization is
required to enable temperature measurement as a secondary function. The function
takes the following form:
sensor_get_temperature (&device, &temp_data);
where device is the device descriptor of the sensor device to use for the temperature
measurement and temp_data is a sensor_data_t structure to receive the
temperature data.
Temperature data can be obtained from multiple sensor devices in a single
application, if desired. Simply specify a different device descriptor when calling
sensor_get_temperature() .
Scaled temperature measurements are expressed in degrees Celsius. When the
function returns, the value can be read from the temp_data structure using the
temperature.value field.
7.8.1 Example code sequence
This example shows how a temperature reading is obtained from both a dedicated
temperature sensor and a gyroscope sensor. An equivalent sequence can be used to
read the temperature from a different type of sensor that supports temperature
measurement.
7.8.1.1 Definitions and declarations
#include "sensor.h"
sensor_t
sensor_data_t
temp_dev;
temp_data;
// device descriptor
// temperature data from device
7.8.1.2 Sensor initialization
To initialize a dedicated temperature sensor, use the following:
sensor_attach (&temp_dev, SENSOR_TYPE_TEMPERATURE, 0, 0);
Sensor initialization only needs to be done once per sensor device, even if it will be
used for both temperature and another (primary) sensing function.
NOTE
The specified type is for the primary function of the sensor (not the secondary
temperature function).
20
Atmel AVR4016
8367B-AVR-06/11
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