blob: 585962ad046552e7d0e396b6d9b185ea616361bc [file] [log] [blame]
Christoph Mair5bf1d292010-08-09 17:20:28 -07001What: /sys/bus/i2c/devices/<busnum>-<devaddr>/pressure0_input
2Date: June 2010
3Contact: Christoph Mair <christoph.mair@gmail.com>
4Description: Start a pressure measurement and read the result. Values
5 represent the ambient air pressure in pascal (0.01 millibar).
6
7 Reading: returns the current air pressure.
8
9
10What: /sys/bus/i2c/devices/<busnum>-<devaddr>/temp0_input
11Date: June 2010
12Contact: Christoph Mair <christoph.mair@gmail.com>
13Description: Measure the ambient temperature. The returned value represents
14 the ambient temperature in units of 0.1 degree celsius.
15
16 Reading: returns the current temperature.
17
18
19What: /sys/bus/i2c/devices/<busnum>-<devaddr>/oversampling
20Date: June 2010
21Contact: Christoph Mair <christoph.mair@gmail.com>
22Description: Tell the bmp085 to use more samples to calculate a pressure
23 value. When writing to this file the chip will use 2^x samples
24 to calculate the next pressure value with x being the value
25 written. Using this feature will decrease RMS noise and
26 increase the measurement time.
27
28 Reading: returns the current oversampling setting.
29
30 Writing: sets a new oversampling setting.
31 Accepted values: 0..3.