forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.8 KiB
48 lines
1.8 KiB
3 years ago
|
What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain
|
||
|
|
What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain_bias
|
||
|
|
KernelVersion: 4.18
|
||
|
|
Contact: [email protected]
|
||
|
|
Description:
|
||
|
|
This sensor has an automatic gain control (agc) loop
|
||
|
|
which sets the analog signal levels at an optimum
|
||
|
|
level by controlling programmable gain amplifiers. The
|
||
|
|
criteria for optimal gain is determined by the sensor.
|
||
|
|
|
||
|
|
Return the actual gain value as an integer in [0; 65536]
|
||
|
|
range when read from.
|
||
|
|
|
||
|
|
The agc gain read when measuring crosstalk shall be
|
||
|
|
written into in_proximity0_agc_gain_bias.
|
||
|
|
|
||
|
|
What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_a
|
||
|
|
What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_b
|
||
|
|
What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_a
|
||
|
|
What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_b
|
||
|
|
KernelVersion: 4.18
|
||
|
|
Contact: [email protected]
|
||
|
|
Description:
|
||
|
|
The sensor is able to perform correction of distance
|
||
|
|
measurements due to changing temperature and ambient
|
||
|
|
light conditions. It can be programmed to correct for
|
||
|
|
a second order error polynomial.
|
||
|
|
|
||
|
|
Phase data has to be collected when temperature and
|
||
|
|
ambient light are modulated independently.
|
||
|
|
|
||
|
|
Then a least squares curve fit to a second order
|
||
|
|
polynomial has to be generated from the data. The
|
||
|
|
resultant curves have the form ax^2 + bx + c.
|
||
|
|
|
||
|
|
From those two curves, a and b coefficients shall be
|
||
|
|
stored in in_proximity0_calib_phase_temp_a and
|
||
|
|
in_proximity0_calib_phase_temp_b for temperature and
|
||
|
|
in in_proximity0_calib_phase_light_a and
|
||
|
|
in_proximity0_calib_phase_light_b for ambient light.
|
||
|
|
|
||
|
|
Those values must be integer in [0; 8355840] range.
|
||
|
|
|
||
|
|
Finally, the c constant is set by the sensor
|
||
|
|
internally.
|
||
|
|
|
||
|
|
The value stored in sensor is displayed when read from.
|