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- 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.
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