48 lines
1.8 KiB
Plaintext
48 lines
1.8 KiB
Plaintext
What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain
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What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain_bias
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KernelVersion: 4.18
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Contact: linux-iio@vger.kernel.org
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Description:
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This sensor has an automatic gain control (agc) loop
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which sets the analog signal levels at an optimum
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level by controlling programmable gain amplifiers. The
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criteria for optimal gain is determined by the sensor.
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Return the actual gain value as an integer in [0; 65536]
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range when read from.
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The agc gain read when measuring crosstalk shall be
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written into in_proximity0_agc_gain_bias.
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What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_a
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What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_b
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What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_a
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What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_b
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KernelVersion: 4.18
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Contact: linux-iio@vger.kernel.org
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Description:
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The sensor is able to perform correction of distance
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measurements due to changing temperature and ambient
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light conditions. It can be programmed to correct for
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a second order error polynomial.
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Phase data has to be collected when temperature and
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ambient light are modulated independently.
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Then a least squares curve fit to a second order
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polynomial has to be generated from the data. The
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resultant curves have the form ax^2 + bx + c.
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From those two curves, a and b coefficients shall be
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stored in in_proximity0_calib_phase_temp_a and
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in_proximity0_calib_phase_temp_b for temperature and
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in in_proximity0_calib_phase_light_a and
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in_proximity0_calib_phase_light_b for ambient light.
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Those values must be integer in [0; 8355840] range.
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Finally, the c constant is set by the sensor
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internally.
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The value stored in sensor is displayed when read from.
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