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The resistance member in ccs811_reading struct is an unsigned 16-bit integer variable used to store RAW_DATA register bytes read from CCS811. It is kind of misleading to name this struct member as resistance. About the RAW_DATA register bytes, the CCS811 datasheet states that: ----- Two byte read only register which contains the latest readings from the sense resistor. The most significant 6 bits of the Byte 0 contain the value of the current through the sensor (0μA to 63μA). The lower 10 bits contain (as computed from the ADC) the readings of the voltage across the sensor with the selected current (1023 = 1.65V)" ----- Hence, the RAW_DATA register byte contains information about electric current and voltage of the CCS811 sensor. Calling this struct member 'resistance' is kind of misleading, although both electric current and voltage are needed to calculate the electrical resistance of the sensor using Ohm's law, V = I x R, in which a new channel type of IIO_RESISTANCE may be added to the driver in the future. Signed-off-by: Richard Lai <richard@richardman.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> |
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| Kconfig | ||
| Makefile | ||
| ams-iaq-core.c | ||
| atlas-ph-sensor.c | ||
| ccs811.c | ||
| vz89x.c | ||