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7985e7c100
Currently IIO uses a decimal fixed point representations for real type numbers. This patch introduces a new representation for rational type numbers. The number will be expressed by specifying a numerator and denominator. For converting a raw value to a processed value multiply it by the numerator and divide it by the denominator. The reasoning for introducing this new type is that for a lot of devices the scale can be represented easily by a fractional number, but it is not possible to represent it as fixed point number without rounding. E.g. for a simple DAC the scale is often the reference voltage divided by the number of possible values (Usually 2**n_bits - 1). Each driver currently implements the conversion of this fraction to a fixed point number on its own. Also when it comes to the in-kernel interface this allows to directly use the fractional factors to convert a raw value to a processed value. This should on one hand require less instructions and on the other hand increase the precision. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org> |
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| .. | ||
| accel | ||
| adc | ||
| amplifiers | ||
| common | ||
| dac | ||
| frequency | ||
| gyro | ||
| light | ||
| magnetometer | ||
| iio_core_trigger.h | ||
| iio_core.h | ||
| industrialio-buffer.c | ||
| industrialio-core.c | ||
| industrialio-event.c | ||
| industrialio-trigger.c | ||
| industrialio-triggered-buffer.c | ||
| inkern.c | ||
| Kconfig | ||
| kfifo_buf.c | ||
| Makefile | ||