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- What: /sys/bus/iio/devices/iio:deviceX/in_altvoltageY_invert
- Date: October 2016
- KernelVersion: 4.9
- Contact: Peter Rosin <[email protected]>
- Description:
- The DAC is used to find the peak level of an alternating
- voltage input signal by a binary search using the output
- of a comparator wired to an interrupt pin. Like so::
- _
- | \
- input +------>-------|+ \
- | \
- .-------. | }---.
- | | | / |
- | dac|-->--|- / |
- | | |_/ |
- | | |
- | | |
- | irq|------<-------'
- | |
- '-------'
- The boolean invert attribute (0/1) should be set when the
- input signal is centered around the maximum value of the
- dac instead of zero. The envelope detector will search
- from below in this case and will also invert the result.
- The edge/level of the interrupt is also switched to its
- opposite value.
- What: /sys/bus/iio/devices/iio:deviceX/in_altvoltageY_compare_interval
- Date: October 2016
- KernelVersion: 4.9
- Contact: Peter Rosin <[email protected]>
- Description:
- Number of milliseconds to wait for the comparator in each
- step of the binary search for the input peak level. Needs
- to relate to the frequency of the input signal.
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