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-rw-r--r--Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector b/Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector
index 2071f9bcfaa5..1c2a07f7a75e 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector
+++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector
@@ -5,7 +5,8 @@ Contact: Peter Rosin <peda@axentia.se>
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:
+ of a comparator wired to an interrupt pin. Like so::
+
_
| \
input +------>-------|+ \
@@ -19,10 +20,12 @@ Description:
| 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.