From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- .../testing/sysfs-bus-iio-adc-envelope-detector | 39 ++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector (limited to 'Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector') diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector b/Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector new file mode 100644 index 000000000..1c2a07f7a --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector @@ -0,0 +1,39 @@ +What: /sys/bus/iio/devices/iio:deviceX/in_altvoltageY_invert +Date: October 2016 +KernelVersion: 4.9 +Contact: Peter Rosin +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 +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. -- cgit v1.2.3