修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector
..
..
@@ -5,7 +5,8 @@
5
5
 Description:
6
6
 		The DAC is used to find the peak level of an alternating
7
7
 		voltage input signal by a binary search using the output
8
-		of a comparator wired to an interrupt pin. Like so:
8
+		of a comparator wired to an interrupt pin. Like so::
9
+
9
10
 		                           _
10
11
 		                          | \
11
12
 		     input +------>-------|+ \
..
..
@@ -19,10 +20,12 @@
19
20
 		            |    irq|------<-------'
20
21
 		            |       |
21
22
 		            '-------'
23
+
22
24
 		The boolean invert attribute (0/1) should be set when the
23
25
 		input signal is centered around the maximum value of the
24
26
 		dac instead of zero. The envelope detector will search
25
27
 		from below in this case and will also invert the result.
28
+
26
29
 		The edge/level of the interrupt is also switched to its
27
30
 		opposite value.
28
31