Lines Matching refs:signal

25 digital signal. They are provided from many kinds of chip, and are familiar
78 It is natural to assume that a GPIO is "active" when its output signal is 1
79 ("high"), and inactive when it is 0 ("low"). However in practice the signal of a
84 means "active") so that drivers only need to worry about the logical signal and
89 Sometimes shared signals need to use "open drain" (where only the low signal
90 level is actually driven), or "open source" (where only the high signal level is
92 used for TTL. A pullup or pulldown resistor causes the high or low signal level.
96 One common example of an open drain signal is a shared active-low IRQ line.
104  LOW:	gpiod_direction_output(gpio, 0) ... this drives the signal and overrides
108 	(or some other device) controls the signal.
111 high signal and configuring the GPIO as input for low. This open drain/open
114 If you are "driving" the signal high but gpiod_get_value(gpio) reports a low
116 driving the shared signal low. That's not necessarily an error. As one common