I am using the gpiod package for manipulating GPIO inputs/outputs on a
Beaglebone Black SBC (like a Raspberry Pi but with more flexible I/O).
Mostly I am managing to get things to work as I want but better
documentation of gpiod would be a great help.
For example, when one has found an I/O pin (a 'line' in GPIO parlance)
that one wants to use one has to 'request' it using the Line.request()
method.
The help for this is as follows:-
Help on method_descriptor:
request(...)
request(consumer[, type[, flags[, default_val]]]) -> None
Request this GPIO line.
consumer
Name of the consumer.
type
Type of the request.
flags
Other configuration flags.
default_val
Default value of this line.
Note: default_vals argument (sequence of default values passed down to
LineBulk.request()) is still supported for backward compatibility but is
now deprecated when requesting single lines.
Which is pretty good **except** that I can't find a proper description
of the parameters anywhere, i.e. there's nowhere that even tells me
what types of values/objects the parameters are. At the end of the
gpiod.Line section of the help there is this:-
| ACTIVE_HIGH = 1
|
| ACTIVE_LOW = 2
|
| BIAS_AS_IS = 1
|
| BIAS_DISABLE = 2
|
| BIAS_PULL_DOWN = 4
|
| BIAS_PULL_UP = 3
|
| DIRECTION_INPUT = 1
|
| DIRECTION_OUTPUT = 2
Which **might** be appropriate values for 'type' or 'flags' but there
doesn't seem to be any way of knowing.
Am I missing something very obvious somewhere? Is there a 'standard'
way of finding out parameter information?
It may well be that I'm simply banging up against the limit of what
documentation is available, I have managed to get code working OK.
It's just that I'd be happier if I really know what I was doing! :-)
--
Chris Green
ยท
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