Re: [libgpiod] Request an output line, without modifying the value

[Peter Rosin <peda@xxxxxxxxxx>]

On 2021-04-24 08:21, Kent Gibson wrote:
> On Fri, Apr 23, 2021 at 05:32:15PM +0200, Peter Rosin wrote:
>> Hi!
>>
>> I'm wondering if there is a way to request an output line using
>> libgpiod without clobbering the previous value. I would like for
>> an application to take a peek at this previous value of an output
>> gpio and behave slightly different for 0/1.
>>
>> Cheers,
>> Peter
> 
> Assuming it is still an output then GPIOD_LINE_REQUEST_DIRECTION_AS_IS
> should do what you are after.
> But there is no guarantee that the line state is preserved across
> requests, so YMMV.

Excellent suggestion, I'll try that. And now I of course feel silly for
not seeing it myself, it's so obvious...

Thanks a bunch!

Cheers,
Peter