Re: [questions] : gpiolib and gpioset behaviour

[Kent Gibson <warthog618@xxxxxxxxx>]

On Fri, Apr 26, 2024 at 10:07:20AM +0800, Kent Gibson wrote:
> On Mon, Apr 22, 2024 at 06:49:05PM +0200, Gilles BULOZ wrote:
> > On Mon, Apr 22, 2024 at 3:55 PM Bartosz Golaszewski wrote :
> > > On Mon, Apr 22, 2024 at 2:44 PM Gilles BULOZ <gilles.buloz@xxxxxxxxxxx> wrote:
> > >>
>
> Note that the mask in gc->get_multiple() is unsigned long*, so it is a
> pointer to an array of unsigned long.  Its width is not limited by
> unsigned long, but by the bits parameter.  In your case the mask you pass
> should contain multiple unsigned longs to achieve 112 bits.
> Refer to gpiod_get_array_value_complex() for an example of building bitmap
> masks to pass to gc->get_multiple(), in that case via
> gpio_chip_get_multiple().
>

Bah, what was I saying here - both the mask AND bits parameters of
get_multiple()/set_multiple() are bitmaps of width gc->ngpio, where the
mask identifies the pins to get/set and bits contains the values.

My bad - must've been before the coffee soaked in.

Cheers,
Kent.