Messages in this thread | | | Date | Mon, 1 Dec 2014 15:08:45 +0100 | Subject | Re: iio: dht11 broken | From | Linus Walleij <> |
| |
On Mon, Dec 1, 2014 at 11:59 AM, Richard Weinberger <richard@nod.at> wrote: > Am 01.12.2014 um 11:49 schrieb Harald Geyer:
>> Any input from gpiolib people about what the proper fix would be in >> their opinion, of course is appreciated. I don't think the dht11 driver >> is doing anything unreasonable per se, so maybe they can clarify how >> the API is intended to be used? > > Your driver sets up a GPIO as IRQ and then you switch the mode to output > to enable the DHT sensor. > This is not an API issue, it is an design issue. > I'm not a hardware expert but AFAIK setting an IRQ pin into output mode can > lead to undefined behavior.
Well that check is there exactly to prevent madness like this.
IRQs on pins set to output *does* *not* *make* *sense*.
Remove the IRQ before setting the pin to output and vice versa and everyone will be happier.
Yours, Linus Walleij
| |