Messages in this thread | | | From | Andy Shevchenko <> | Date | Fri, 26 Apr 2019 20:20:19 +0300 | Subject | Re: [PATCH 2/2] gpio: sch: Add interrupt support |
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On Fri, Apr 26, 2019 at 7:05 PM Jan Kiszka <jan.kiszka@siemens.com> wrote: > > On 26.04.19 16:42, Enrico Weigelt, metux IT consult wrote: > > On 26.04.19 15:36, Jan Kiszka wrote: > > > >> At the same time, there are no real alternatives - to my> knowledge - for the value it brings (various bindings) to simply > > switch> the engine. > > Which value exactly does that collection of crude wrappers and broken > > attempts to buypass the kernel (driving gpios via /dev/mem *facepalm*) > > provide ? > > Leaving that blunt hack aside: > > import mraa > > pin = mraa.Gpio(13) > pin.dir(mraa.DIR_OUT) > pin.write(1) > > And the same goes for nodejs, java and c++. > > Moreover, this allows you to abstract away where "Pin 13" actually came from on > that board if the kernel changes (BSP -> upstream...) or the extension board or > ...
The problem here is opaque number. This has to be chip + *relative* pin number/ See this: https://stackoverflow.com/questions/55532410/how-do-linux-gpio-numbers-get-their-values/55579640#55579640
-- With Best Regards, Andy Shevchenko
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