Date: Mon, 25 Nov 2013 10:59:53 -0500 From: Lowell Gilbert <freebsd-ports-local@be-well.ilk.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: ports@FreeBSD.org Subject: Re: Porting a software which uses INP_GPIO? Message-ID: <44pppo79qe.fsf@lowell-desk.lan> In-Reply-To: <20131122225042.00007aad@unknown> (Alexander Leidinger's message of "Fri, 22 Nov 2013 22:50:42 %2B0100") References: <20131121214359.000006f6@unknown> <44bo1d5u3z.fsf@be-well.ilk.org> <20131122225042.00007aad@unknown>
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Alexander Leidinger <Alexander@Leidinger.net> writes:
> On Thu, 21 Nov 2013 16:21:20 -0500
> Lowell Gilbert <freebsd-ports-local@be-well.ilk.org> wrote:
>
>> Alexander Leidinger <Alexander@Leidinger.net> writes:
>>
>> > I try to compile a software on FreeBSD which wants to use INP_GPIO,
>> > OUTP_GPIO and some oder *GPIO* things.
>> >
>> > A quick googling shows me some raspberry pi sites. Is this something
>> > linux-specific (so that I can forget this software on FreeBSD as
>> > long as we don't gain something similar)?
>> >
>> > Searching for gpio in names of ports didn't show a hit and in the
>> > basesystem includes I can't find it either.
>>
>> GPIO is a way to do pin assignments for a chip package at run-time. I
>> use it on embedded platforms all the time, but it isn't normally
>> available on a PC. There's a gpioctl(1) that should be able to set the
>> a pin for input or output, as those flags indicate, or
>> programmatically I guess it would be GPIO_PIN_INPUT or
>> GPIO_PIN_OUTPUT in /usr/include/sys/gpio.h but again, you need to
>> have the hardware for it.
>
> I have the hardware. Currently it is accessed from an old Laptop with
> the Windows-binary of the program. I would like to replace the Laptop
> and use a FreeBSD version of the program.
>
> The code in question is:
> ---snip---
> const int banks[4]={18,23,24,25};
> [...]
> for(i=0;i<4;i++)
> {
> INP_GPIO(banks[i]);
> OUT_GPIO(banks[i]);
> if(i==bank)
> {
> GPIO_SET = 1 << banks[i]; // enable bank
> }
> else
> {
> GPIO_CLR = 1 << banks[i];// disable bank
> }
> }
> ---snip---
>
> When looking at sys/gpio.h, I have no idea how I shall translate the
> above into something FreeBSD understands. Could you please explain how
> the above translates into "FreeBSD-gpio-speak"?
Not offhand, no; that would take some work, and would require some
knowledge of the hardware devices installed, and preferably their wiring
configurations as well. It would be a reasonable guess that INP_GPIO is
equivalent to a GPIOSETCONFIG with a state structure that (at least)
includes GPIO_PIN_INPUT in its flags.
But the code seems to be operating on whole banks at once, no just
individual pins.
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