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Re: [microblaze-uclinux] Questions about the uClinux GPIO-Driver
Hi Johann,
thanks, now I can compile it right!
Nadine
-------- Original-Nachricht --------
Datum: Mon, 16 Jul 2007 10:54:09 +0200
Von: j.pfefferl@xxxxxxxxx
An: microblaze-uclinux@xxxxxxxxxxxxxx
Betreff: Re: [microblaze-uclinux] Questions about the uClinux GPIO-Driver
> Hello Nadine,
>
> you have to compile the application in a so called "out-of-tree" way.
> The attachment includes a Makefile and the C source file of the
> application.
>
> If you want to use this setup you still have to adjust the ROOTDIR
> variable on top of the Makefile. This variable must point to the
> uClinux-dist directory.
>
> Please also make sure that the /dev/xgpio device exists in your root
> filesystem and that the major and minor numbers of the device are correct.
>
> Hope this helps,
> Hans
>
> Dr. Johann Pfefferl <j.pfefferl@xxxxxxxxx> wrote:
> > Hello Nadine,
> >
> > here is a little program I have written to test the GPIO functionality:
> >
> > ----------------------- snip ----------------------------------------
> > #include <fcntl.h>
> > #include <string.h>
> > #include <unistd.h>
> > #include <errno.h>
> > #include <sys/ioctl.h>
> > #include <linux/ibm_ocp_gpio.h>
> >
> > int main(void)
> > {
> > int r, gpio_dev;
> > if(0 < (gpio_dev = open("/dev/xgpio", O_RDWR))) {
> > struct ibm_gpio_ioctl_data gpio_info;
> > memset(&gpio_info, 0, sizeof(gpio_info));
> > gpio_info.device = 0; /* Read the first gpio subdevice */
> > /* Mark all pins as input */
> > gpio_info.mask = ~0;
> > if(0 > (r = ioctl(gpio_dev, IBMGPIO_TRISTATE, &gpio_info)))
> > perror("ioctl IBMGPIO_TRISTATE failed: %s", g_strerror(errno));
> >
> > while(1) {
> > gpio_info.device = 0; /* Read the first gpio subdevice */
> > if(0 > (r = ioctl(gpio_dev, IBMGPIO_IN, &gpio_info)))
> > perror("ioctl failed: r=%d errno=%d %s", r, errno,
> strerror(errno));
> > else
> > printf("gpio_info: device=%d mask=%x data=0x%x\n",
> gpio_info.device, gpio_info.mask, gpio_info.data);
> > usleep(100000);
> > }
> > }
> > close(gpio_dev);
> > return 0;
> > }
> > ----------------------- snip ----------------------------------------
> >
> > It handles only the input of data. If you want to output something you
> > have to set the data into the variable
> >
> > gpio_info.data = 0xblablabla;
> >
> > and then perform a IBMGPIO_OUT ioctl.
> >
> > You must set the TRISTATE mask correctly to get input/output working
> > correctly for one GPIO subdevice!!!
> >
> > Hope this helps,
> > Johann Pfefferl
> >
> > Nadine Seyberlich <Serina16@xxxxxxx> wrote:
> > > Hi all,
> > >
> > > i'm writing my diploma thesis, where i have to use the SUZAKU-S
> (SZ130-U00) with the Microblaze and uClinux as basis. To the Board over the GPIO
> Pins is external hardware connected.
> > > I have seen that there is a ready GPIO-Driver in uClinux. How can I
> use this driver?
> > > How can I respond the driver from a C-Program? Can the GPIO pins be
> addressed directly or do I have to write a separate module for the adressing?
> How complex is this way? Does someone have a sample program, where I can
> see the use of the GPIO driver?
> > >
> > > Thanks for your help.
> > >
> > > Nadine
> > > --
> > > Psssst! Schon vom neuen GMX MultiMessenger gehört?
> > > Der kanns mit allen: http://www.gmx.net/de/go/multimessenger
> > > ___________________________
> > > microblaze-uclinux mailing list
> > > microblaze-uclinux@xxxxxxxxxxxxxx
> > > Project Home Page :
> http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> > > Mailing List Archive :
> http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
> >
> > --
> > Dr. Johann Pfefferl ------------ mailto j.pfefferl at eubus dot net
> > Eubus GmbH http://www.eubus.net +++++ http://www.hydraxc.com
> > Gollierstr. 70
> > D-80339 Muenchen
> > Phone: +49 (0)89 45 22 578-67 Fax: +49 (0)89 45 22 578-55
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> >
> > ==
> > -o) A computer program does what you tell it to do,
> > /\\ not what you want it to do.
> > _\_v-
> >
> > ___________________________
> > microblaze-uclinux mailing list
> > microblaze-uclinux@xxxxxxxxxxxxxx
> > Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> > Mailing List Archive :
> http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
>
> --
> Dr. Johann Pfefferl ------------ mailto j.pfefferl at eubus dot net
> Eubus GmbH http://www.eubus.net +++++ http://www.hydraxc.com
> Gollierstr. 70
> D-80339 Muenchen
> Phone: +49 (0)89 45 22 578-67 Fax: +49 (0)89 45 22 578-55
> Registergericht Muenchen HRB 145 336, Ust-Id Nr. DE 225 783 933
> Geschaeftsfuehrer: Volker Ulrich, Peter Sibities
>
> ==
> -o) A computer program does what you tell it to do,
> /\\ not what you want it to do.
> _\_v-
--
Psssst! Schon vom neuen GMX MultiMessenger gehört?
Der kanns mit allen: http://www.gmx.net/de/go/multimessenger
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