Re: [microblaze-uclinux] Using fslfifo driver

[Claudio Lanconelli <lanconelli.claudio@xxxxxxxxx>]

Hi Arnaud,

this is an example of code using FSLFIFO for write, not guarantee it 
works or ever compile.
Just a starting point for you.

Regards,
Claudio Lanconelli

/*************************************/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>

#include <asm/fslfifo_ioctl.h>
#include <sys/ioctl.h>

#define FIFO_DEVICE    "/dev/fslfifo0"

int main(void)
{
   int fd;
   int rv;
   unsigned long val;

   fd = open(FIFO_DEVICE, O_RDWR);
   if (fd < 1)
   {
       printf("ERROR: failed to open FSLFIFO device %s\n", FIFO_DEVICE);
       return fd;
   }
   else
   {
       unsigned long arg;

       // Set the FIFO width (1, 2, 4 bytes)
       arg = 4;
       rv = ioctl(fd, FSLFIFO_IOCTWIDTH, arg);
       if (rv < 0)
       {
           printf("ERROR: ioctl(FSLFIFO_IOCTWIDTH,%d) failed, 
errno=%d\n", arg, errno);
           close(fd);
           return rv;
       }

       // Read back the FIFO width
       rv = ioctl(fd, FSLFIFO_IOCQWIDTH, arg);
       if (rv < 0)
       {
           printf("ERROR: ioctl(ofd, FSLFIFO_IOCQWIDTH) failed, 
errno=%d\n", errno);
           close(fd);
           return rv;
       }

       // Write a data value
       val = 0x55;
       rv = write(fd, &val, sizeof(val));
       if ( rv != sizeof(val) )
       {
           printf("ERROR: write(%s) failed, returned=%d, errno=%d\n", 
DACDEVICE, rv, errno);
       }

       // Write a control value
       val = 0xAA;
       rv = ioctl(fd, FSLFIFO_IOCTCONTROL, val);
       if (rv < 0)
       {
           printf("ERROR: ioctl(FSLFIFO_IOCTCONTROL,%d) failed, 
errno=%d\n", val, errno);
       }

       close(fd);
   }

   return 0;
}


Arnaud Lagger wrote:

> Thanks, so I can use directly "cat file > /dev/fslfifo0" :)
>
> But my dream would be a piece of C code which use fslfifo to write 
> some data and retrieve the result. Then I would be able to customize 
> it to control my FSL module.
>
> Arnaud Lagger
>
> Stephen Craven a écrit :
>
> > Having never tried this, I can't say if its relavent or not, but have 
> > a look
> > at this paper by John Williams:
> >
> >  http://doi.ieeecomputersociety.org/10.1109/FCCM.2005.35
> >
> > Stephen
> >
> > ----- Original Message ----- From: "Paul Hartke" <phartke@xxxxxxxxxxxx>
> > To: <microblaze-uclinux@xxxxxxxxxxxxxx>; "Arnaud Lagger"
> > <arnaud.lagger@xxxxxxx>
> > Cc: <microblaze-uclinux@xxxxxxxxxxxxxx>
> > Sent: Tuesday, October 25, 2005 12:21 PM
> > Subject: Re: [microblaze-uclinux] Using fslfifo driver
> >
> >
> >
> > > Sounds like a common task that folks including myself would want to do.
> > > Hopefully folks will post their experiences and we can collectively
> > > generate some guides for this.
> > >
> > > Thanks.
> > > Paul
> > >
> > > Quoting Arnaud Lagger <arnaud.lagger@xxxxxxx>:
> > >
> > > > Hello,
> > > >
> > > > I have an FSL module and I want to use the fslfifo driver to simply 
> > > > give
> > > > a data to the module and then retrieve it.
> > > > Can anyone give me some code to do that?
> > > >
> > > > Thanks,
> > > >
> > > > Arnaud Lagger
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