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Re: [microblaze-uclinux] Using fslfifo driver

Excellent, I was interested in this topic as well.

Thanks for the example

Jonathan

On Oct 26, 2005, at 1:39 AM, Claudio Lanconelli wrote:


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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