Re: libgpib: IBOPENDEV ioctl failed

[Emmanuel Mayssat <emmanuel_mayssat@lynceantech.com>]

On Fri, 2008-01-11 at 18:18 +0800, zhangdemin99 wrote:
> Dear all,
>  I am trying to communicate the gpib device with asyn.when running
> application,there is no error. 

Are you saying you can start the ioc without it crashing?
Or are you saying that you can communicate with the device if you do not
use the dbpf function?


> But when I use the command dpf,it says:
> epics> dbl
> PSM6003:PSM6003Record:current
> PSM6003:PSM6003Record:current-step
> epics> dbpf PSM6003:PSM6003Record:current-step 0.5
> DBR_STRING:          0.5
> epics> libgpib: IBOPENDEV ioctl failed
> libgpib: ibfind failed to get descriptor
> 2008/01/11 15:30:20.803 L0 addr -1 : EDVR 0: OS error.
> 2008/01/11 15:30:20.804  151042680 autoConnect could not connect

Check iberr error codes
http://linux-gpib.sourceforge.net/doc_html/r530.html
You problem seems to be at the OS level.
Do you have read/write rights on the /dev/gpib* files?

>  
> The gpib_config file is:
> interface {
>         minor = 0     
>         board_type = "ni_pci"   
>         name = "L0"     
>         pad = 0 
>         sad = 0 
>         timeout = T3s   
>         eos = 0x0a      
>         set-reos = yes  
>         set-bin = no    
>         set-xeos = no   
>         set-eot = yes   
>         base = 0x310               
>         irq  = 7      
>         dma  = 0  
>         master = yes
> 
> }

Try a stripped down version of your configuration file like the one
below. Where did you get your irq/base/dma settings? You probably don't
need them anyway.

interface {
        minor = 0               /* interface config for /dev/gpib0 */
        board_type = "ni_pci"   /* type of interface board being used */
        name = "L0"             /* optional name, allows you to get a
board descriptor using ibfind() */
        pad = 0                 /* primary address of interface */
        eos = 0x0a              /* end of string is line-feed */
        set-eot = yes           /* send EOI at end of writes */
        timeout = T3s           /* timeout for commands */
        master = yes            /* board is system controller */
}

Cheers,
--
E