Re: Problem with device communication

Hello,

On Mon, 11 Oct 2021 22:24:54 -0400
Frank Mori Hess <[email protected]> wrote:
> There really needs to be some kind of warning in the docs about the
> bitbang driver.  Implementing ieee 488.2 with software driven dio
> lines has no chance of meeting the standard's timing requirements.

indeed - i'll update the documentation and try to gather some numbers
on the (worst case) timings to see where the limits are.

> Which is a relatively minor complaint, considering the bitbang driver
> makes no serious attempt to implement the behavior required by the
> protocol's state machines.

Also true :-/

Thanks for tuning in,
Thomas


> On Mon, Oct 11, 2021, 16:55 marcello carla' <[email protected]> wrote:
> 
> > Maybe I am wrong, but at a first sight it looks like
> > the meter address is not 10. If you are sure the address
> > is correct, try this:
> >
> > sudo su
> > echo 1 > /sys/module/gpib_bitbang/parameters/debug
> > tail -f /var/log/kern.log
> >
> > Then, open another terminal, try again with ibterm,
> > cut the output that comes from tail and send me.
> >
> > Make sure also that "eos = 0x0d" is the correct
> > termination for the instrument. You might try "eos = 0x0a".
> >
> > Good luck
> >
> > Marcello
> >
> >
> >
> > On 10/11/21 8:36 PM, Dirk wrote:  
> > > Hello,
> > >
> > > several weeks ago i obtained a RaspberryPI GPIB Shield.
> > >
> > > I followed the instructions at
> > > http://elektronomikon.org/install.html but did minor changes to
> > > get version 4.3.4 working.
> > >
> > > Installation went fine without any problems.
> > >
> > > If i try to read something from my R&S URV5 power meter nothing
> > > happend. I get the same result with my SMG signal generator.
> > >
> > > Testing the system with "ibtest" (-> line status) shows unkown
> > > status of bus lines.
> > >
> > > At this point i have no idea what is wrong in my setup.
> > >
> > > It would be great if someone can help me.
> > >
> > > BR
> > > Dirk
> > >
> > >
> > >
> > > Following some additional information:
> > >
> > > root@raspberrypi:/home/pi# cat /etc/debian_version
> > > 10.10
> > > root@raspberrypi:/home/pi#
> > >
> > > root@raspberrypi:/home/pi# uname -a
> > > Linux raspberrypi 5.10.60-v7+ #1449 SMP Wed Aug 25 15:00:01 BST
> > > 2021 armv7l GNU/Linux
> > > root@raspberrypi:/home/pi#
> > >
> > > root@raspberrypi:/home/pi# dmesg
> > > [...]
> > > [   55.161921] gpib_common: loading out-of-tree module taints
> > > kernel. [   55.164358] Linux-GPIB 4.3.4 Driver
> > > [   55.182620] gpib: registered gpib_bitbang interface
> > > root@raspberrypi:/home/pi#
> > >
> > >
> > > root@raspberrypi:/home/pi# gpib_config -v
> > > linux-gpib version = 4.3.4
> > > root@raspberrypi:/home/pi#
> > >
> > > root@raspberrypi:/home/pi# ibterm -d10
> > > Attempting to open /dev/gpib0
> > > pad = 10, sad = 0, timeout = 10, send_eoi = 1, eos_mode = 0x0000  
> > > ibterm>*IDN?
> > > ibterm>  
> > > ibterm: Done.
> > > root@raspberrypi:/home/pi#
> > >
> > > root@raspberrypi:/home/pi# ibtest
> > > Do you wish to open a (d)evice or an interface (b)oard?
> > >          (you probably want to open a device): b
> > > enter name of interface board (or device) you wish to open: violet
> > > trying to open board named 'violet'
> > > You can:
> > >          w(a)it for an event
> > > [...]
> > >          send group e(x)ecute trigger (device only)
> > > : l
> > > DAV unknown
> > > NDAC unknown
> > > NRFD unknown
> > > IFC unknown
> > > REN unknown
> > > SRQ unknown
> > > ATN unknown
> > > EOI unknown
> > > gpib status is:
> > > ibsta = 0x1160  < SRQI CMPL REM CIC >
> > > iberr= 0
> > >
> > > ibcntl = 0
> > > You can:
> > >          w(a)it for an event
> > > [...]
> > >          send group e(x)ecute trigger (device only)
> > > :
> > >
> > >
> > > root@raspberrypi:/home/pi# cat /usr/local/etc/gpib.conf
> > > [...]
> > > /* This section configures the configurable driver characteristics
> > >   * for an interface board, such as board address, and interrupt
> > > level.
> > >   * minor = 0 configures /dev/gpib0, minor = 1 configures
> > > /dev/gpib1,  
> > etc.  
> > >   */
> > >
> > > interface {
> > >          minor = 0       /* board index, minor = 0 uses
> > > /dev/gpib0, minor = 1 uses /dev/gpib1, etc. */
> > >          board_type = "gpib_bitbang"     /* type of interface
> > > board being used */
> > >          name = "violet" /* optional name, allows you to get a
> > > board descriptor using ibfind() */
> > >          pad = 0 /* primary address of interface             */
> > >          sad = 0 /* secondary address of interface           */
> > >          timeout = T3s   /* timeout for commands */
> > >
> > >          eos = 0x0d      /* EOS Byte, 0xa is newline and 0xd is
> > > carriage return */
> > >          set-reos = yes  /* Terminate read if EOS */
> > >          set-bin = no    /* Compare EOS 8-bit */
> > >          set-xeos = no   /* Assert EOI whenever EOS byte is sent
> > > */ set-eot = yes   /* Assert EOI with last byte on writes */
> > >
> > > /* settings for boards that lack plug-n-play capability */
> > >          base = 0        /* Base io ADDRESS                  */
> > >          irq  = 0        /* Interrupt request level */
> > >          dma  = 0        /* DMA channel (zero disables)      */
> > >
> > > /* pci_bus and pci_slot can be used to distinguish two pci boards
> > > supported by the same driver */
> > > /*      pci_bus = 0 */
> > > /*      pci_slot = 7 */
> > >
> > >          master = yes    /* interface board is system controller
> > > */ }
> > >
> > > /* Now the device sections define the device characteristics for
> > > each device.
> > >   * These are only used if you want to open the device using
> > > ibfind() (instead
> > >   * of ibdev() )
> > >   */
> > >
> > > device {
> > >          minor = 0
> > >          name = "urv"
> > >          pad = 10
> > >          sad = 0
> > > }
> > >
> > >
> > > device {
> > >          minor = 0       /* minor number for interface board this
> > > device is connected to */
> > >          name = "smg"    /* device mnemonic */
> > >          pad = 28        /* The Primary Address */
> > >          sad = 0 /* Secondary Address */
> > >
> > >          eos = 0xa       /* EOS Byte */
> > >          set-reos = yes /* Terminate read if EOS */
> > >          set-bin = no /* Compare EOS 8-bit */
> > > }
> > >
> > > root@raspberrypi:/home/pi#
> > >
> > >
> > > _______________________________________________
> > > Linux-gpib-general mailing list
> > > [email protected]
> > > https://lists.sourceforge.net/lists/listinfo/linux-gpib-general  
> >
> > --
> > Marcello Carla'
> > ([email protected])
> >
> >
> > _______________________________________________
> > Linux-gpib-general mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/linux-gpib-general
> >