[Linux-gpib-general] Problems with Electronomikon gpib_bitbang

[<qui...@ic...>]

Hi all,
I’m having trouble getting any results using a electronomikon GPIB hat on a Pi. I have tried two different interface boards, two different Pis (a Pi3 and Pi4), different devices and different cables. I figure the problem is therefore with my driver setup or commands.

I’m running the r2048 branch, locally compiled.

My /usr/local/etc/gpib.conf  config file is -

<code>

interface {
	minor = 0			/* board index, minor = 0 uses /dev/gpib0, minor = 1 uses /dev/gpib1, etc. */
	board_type = "gpib_bitbang"	/* name of the driver */
	name = "raspi_gpio_interface"	/* optional name, allows you to get a board descriptor using ibfind() */
	pad = 0				/* primary address of interface             */
	sad = 0				/* secondary address of interface           */
	eos = 0x0a	/* 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 */
	timeout = T30s
/* 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)      */

	master = yes	/* interface board is system controller */
}


device {
	minor = 0
     name = "SolartronDMM"
     pad = 7
     eos = 0x0a
     set-reos = yes
     set-bin = no
	timeout = T30s
}

</code>

Syslog shows driver loading -
<code>
Feb 21 21:40:22 GPIB01 kernel: [   64.307958] gpib_common: loading out-of-tree module taints kernel.
Feb 21 21:40:22 GPIB01 kernel: [   64.310725] Linux-GPIB 4.3.5 Driver
Feb 21 21:40:22 GPIB01 kernel: [   64.336055] gpib: registered gpib_bitbang interface
Feb 21 21:40:22 GPIB01 kernel: [   64.336083] gpib_bitbang:bb_init_module - module loaded with pin map "elektronomikon" and SN7516x driver support
Feb 21 21:40:36 GPIB01 kernel: [   78.563879] gpib_bitbang:bb_attach - Using pin map "elektronomikon"  with SN7516x driver support
Feb 21 21:40:36 GPIB01 kernel: [   78.564627] gpib_bitbang:bb_attach - attached board: 0
</code>

Using the glib utility -
<code>

sudo modprobe gpib_bitbang sn7516x_used=1

pi@GPIB01:~ $ sudo ibterm -d 7 -e 10 -r 1 -N -i -x

Attempting to open /dev/gpib0
pad = 7, sad = 0, timeout = 10, send_eoi = 0, eos_mode = 0x040a
ibterm>*IDN?
ibterm error: Unable to write to device at pad 7

- ENOL 2: No listeners
ibterm>
InternalReceiveSetup: command failed
ibterm error: Failed during read from device at pad 7

- ENOL 2: No listeners

</code>

Device is currently a solartron 7150 multimeter but have used other miscellaneous HP equipment as well. Device confirms its address is 7 on startup.

I’ve also attempted a basic 

interm -d 7

Both LEDs on the board are illuminated but neither change during commanding.

Any advice as to how to debug? Am I using the correct EOS mode? 

Thanks,
Chris