I have a Stab Rotor Sat HH90 dish positioner that uses the DiSEqC 1.2 protcol. My receiver card is a
Kworld DVB-S 100 with the cx24123 demodulator. Is it possible to send DiSEqC commands to position
the dish with V4l/DVB as it now stands? Or will support for DiSEqC dish positioning be written soon?
In checking the web, I have not found any references to dish positioning with a cx24123, or any
references to dish positioning in the apps I have installed (mplayer, kaffeine, xawtv).
I am running Slackware 10.2 with Kernel 2.6.17-rc1 and Yeasah Pell's latest cx24123.patch applied.
Thanks, Garnet
Yeasah Pell wrote:
I took a closer look at this, and I believe I have found the problem.
The cx24123_send_diseqc_msg() function did not wait for the busy bit to
be cleared before sending the message, only after. That behavior makes
some intiutive sense, since the driver is the only one that should ever
be sending messages through the card, but experiments show that
nevertheless the diseqc queue is sometimes marked as busy at the time
the diseqc command is sent, and previously the driver would just blast
the message through anyway, and it would presumably be lost. Some other
condition must cause the queue to become busy -- it looks like changing
the LNB voltage or tone status might do this. This is certainly why
adding extra delay made my positioner more reliable -- I assume it also
applied to switches, but I must have not noticed for some reason.
I've revised the patch to have the driver wait for the busy bit both
before and after sending a disqec message.
Yeasah Pell wrote:
From what I've seen, some DiSEqC switches can be *really* picky, and
I've seen lots of reports of switches working fine on one card but not
working at all on another (or working unreliably) I can't offer any
more detail or explanation than that though -- just my observation of
reports online.
My understanding is that the main difference between DiSEqC 1.x and
2.0 is that 2.0 is bidirectional, which this card does seem to
support, but this driver doesn't. But that should just mean you won't
get status back from the devices -- the control aspect ought to still
work fine. You wouldn't get status back unless the disqec commands
were set to request it anyway, which the software you are using
probably isn't doing.
I can confirm that on my DVB-S 100, with either my patch or vadim's
original diseqc patch, I am able to control a 4 port generic diseqc
switch which claims to be "1.0/2.0" compliant, as well as a dish
positioner.
One thing you might try is enabling debug messages in the cx24123
module (i.e. by putting a line saying "options cx24123 debug=1" in
/etc/modprobe.conf and reloading the modules or rebooting), that way
you should see confirmation messages in dmesg of the diseqc messages
being sent. That will at least confirm that 1) you are definitely
loading the patched driver and 2) diseqc commands are in fact being
issued to the card. You should see some lines including the text
"cx24123_send_diseqc_msg", and hopefully no error indications.
The only other thing I would note is that in order to get my
positioner to accept disqec commands reliably I had to increase the
delay between the tone shutoff/voltage change and the diseqc command
being sent in the software I use. I didn't have that problem with the
switch, but I certainly would put that sort of timing issue high up on
the list of suspected causes -- this card might take longer than
normal for its LNB voltage to stabilize, or to actually stop sending
the tone.
The popular timing seems to be to wait 15 msec, I upped that to 100
msec to get it to work with my positioner. It probably doesn't need
that much of an increase, that's just what I tried first, and it
doesn't really add a significant amount of time to the total command
sequence from a user perspective. I was using other software, but if
you want to try the change in dvbscan, change the first msleep(15) in
the diseqc_send_msg function in diseqc.c to msleep(100), and recompile
-- in fact you could try lengthening all the delays in that function,
it certainly can't hurt to wait longer on any of those steps (apart
from making the command sequence take longer)
If you find that adding delays helps, please let us know, as it means
we should probably put some delays into the driver ioctls.
Todd wrote:
I applied the your attached "cx24123.patch" to the 2.6.16.1 Kernel
(it "took" just fine). I still can't get the DiSEqC functionality
to work. I am using dvbscan from here:
http://www.phobos.ca/dvb/
...on some DishPro switches (supposedly DiSEqC 2.0 switches). It
works fine with my "Sky2PC/SkyStar 2 DVB-S" card, but not this kworld
card. (Same tools, same commands; literally cut and pasted between
SSH windows...even switch cabling into switch)
Is this patch dated?...is there a new one? Does the kworld card
support DiSEqC 2.0? (the marketing hype claims 2.x compatibility:
http://www.kworld.com.tw/en/product/dvb-s/001/dvb-s100.htm )
Thanks in advance,
Todd
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