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#apertus IRC Channel Logs

2017/12/29

Timezone: UTC


00:03
anuejn
but there is no /sys/device/axi only /sys/device/amba
00:08
anuejn
any ideas?
00:37
Bertl_oO
how did you load it?
00:37
Bertl_oO
and what happens to the 'bit' (wherever you found it) when you load it (i.e. is it 0 before, then 1?)
00:40
felix_
someone working at arri was at the assembly and we talked a bit about cameras and sdi infrastructure and features that would be useful to have that are not difficult to implement, but not present on most affordable hardware
00:41
felix_
was quite interesting
00:41
Bertl_oO
make sure to share it!
00:43
felix_
when we build a pcie sdi card, we really should export information like number of crc errors to the userland. also providing an interface to the signal eye scanning unit of the sdi chips would also be really good
00:44
felix_
generally making every bit of debug information that is already present in the design will be helpful (that was also my impression when trying to get the decklink card working)
00:45
felix_
genlock would also be a feature that is really nice to have, but not that trivial to implement
00:45
Bertl_oO
genlock on the Beta is rather trivial
00:45
felix_
the 2 output and 1 input configuration is also a good idea
00:45
felix_
genlock on the sdi side is probably not easy
00:46
Bertl_oO
what's the issue there?
00:46
felix_
the timing is fixed and very likely you have to compensate the slightly different frequencies of the crystal oscillators
00:47
felix_
you probably can't just drop or duplicate a line in the blanking area without possibly causing problems with other equipment
00:48
Bertl_oO
can you elaborate on the scenario (inputs, outputs, sync) you are talking about?
00:49
felix_
when you have a reference sdi signal that is fed into the camera you probably have to slightly tune the local oscillator to that frequency
00:49
felix_
iirc the decklink cards use a vxco for that
00:50
felix_
*vcxo
00:52
felix_
packet-based signal transmission is so much better and easier to implement *sigh* ;)
00:52
felix_
well, at least the synchronization
00:57
Bertl_oO
why not feed the SDI clock input to a PLL and use that for the output?
01:00
Bertl_oO
or alternatively adjust the phase on the TX side if you don't want to regenerate the clock signal (for whatever reason)
01:08
anuejn
Bertl_oO:
01:09
anuejn
cat /opt/bitstreams/soc_main.bit >/dev/xdevcfg
01:09
anuejn
where soc_main.bit is the bitstream from the link above
01:10
felix_
Bertl_oO: probably jitter will be a problem with that solution
01:10
felix_
will be afk for a while
01:13
anuejn
Bertl: the bit changes from 0 to 1, when i load the bitstream
01:18
anuejn
will be afk for some while, too
01:18
anuejn
lets continue debugging after sleeping, Bertl
01:22
Bertl_oO
does the hang happen when you access 0x60100000 as well?
01:53
xfxf
left the channel
01:54
xfxf
joined the channel
03:29
davidak[m]
there where some people who came to the assembly today and we explained the project and answered questrions
03:29
Bertl_oO
excellent! good work!
03:30
davidak[m]
the feedback was very positive. everyone liked the idea of an open hardware video camera
03:30
Bertl_oO
yeah, the feedback is always quite positive ...
03:42
davidak[m]
note for next year: start earlier with preparation
03:42
davidak[m]
and have some concept for the assembly
03:43
Bertl_oO
doesn't work if nobody is there who sticks to the plan :/
03:43
davidak[m]
now it's kind of a table with some trash on it :D
03:43
davidak[m]
and both SDI and HDMI is still not working
03:43
Bertl_oO
make sure that the trash gets home safely :)
03:43
davidak[m]
sure
03:44
davidak[m]
i'm confident we get SDI working tomorrow when florent is there
03:44
Bertl_oO
hopefully
03:45
davidak[m]
and when HDMI works, i want to go around and capture some impressions and take pictures
03:45
Bertl_oO
HDMI requires a 'known working' HDMI plugin (which you probably don't have) and a different Beta firmware
03:46
davidak[m]
do you have a working image? we are still working to automate the build process
03:47
davidak[m]
i have an additional microSD card for an HDMI image
03:47
davidak[m]
is the chance high that a random, untested HDMI module don't work?
03:47
davidak[m]
they look quiet simple
03:53
Bertl_oO
see private message
03:53
jucar
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04:05
seku
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04:27
jucar
left the channel
05:51
aombk3
left the channel
06:27
jucar
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06:38
jucar
left the channel
07:08
Bertl_oO
changed nick to: Bertl_zZ
07:22
davidak[m]
It could get a little late until i show up. so don't wait for me
08:06
rton
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08:11
Kjetil
felix_: yes. feeding the recovered TX clock from a transceiver will likely be way to jittery unless an external jitter cleaner is used
08:21
seku_
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08:32
RexOrCine
davidak: "capture some impressions and take pictures" - Good stuff. From what I've seen the venue is impressive.
09:23
seku_
left the channel
09:25
seku_
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11:25
BAndiT1983|away
changed nick to: BAndiT1983
12:35
LordVan
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12:52
aombk
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14:11
_florent_
davidak[m]: can you ping me on this channel when you'll want help with the setup?
14:12
Bertl_zZ
changed nick to: Bertl_oO
14:19
davidak[m]
florent: i need an hour or so to be at congress again. you can meet with felix and get the SDI output working. ask the VOC if you can connect the beta to the encoder cube
14:24
_florent_
ok i'll try to be at the apertus assembly one hour
14:42
LordVan
left the channel
15:00
seku_
left the channel
15:33
BAndiT1983
changed nick to: BAndiT1983|away
16:14
jucar
joined the channel
16:36
se6astian|away
changed nick to: se6astian
16:36
davidak[m]
now i'm at the assembly
16:37
seku_
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16:39
_florent_
ok i'm coming
16:47
aombk2
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16:51
aombk
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17:01
seku_
left the channel
17:03
seku_
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17:20
_florent_
we got the first axiom working
17:20
_florent_
(with sdi)
17:24
RexOrCine
Is there something in particular that the cam will be filming?
17:26
seku_
left the channel
17:28
seku_
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17:32
se6astian
I am back in Vienna
17:32
se6astian
davidak[m]: please take some pictures of the stuff going on at 34C3
17:51
seku_
left the channel
18:31
seku
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18:48
felix_
one camera is working now and the second one is sort of working, but the image is flickering a bit; might be some problem with the sensor or its power supply
18:48
felix_
the sdi module B has some problems and we replaced it with module C
18:49
felix_
module B only works when it gets bent a bit
18:51
RexOrCine
ping se6astian / Bertl_oO
18:58
se6astian
here
18:58
se6astian
thanks for the update felix
19:23
jucar
left the channel
22:02
aombk3
joined the channel
22:04
aombk2
left the channel
22:29
se6astian
off to bed
22:29
se6astian
good night
22:29
se6astian
changed nick to: se6astian|away
22:35
davidak[m]
hey se6astian
22:36
RexOrCine
Here.
22:36
davidak[m]
i have one photo of the 2 betas and the VOC mixing setup
22:36
RexOrCine
Are the day's activities over davdiak?
22:36
RexOrCine
Great
22:37
RexOrCine
if you email them to team @ I'll do a bit of post on them if it's needed ?
22:37
davidak[m]
i just had a video mixer shift and got back to the apertus assembly
22:38
RexOrCine
Did you watch the satnogs talk?
22:39
RexOrCine
Think they're deliberating over when would be a good time to invest in a DK so I dunno if they'll vist the assembly or not.
22:39
RexOrCine
pierros is there.
22:40
davidak[m]
i didn't watch any talk except the opening
22:40
davidak[m]
will do that the weeks after the event
22:40
RexOrCine
Ah. Well the videos are going up.
22:41
davidak[m]
i also saw a preview of the film "all creatures welcome"
22:41
davidak[m]
it was better than i expected and i already had high expectations
22:43
RexOrCine
Reading about it now. Do we not get a mention in it?
22:45
davidak[m]
no, it's about the culture at chaos events
22:46
davidak[m]
so throw your money at the project so we get the film to creative commons license!
22:46
davidak[m]
http://sandratrostel.de/projects/allcreatureswelcome/
22:46
davidak[m]
and inspire future generations of hackers