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#apertus IRC Channel Logs

2013/07/05

Timezone: UTC


01:47
jucar
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jucar1
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07:34
s3bastian
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07:41
dmj_nova
hi s3bastian
07:52
s3bastian
good morning ;)
08:43
Bertl
morning everyone!
09:00
s3bastian
hello! why up so early? :)
09:20
Bertl
don't ask! :)
09:33
Bertl
dmj_nova: back with the zedboard yet?
09:37
Bertl
s3bastian: btw, during testing the axi stuff, I had massive problems with the debug interface losing connection to the DAP, which seems to be 'expected' when the arm cpu hangs (for whatever reason)
09:39
Bertl
so I was thinking, maybe we should have some 'poor men's debug interface' (i.e. basically a bunch of LEDs attached to one or more of the PMOD ports) to help in such situations?
09:43
s3bastian
can you utilize the led array that is already on the zedboard?
09:43
Bertl
yes, of course, but those are just 8 leds
09:44
Bertl
i.e. even at optimal configuration only 256 states
09:44
Bertl
I thought more about multiplexing 64 leds per PMOD port or so
09:47
Bertl
or maybe even some kind of PC/usb interface, but for my purpose, I guess some leds would do
09:50
Bertl
okay, off for now ... bbl
10:01
dmj_nova
s3bastian: so are you suggesting the parallella as an additional board?
10:06
dmj_nova
or are you specifically looking to add that epiphany coprocessor?
10:07
s3bastian
tbh I don't know if it can be of any use for us, but maybe someone can think of a way
10:07
s3bastian
Bertl, could the Zedboards Oled display be of any help fo debugging?
10:10
dmj_nova
s3bastian: The epiphany coprocessor could be interesting
10:11
dmj_nova
though the board itself is likely unable to interface quick enough to be a mainboard for us
10:13
dmj_nova
s3bastian: I don't think we could actually get our raw data onto the board in realtime
10:22
s3bastian
yes, the lack of GPIO is also one of my concerns
10:36
dmj_nova
we can't really use the board as-is to process video in real-time
10:37
dmj_nova
since ethernet is the fastest connection to the board
10:37
dmj_nova
and that's 125MB/s
10:37
dmj_nova
...and we're likely to need ~180MB/s *average*
10:38
dmj_nova
that said, the Epiphany IV chip might be useful
10:38
dmj_nova
but I'm not sure
10:40
s3bastian
do you know more about the epiphany chip?
10:40
s3bastian
what exactly is it?
10:41
s3bastian
btw I had to leve when we were in the middle of discussion hasing methods
10:42
s3bastian
would it be a viable solution to hash the histogram to check image integrity instead of the entire image?
12:10
Bertl
ad oled display: I thought about that, but it requires complicate SPI transfers, so not suitable for this purpose
12:11
Bertl
ad hashing: I think we should definitely consider adding a crc check to the raw data, which in turn could be used for hashing (we already discussed that) but that doesn't help with the existing software framework which assumes full file skein hash and nothing else
12:13
Bertl
ad debugging: I will come up with a simple solution, probably some kind of primitive PMOD board
12:14
Bertl
dmj_nova: what about hdmi? we have at least 16bit at up to 200MHz IIRC
12:21
Bertl
have to leave again, will be back in roughly two hours ...
13:14
s3bastian
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14:14
Bertl
back now ...
16:07
Bertl
http://www.digilentinc.com/Data/Products/FMC-CE/FMC-CE%20Card%20User%20Guide.pdf
16:09
Bertl
(interesting because of the complete FMC LPC and HPC pinout :)
18:15
s3bastian
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18:40
dmj_nova
s3bastian: it's a highly parallel coprocessor
18:42
Bertl
hey, how's going?
18:43
Bertl
http://www.adapteva.com/support/docs/e3-reference-manual/
18:43
dmj_nova
Bertl: still visiting parents, going to a friend's grandma's funeral as well
18:43
Bertl
(for the epiphany)
18:43
Bertl
dmj_nova: oww, full program!
19:00
s3bastian
I see
19:01
s3bastian
but would it be of any use for us compared to custom logic blocks in the FPGA which are also as parallelized as we need them to be?
19:02
Bertl
maybe, depends on what we want to do on the hardware
19:02
Bertl
AFAICT, the main functions identified so far are (regarding AXIOM):
19:03
Bertl
- high speed raw data acquisition from CMV12k
19:03
Bertl
- various sensor data post processing
19:04
Bertl
- HDMI/DVI output with overlay
19:04
Bertl
- high speed data transport to recorder or
19:04
Bertl
- high speed data recording directly to media
19:05
Bertl
we also want to be able to configure all the sensor parameters, so probably we need some kind of GUI as well
19:05
Bertl
i.e. touch screen input or similar
19:06
Bertl
(please correct me or extend/explain where necessary)
19:11
Bertl
on a different note: the FMC on the zedboard doesn't make me happy ... looking at the adapter schematics, I see that we are a few GPIO pins short and we have clock data on non clock lanes and there is one specifically ugly use of a reference voltage pin for exposure_time1
19:11
Bertl
(while exposure_time2 is completely moved to the PMOD)
19:15
Bertl
I'd propose to move all the 3.3V control blocks to PMOD, which would include the CLK_IN, SYS_RES_N, FRAME_REQ and the two exposure timer
19:16
Bertl
and 'just' have all the LVDS data on the LPC-FMC
19:26
s3bastian
sounds good
19:27
s3bastian
yes those main functions are what I would list as well
19:31
Bertl
okay good, I'll take a nap now if there isn't anything else :)
19:41
s3bastian
please enjoy your nap :)
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