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#apertus IRC Channel Logs

2020/07/30

Timezone: UTC


04:29
intracube
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04:31
intracube
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05:07
BAndiT1983|away
changed nick to: BAndiT1983
07:26
mumptai
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07:59
Bertl_zZ
changed nick to: Bertl
07:59
Bertl
morning folks!
08:13
kbeckmann
good morning!
08:14
kbeckmann
i think i will do a test today where i connect a logic analyzer to the control pins on the ft600 to visualize exactly how bad USB 3 + ftdi drivers are essentially.
08:15
Bertl
sounds like a plan!
08:18
se6ast1an
good day
09:55
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10:25
Bertl
off for now ... bbl
10:25
Bertl
changed nick to: Bertl_oO
10:48
Dest123
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intracube
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14:04
BAndiT1983
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BAndiT1983|away
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16:02
Bertl_oO
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intracube
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16:45
BAndiT1983
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17:47
Oscar
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18:02
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18:05
AndroUser
Test
18:05
AndroUser
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18:05
RexOrCine_OnTour
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18:05
RexOrCine_OnTour
Tesr
18:06
RexOrCine_OnTour
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19:26
anuejn
kbeckmann: any results?
19:27
anuejn
(I am quite interested in seeing why the test results from bertl were so disappointing)
19:44
se6ast1an
wiki: codeformating has been updated
19:44
se6ast1an
https://wiki.apertus.org/index.php/Sandbox#Code_Formatting
19:44
kbeckmann
i did some testing today and honestly it looked pretty good
19:44
se6ast1an
use:
19:44
se6ast1an
<pre class="code">
19:44
se6ast1an
</pre>
19:44
se6ast1an
the space before the first <pre... is important
19:44
se6ast1an
kbeckmann: nice!
19:45
se6ast1an
can you share?
19:46
kbeckmann
sorry for the format, but i recorded a stream that i did a few hours ago. let me see if i can find the interesting timestamps. but MB/s-wise, i get 190 MB/s out of 200 which is the theoretical max.
19:47
kbeckmann
https://www.twitch.tv/videos/695349295 the interesting stuff starts at around 27 minutes
19:47
se6ast1an
that indeed sounds very promising!
19:47
kbeckmann
i attached a logic analyzer to the state machine and plotted the transitions
19:48
BAndiT1983|away
changed nick to: BAndiT1983
19:49
Bertl
kbeckmann: what logic analyzer is that?
19:50
Bertl
I recognize the GUI (Saleae) but the dvice looks like one of the chinese logic analyzers
19:50
Bertl
*device
19:51
kbeckmann
yep it's one of those cheap clones. sampling at 12MS/s
19:51
Bertl
okay, so you are running at less than 6MHz there?
19:52
kbeckmann
what i was looking for was significant delays, that we should see even with that
19:52
Bertl
well, we were 'good' up to about half the theoretical bandwidth limit
19:53
Bertl
so I wouldn't expect anything unusual at 6/10MHz :)
19:53
kbeckmann
mm.. but i was expecting to see a few us of delay actually
19:53
kbeckmann
but that didn't show up at all
19:57
Bertl
I suspect the issue we were seeing resulted from the driver not being able to handle the data properly
19:58
Bertl
i.e. not the FT60x side, but the receiver side
20:04
kbeckmann
i see. maybe you could test writing a loopback or constant source gateware and test it with the example code that just consumes data?
20:05
Bertl
yes, we have a generator HDL which does simply feed PRNG data all the time
20:06
Bertl
I'm currently swamped with unrelated stuff, but it should be better next week, if you like we can get a test setup you can access remotely or so?
20:06
kbeckmann
ah i see
20:06
kbeckmann
oh yeah sure, that sounds cool
20:07
Bertl
great! I'll keep you updated on the progress then
20:07
kbeckmann
sounds good :)
20:09
Bertl
btw, nice 'live stream'
20:09
Bertl
do you do that on a regular basis?
20:10
kbeckmann
thanks, it was my first so i probably just rambled :p
20:10
kbeckmann
i am thinking of doing that but not sure if people are interested
20:11
kbeckmann
i'll try to have a better focus next time and announce it earlier. this was basically just a test
20:11
Bertl
not bad for a first/test run
20:11
kbeckmann
thx
20:12
Bertl
I've seen a lot worse from established live streamers :)
20:12
kbeckmann
hehe
20:12
kbeckmann
i am not used to talk and think at the same time. always messed up when whiteboarding etc :p
20:12
Bertl
you'll get used to it ...
21:40
RexOrCine_OnTour
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21:52
BAndiT1983
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22:00
Bertl
off to bed now ... have a good one everyone!
22:00
Bertl
changed nick to: Bertl_zZ