Friday, 2019-06-28

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CarlFKmithro: [WARNING] Deprecated, please update SoCCore's "cpu-type" to "mor1kx"02:19
CarlFKmithro: should I update
tpbTitle: HowTo LCA2018 FPGA Miniconf · timvideos/litex-buildenv Wiki · GitHub (at
CarlFKexport CPU=or1k PLATFORM=arty TARGET=net02:19
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CarlFKhow do I redit?    I want to promote the hackfest there14:51
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CarlFKrohitksingh: more serial port fun:14:55
CarlFKdoesn't work: printf "\rrelay $state $num\r" | cstream -b 1 -t 50 | tee /dev/ttyrelay14:55
CarlFKtio /dev/ttyrelay14:55
CarlFKthen do nothing but disconnect.14:55
CarlFKprintf "\rrelay ... now it works.14:56
CarlFKwe need someone who is into debugging usb stack problems.    /me looks at xobs :p14:57
rohitksinghCarlFK: looks like either the firmware is kind-of fragile, or some weird system issue. Don't think it could be USB stack problem, but who knows it could even be that.14:59
CarlFKwelp.. now that isin't working either15:01
CarlFKtio /dev/ttyrelay  ... >relay read 2 ... off [tio 14:52:26] Disconnected.   (so that works.)15:02
CarlFKprintf... relay on 2 - nothing.15:02
xobsLooks like uninitialized values. Or stack smashing.15:04
CarlFKoh hey, more fun: "relay read 2" copy that to clipboard.  tio /dev/ttyrelay, paste.  tio shows me "relyrd"  (missing chars) but when I hit enter I get "on"15:06
CarlFKso all the chars made it into the ... um.. thing.  but echo back failed.15:06
CarlFKI am thinking 'need to throttle" is false15:07
xobsLooks like you're buffering single characters, and you're not draining the buffer fast enough.15:08
CarlFKok this works: printf '\rrelay on 1\r' > /dev/ttyrelay15:08
CarlFKxobs: do you know about the hdmi2usb serial port... issue that I can't find now...15:14
CarlFKmithro: where did you move my bug report to?!!!15:14
xobsCarlFK ( I do not.15:15
CarlFKfound it!!  "This issue was moved to timvideos/HDMI2USB-fx2-firmware#13"15:16
tpbTitle: serial port drops characters · Issue #219 · timvideos/HDMI2USB-litex-firmware · GitHub (at
CarlFKxobs: im hoping your usb skills can tell us something15:18
CarlFKor just fix it :p15:18
CarlFKrohitksingh:  ignore everything I said about the relay board needing to be throttled.15:23
CarlFKit needs something, but throttled isn't it.15:23
CarlFKnow I am hoping the hdmi2usb is the same15:24
CarlFKomg I think so.15:25
xobsDoes it have a real USB connection? Or just a USB translator chip? If its just a chip, then there's not much you can do.15:28
CarlFKbeats me15:30
CarlFKI am wishing it could go beep right now so that I can send it commands and not need an hdmi display hooked up15:31
CarlFKoh hey - NeTV2 - is the hdmi out do both DVI and HDMI?15:31
mithroCarlFK: I believe it currently does some form of HDMI16:01
CarlFKmithro: thanks - that bumps it up on my todo list: figure out how to make it do anything, and then see if it works with my BM card (which may be relevant to Ryans venue equipment problems)16:04
mithroAt some point we need to merge the NeTV2 changes into the HDMI2USB repository16:05
CarlFKmithro: do you post to redit?  if so, can you post about the hackfest?  then Chriss G will plug it in Amp Hour16:07
CarlFKmight get us a signup ;)16:07
CarlFKwoot!  We have 3 already!!16:09
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CarlFKmithro: lol @ I dream in Verilog17:36
CarlFKsounds like a nightmare17:36
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mithroCarlFK: I merged that pull request for you18:51
CarlFKoh right. thanks18:51
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CarlFKwoot!  one of my crew is going to enjoy fpga hacking!!!21:55

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