<whitequark>
wow, this is a massive amount of scrollback
<DaKnig>
sorry... I had quite a lot of trouble getting everything to work.
<whitequark>
no problem at all
<whitequark>
i'm just internally debating whether i should stop reading it all heh
<DaKnig>
miek: I saw a similar example before, but what I dont understand is this: it calls `.request("led")` but in my platform file I cant find the string "led" anywhere
<DaKnig>
is that something internal to the `LEDResrources` class?
<DaKnig>
how can I specify which LED specifically I want to be used for this?
<whitequark>
yes, it's interrnal to LEDResources (which is just a function)
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<DaKnig>
how can I tell it which LED I want it to choose?
<DaKnig>
can I do someting like "led[3]"?
<miek>
.request("led", 3)
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<Yehowshua>
Does anyone know how to use DomainRenamer()?
<Yehowshua>
What's really been helpful is learning by example
<Yehowshua>
soft documentation I guess its called
<whitequark>
yeah, examples definitely are necessary and will be the primary way people learn
<whitequark>
i mean, we're going to have a proper tutorial
<whitequark>
and some cheatsheet pages
<Yehowshua>
From a sophomore student's perspective, that is good.
<Yehowshua>
At my school, Python is now required instead of Matlab, I think it nMigen should be fairly accesible
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<d1b2>
<emeb> As a long-time Matlab user I think this is a good thing.
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<d1b2>
<TiltMeSenpai> so Kate's LUNA platform uses d_p/d_m for usb data lines, but it looks like the nmigen-boards platforms use d_p/d_n for the data lines. Would it be appropriate to make a PR to one of the projects so nmigen-boards platforms could work nicer with LUNA's gateware and/or where would that belong?
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<Yehowshua>
d1b2, do you have some code already? nMigen boards for TinyFPGABX at least has usb_p and usb_n
<Yehowshua>
I have a working example of UART on USB with nMigen too
<d1b2>
<TiltMeSenpai> oh does the irc show the user as d1b2
<Yehowshua>
You nick is db12, your name is TiltMeSenpai...
<Yehowshua>
No. actually is says `1BitSquared Discord Bridge`
<d1b2>
<TiltMeSenpai> ah, I'm on the Discord side of the bridge, my name here is TiltMeSenpai. Anyways, I'm messing around with the Orangecrab, I managed to get the usb serial example from LUNA working on it but it involved changing more things than I'd prefer
<Yehowshua>
d1b2, that's fantastic
<Yehowshua>
I just lookedd up orangecrab
<Yehowshua>
Wow - didn't even know about it - I wish there was an official ECP5 list
<Yehowshua>
Is the orange crab in production?
<d1b2>
<TiltMeSenpai> yeah you can either buy them from 1bitsquared's store or the groupgets store
<Yehowshua>
d1b2, also, you mentioned free node nMigen has a Discord bridge?
<d1b2>
<TiltMeSenpai> yeah, I'm on the 1bitsquared Discord server, there's a bot that syncs messages from the nmigen channel here to the nmigen freenode channel
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* awygle
declares scrollback bankruptcy
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<lkcl>
awygle: lol. likewise. i had to use the irc logs yesterday. hexchat's scrollback buffer wasn't long enough
<lkcl>
DaKnig: i encountered the exact same type of thing when installing vivado a couple of years ago. as i "know vaguely what i am doing" from 20 years messing with GNU/Linux OSes, i "solved" the problem of things like libfdti1.so having different names by creating symlinks in /usr/lib.
<Yehowshua>
What tool is that from? That doesn't look like an nMigen issue...
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<DaKnig>
vivado doesnt like the primitives nmigen uses for something
<Lofty>
It shouldn't be difficult to fix
<FL4SHK>
is there any way I can output 156 MHz signals to a DAC for VGA output?
<FL4SHK>
156 MHz was what I needed for 1080p
<Lofty>
FL4SHK: are you trying to drive VGA and HDMI with the same clock?
<FL4SHK>
no, just VGA
<Lofty>
156MHz pixel clock is really high
<Lofty>
Hmmm
<FL4SHK>
yes, but it's what I need for 1080p VGA
<Lofty>
Anyway, why can't you output 156MHz signals?
<FL4SHK>
I'm concerned about signal integrity
<Lofty>
...How so?
<FL4SHK>
because 156 MHz signals have all these high frequencies
<Lofty>
That's mostly for the PCB
<Lofty>
From an FPGA point of view, sure, you can output 156MHz signals
<FL4SHK>
the signal is exiting the FPGA
<FL4SHK>
so it needs to deal with signal integrity
<Lofty>
That's on your PCB
<FL4SHK>
my concern is that the thing won't work even if the FPGA code is completely verified as working
<daveshah>
VGA at worst will be a bit blurry if the SI is wrong
<Lofty>
Then maybe have a chat with awygle or somebody who knows how to do high-frequency PCB work
<FL4SHK>
I see
<daveshah>
In theory, terrible quality on the hsync/vsync could cause the monitor not to sync, but I've done some pretty ropey things and it's run fine even at 1080p
<daveshah>
the other thing to do is start at 640x480 (~25MHz pixel clock), which also makes timing closure easier
<daveshah>
and then try intermediate resolutions and look to see if there is any degradation going up
<FL4SHK>
Well, I've got 25 MHz signals generated just fine
<FL4SHK>
one of my projects is going to just output a 640 by 480 resolution
<FL4SHK>
another will be using the 1080p resolution
<FL4SHK>
I should probably just focus on one project
<FL4SHK>
the two things will be using two different dev boards anyway
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<d1b2>
<נמר הגוקו> What are the boolean AND, OR equivalents that I can use for If blocks at migen? can I use the python 'and', 'or'?
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<Yehowshua>
I believe you have to use ampersand
<Yehowshua>
and pip
<Yehowshua>
**pipe
<Yehowshua>
In general, you can experiment with the nMigen language live in the REPL
<Yehowshua>
Just re-read your question. Inside `m.If():`, you can do `m.If(a &b):` where `a` and `b` are both signals
<Yehowshua>
`m.If(a & b):`
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<DaKnig>
156MHz is not that high for some digital things
<awygle>
156 MHz isn't too fast. Easy to make work with minimal precautions
<FL4SHK>
I see
<DaKnig>
FL4SHK dont be concerned about the frequencies. my board is ok with outputting 400MHz digital signal
<FL4SHK>
DaKnig: here's a thing you can do: translate the nMigen code into Verilog, then use Verilog tools
<FL4SHK>
I see
<FL4SHK>
I'll have to give it a shot, then
<DaKnig>
if you are working with VHDL or Verilog you just use the right buffer primitive and it just works. dont worry about signal integrity, it was the manufacturer's job.
<DaKnig>
one thing to keep in mind though is the cable
<DaKnig>
long cable or just cheap cable might ruin the signal
<FL4SHK>
I don't use primitives
<FL4SHK>
it's not portable
<DaKnig>
with analog you would just get worse picture quality which is not a big deal
<DaKnig>
with digital, like HDMI, it might lose pixels and just stop working
<DaKnig>
VGA doesnt really need much care on your side- worst case you get a blurry pic, but that's not that bad... its ok as long as the control signals are ok
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<daknig2>
is there any reference for using hdmi stuff with nMigen? or at least for how to use differential pairs? I have an onboard hdmi port which is defined as a few tmds ports (and other stuff) in the platform file, and I need to use them
<awygle>
Define the pins with DiffPairs
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<_whitenotifier-b>
[nmigen-boards] DaKnig opened issue #84: wrong type of buffer primitive used in series 7 - https://git.io/JJnXP