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<TD-Linux> tnt, thanks for the quick fix!
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<TD-Linux> (btw what is the framerate supposed to be? it seems a lot slower here than I've seen in some videos)
<TD-Linux> (also the color pinout for the module shipped with icebreaker is different still to the two examples)
<tnt> TD-Linux: The panel refresh rate in the default config should be ~ 120 Hz.
<tnt> But for the 'video from flash' example the same frame is displayed several times.
<TD-Linux> I mean the framerate of the frames stored in spi flash
<tnt> you can use the buttons on the icebreaker to change the play speed.
<TD-Linux> oh hmm is the clock derived from the ftdi chip?
<TD-Linux> (even at the fastest framerate it is very jittery - it does 2 frames quick then pauses)
<tnt> You should pause it and look at it frame by frame. The example nyan animation is really not smooth in the file ...
<tnt> it's just the first thing I found on line ...
<tnt> some frames are repeated, some are not ...
<tnt> but it's the original file, not the fpga display.
<TD-Linux> oh okay
<tnt> And the clock is not derived from the ftdi, it's the same clock, but it's from a MEMS oscillator.
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<TD-Linux> the uniformity of this panel is super good, I'm surprised
<TD-Linux> I've seen a lot of bad displays irl
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<TD-Linux> what's a good source for more?
<tnt> https://www.aliexpress.com/store/933144 This is where I bought mine
<tnt> and AFAICT the one from icebreaker come from there too.
<TD-Linux> ok. I saw a lot of vendors but I would like to get similar ones because these look pretty good
<tnt> Unfortunately even from the same shop it can vary ... the first ones esden got were with a different driver chip for instance.
<TD-Linux> yeah. for a big display guess I have to do the whole order in one shot otherwise they might not match
<esden> You have to specify when you are placing your order which chip type you want. If you want to make sure you get the right type.
<esden> If you want to order a bigger amount of panels contact Lysonled, they can give you a decent price, but order about 30% more panels than you need as some of them will have dead pixels that you will need replaced. :/
<TD-Linux> other than the initialization issue, are the other driver chips just as good?
<esden> And definitely order the full amount of displays that you need, otherwise they might even have the correct chip but not the same mechanical mounting pracket.
<esden> *bracket
<tnt> esden: dead leds :/ that sucks to have to test them one by one ...
<esden> yeah ... still waiting for them to get back to me how they want to replace them...
<esden> fortunately the paneltest design by kbob works very nicely to illuminate each color one by one and see if there are any broken leds.
<esden> and we humans can catch a one off pretty well... :)
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<cpresser_> A/win 16
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<whitequark> daveshah: so, there's this device: https://www.bugblat.com/products/bx8/index.html#
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<whitequark> it's MachXO2 based and advertises 1 GHz sample rate.
<whitequark> but MachXO2 doesn't go that high.
<whitequark> what gives?
<daveshah> I've run MachXO2 LVDS inputs fairly close to 1GHz before (at least 800MHz iirc)
<daveshah> It has 4:1 and 8:1 deserialisation
<daveshah> I suspect they're just pushing it a bit
<whitequark> the sysIO buffers top out at 400 MHz
<whitequark> or are those numbers just for output
<daveshah> But I think you can double that with DDR
<whitequark> hmm
<daveshah> that's the maximum "full toggle rate"
<whitequark> right, it's more of a 1 Gsps logic analyzer
<daveshah> max DDR input rate is 756Mbps with 1:8 deser
<daveshah> see page see "DDRX4 Serial Input Data Speed"
<daveshah> *see page 61
<whitequark> oh I see, SCLK limited?
<daveshah> ECLK limited I believe
<whitequark> hm, ok
<daveshah> Max SCLK is 388MHz and max ECLK is 400MHz afaics actually
<daveshah> so not sure where the limit is (400MHz ECLK -> 800Mbps in theory)
<whitequark> yeah, that's what i thought is weird
<daveshah> MachXO3 datasheet has 800Mbps max which makes much more sense
<daveshah> normally these things are ECLK limited (ECP5 is at least)
* whitequark stares at page
<whitequark> I just realized that L in LM32 is Lattice
<whitequark> I mean I knew it's LatticeMico32, I never realized it's the ... same Lattice
<daveshah> I think it might be a typo, 756Mbps is really just the limit for 1:7 IO and 1:8 can do the full 800Mbps
<whitequark> ah
<anuejn_> p
<gruetzkopf> LM32!
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