##openfpga on 2019-05-10 — irc logs at freenode.irclog.whitequark.org

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00:40 <TD-Linux> adamgreig, is your spi programmer only 1 sided?

00:42 <adamgreig> what do you mean?

00:43 <adamgreig> the pcb has two layers, components only on one side, and it does bidirectional full duplex spi

00:43 <adamgreig> (by which i mean, it can swap the sense of both miso and mosi)

00:44 <adamgreig> today in "lies datasheets tell", https://twitter.com/adamgreig/status/1126647336501948416

00:44 <TD-Linux> yeah I meant just one side of components

00:44 <TD-Linux> it looks super fast to assemble

00:44 <adamgreig> yea! it was extremely fast

00:44 <adamgreig> and a few more could go if you didn't want to have target power supply

00:45 <adamgreig> the sot-23-5 is a power switch

00:45 <adamgreig> i think i might just build it in to my upcoming fpga board, it's almost the same price for usb+stm32 as for samtec debug connector

00:45 <adamgreig> could add a usb serial port to fpga that way too

00:46 <TD-Linux> indeed. I would consider using tinyfpga bootloader but most of my stuff uses a hx1k

00:46 <TD-Linux> (and that still needs initial programming)

00:46 <adamgreig> yea

00:47 <adamgreig> stm32f042 is nice too in that it comes in big-pitch qfp, or teeny tiny bga/qfn

00:47 <adamgreig> and needs no passives besides a decoupling cap perhaps

00:47 <adamgreig> and it has a built in usb bootloader so you don't even need an stm32 programmer :p

00:48 <gruetzkopf> one of the local connector manufacturers brought me shiny catalogues ealier today

00:48 <TD-Linux> yeah the big-pitch qfp means you can be pretty sloppy during placement

00:50 <adamgreig> shame the usb-c connector is quite fine pitch, even this usb2-only version

00:51 <TD-Linux> I'd be tempted to put microusb on except they are also probably equally unreliable

00:53 <adamgreig> microusb is fine really and relatively easier to solder i guess

00:53 <adamgreig> but usb-c is defo the future and it's very nice getting to plug it in either way around

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01:25 <whitequark> i almost wonder if it's worth using reversible microusb

01:25 <whitequark> https://images-na.ssl-images-amazon.com/images/I/71OU5dR8hKL._SL1500_.jpg

01:25 <whitequark> cable but iirc there are connectors too

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05:29 <kbeckmann> What's the current usability of SERDES on ECP5 (LFE5UM and/or 5G) with trellis? What works and doesn't work?

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05:47 <daveshah> kbeckmann: as far as I know, everything is supported

05:48 <daveshah> However it's not that well tested, and there is very little documentation on the parameters themselves

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05:49 <daveshah> whitequark has done some stuff on this though (see https://github.com/whitequark/Yumewatari/blob/master/yumewatari/gateware/platform/lattice_ecp5.py#L182)

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06:03 <kbeckmann> That's great to hear! Thanks! I will probably have a few questions once I start using it, but this looks like enough information to get me started :)

06:04 <whitequark> you can ask me directly if you want

06:12 <kbeckmann> thanks :)

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13:57 <Sprite_tm> daveshah: Hey, if you're there, quick q: do you know if I still need your yosys branch for https://github.com/daveshah1/prjtrellis-dvi/tree/master ?

13:58 <Sprite_tm> Trying to run the makefile, but yosys is stuck on hdl/vga2dvid.v , using 100% cpu and not doing anything...

13:59 <daveshah> Sprite_tm: the vga2dvi Verilog was broken but this was only revealed with a recent Yosys fix

13:59 <daveshah> I would use master and remove https://github.com/daveshah1/prjtrellis-dvi/blob/master/hdl/vga2dvid.vhd#L100 which is dead code anyway

14:02 <Sprite_tm> Ah, that was... kinda obvious I guess :) thanks.

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15:03 <tnt> Arf, not sure what I was thinking when I coded my wishbone arbiter ... it will switch which master has priority right in the middle of a transaction ... duh ...

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15:17 <Sprite_tm> daveshah: It works great (after I spent a few hours debugging what was a short *under* my HDMI connector...), thanks!

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22:29 <TD-Linux> adamgreig, btw if I order some ffp boards should I do r1? will there be a r2?

22:32 <adamgreig> I don't plan on it but haven't finished the firmware so don't know for sure yet :p

22:33 <TD-Linux> ok I'll hold off a bit :)

22:34 <TD-Linux> I suppose I could use the same cortex tag-connect for the spi flash programming connection on my ice40 boards

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