clifford changed the topic of #yosys to: Yosys Open SYnthesis Suite: http://www.clifford.at/yosys/ -- Channel Logs: https://irclog.whitequark.org/yosys
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<mattvenn_> have people seen this? https://github.com/tinyfpga/TinyFPGA-Bootloader
<tpb> Title: GitHub - tinyfpga/TinyFPGA-Bootloader: An open source USB bootloader for FPGAs (at github.com)
<mattvenn_> cool to see usb serial endpoint on the fpga itself
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<ZipCPU> Yeah, I've seen it, and ... it's on my to do list for my tinyzip project to use it.
<ZipCPU> I've dug into it a couple of times, but ... I'm not ready to say I truly understand it (yet).
<ZipCPU> I managed to get past the physical layer in my understanding, but only just. The next layer had more options to be supported than I was expecting.
<mattvenn_> I think I need to understand how the usb protocol works to establish endpoints.
<ZipCPU> Exactly. I want a USB serial port, in addition to his protocol.
<mattvenn_> Isn't it a serial port already? Thought that was the point of it
<ZipCPU> :D
<ZipCPU> Yes, no, sort of ... I mean, I want more of a traditional serial port capability, sort of like most FTDI chips provide
<ZipCPU> USB on one end, serial on the other.
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<awygle> I have a similar intention, but I know next to nothing about usb, sadly
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<ZipCPU> That's what makes tinyfpga's boot loader all the more valuable.
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<shapr> ZipCPU: weird question, when routing it loaded onto an FPGA does that make physical electrical connections?
<shapr> I've often wanted to find a way to make a reconfigurable antenna, and being able to arbitrarily change the shape of the routing on an FPGA might work?
<ZipCPU> You mean ... when loading a binary file onto an FPGA? Are physical electrical connections made internal to the FPGA?
<ZipCPU> shapr: I've seen that proposed before, but never within an FPGA.
<ZipCPU> But, the bottom line, is that physical connections are made.
<ZipCPU> Not sure to what extent you could get an analog signal out of a digital device, though.
<shapr> oh, good point
<shapr> could I connect the routing wires to an out port on the FPGA?
<shapr> or is that buffered or otherwise not a direct electrical connection?
<awygle> shapr: this is Kind Of A Thing, But Not Really
<ZipCPU> That's buffered.
<shapr> awygle: oh? tell me more?
<awygle> and less so in modern fpgas which mostly use unidirectional buffers
<awygle> i've read three or four research papers about it
<sorear> it's been done before, but it doesn't work the same way on two FPGAs
<awygle> shapr: you'd also certainly be interested in Kymeta if you're not aware of them
* shapr googles
<sorear> fpgas are specced to have reproducable digitial properties, not analog properties
<ZipCPU> If you want to create RF energy from the output pins of an FPGA, that's not very hard. Actually, it's harder not to.
<awygle> they set up a standing wave in what's basically an LCD screen and switch the pixels to create aperture antennas (to first order)
<sorear> I thought this was one of the case studies in _On the Origin of Circuits_ but no
<shapr> that's exactly the kind of thing I've been wondering how to do
<shapr> awygle: what are the titles or authors of those research papers?
<ZipCPU> Gosh, and I just wanted to overload the FM radio's in the house .../
<awygle> trying to find one... they basically all concluded "this is a bad idea"
<awygle> so i didn't really save them
<shapr> My first thought was whether I could use one of the MEMS mirror devices
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<shapr> since they have extremely small mirrors that can each have their angle changed separately
<awygle> that's done for free space optical communication (lasercomm)
<awygle> sometimes
<shapr> the mirrors are not electrically connected, so that won't work
<awygle> oo http://blog.executivebiz.com/2017/09/kymeta-to-develop-ka-band-cubesat-antennas-for-nasa/ i have to call my friend at kymeta, we used to talk about this all the time
<shapr> and MEMS devices are much smaller than most antennas
<tpb> Title: Kymeta to Develop Ka-Band CubeSat Antennas for NASA | ExecutiveBiz (at blog.executivebiz.com)
<shapr> and while the research on fractal antennas showed that microscale features really do make a difference to how well an antenna functions, I still don't know how to make this workable
<awygle> shapr: http://data.satirg.org/wp-content/uploads/2016/05/Inmarsat-IDC16-Hardware10-Kymeta.pdf this is the best kymeta paper i can find, can't find any of the "fpga antenna" ones
<shapr> awygle: thanks!
<shapr> oh, I applied to an FPGA compiler writer engineer job at Google this past weekend
<shapr> no way I'll get it, but some other people here should check it out
<shapr> Google X is doing something *really* interested
<shapr> of course I can't find it now, I'll post a link to it later.
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