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| CarlFK | mithro: do you know if bunny is coming to LCA? and / or hackfest? | 05:45 |
|---|---|---|
| xobs | CarlFK: bunnie's not going to LCA this year. | 05:46 |
| CarlFK | xobs: aww. | 05:47 |
| CarlFK | xobs: someone here might come that wants to mess with pcb layout of something like Pink Zybo board to take off most of the stuff and make a little camera thingy | 05:49 |
| CarlFK | you or anyone want to play with that ? | 05:50 |
| xobs | CarlFK: if I have time, perhaps. | 05:51 |
| CarlFK | neat - I wonder if there is room at the hackfest | 05:51 |
| futarisIRCcloud | CarlFK: Are you talking about the pynq.io boards? | 05:52 |
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| CarlFK | futarisIRCcloud: synaption[m] (standing here but not looged in)_ says "yes, well, pynq.io but the Zybo is the one with the camera) | 05:59 |
| futarisIRCcloud | Oh. Zybo Z7, I guess... | 06:03 |
| CarlFK | could be - he left for the night | 06:59 |
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| xobs | mithro: The good news is that I can verify that the USB shift register works, mostly. The CPU can read packets, and can send packets, and both the CPU and my logic analyzer are correctly decoding things! | 09:15 |
| xobs | The bad news is that the CPU isn't fast enough to do the MAC in software. | 09:15 |
| cr1901_modern | Is it running from flash? | 09:16 |
| xobs | No, BRAM | 09:16 |
| xobs | BROM? | 09:16 |
| cr1901_modern | uh oh... | 09:16 |
| xobs | I suspect the vexriscv interrupt latency is too long. | 09:16 |
| xobs | But that's okay! mithro is working on a USB state machine, so this is a solvable problem. | 09:17 |
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| mithro | xobs: It would be good to understand the actual latency of VexRISCV interrupts | 09:52 |
| mithro | xobs: The SYNC byte doesn't end up in the input FIFO | 09:52 |
| mithro | xobs: But you do need the SYNC byte in the output FIFO | 09:53 |
| xobs | mithro: It would. There are 18 instructions in the trap handler that execute before isr(), so that's certainly one source of latency. | 09:53 |
| mithro | xobs: 18!? | 09:53 |
| xobs | And I noticed that w.r.t. sync bytes. I added them in, and now I can NAK, though it's much too late for the host. | 09:54 |
| xobs | https://github.com/enjoy-digital/litex/blob/master/litex/soc/software/libbase/crt0-vexriscv.S#L16 | 09:54 |
| tpb | Title: litex/crt0-vexriscv.S at master · enjoy-digital/litex · GitHub (at github.com) | 09:54 |
| mithro | xobs: Yeah - but if you are successfully sending a NAK (even if too late), that is another good piece of the puzzle) | 09:56 |
| xobs | Oh, sometimes I even send ACK packets. Eventually. :) | 09:56 |
| * xobs uploaded an image: image.png (56KB) < https://matrix.org/_matrix/media/v1/download/matrix.org/lbuEDRAgNEmeCeRYmyXIWjDL > | 09:57 | |
| daveshah | I think at CCC we discussed that doubling the CPU clock frequency from 12 to 24MHz with some Yosys/nextpnr tweaks might be possible. I don't know if that would help | 10:00 |
| xobs | daveshah: it wouldn't hurt! but I think the real solution is to do a state machine in verilog. | 10:02 |
| mithro | xobs: I have SOF packets... | 10:06 |
| mithro | s/have/hate/ | 10:06 |
| mithro | xobs: https://github.com/mithro/valentyusb/issues | 10:06 |
| tpb | Title: Issues · mithro/valentyusb · GitHub (at github.com) | 10:06 |
| xobs | mithro: they're so very plentiful, though! the nice thing is you can probably ignore them completely, unless we decide to do something with them later. | 10:08 |
| mithro | xobs: Yeah, it makes hard debugging when you want to trigger on a packet | 10:10 |
| mithro | Interesting -> https://lwn.net/Articles/771621/ | 11:28 |
| tpb | Title: Device-tree schemas [LWN.net] (at lwn.net) | 11:28 |
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| mithro | xobs: You still up, or did you go to bed already like a sensible person? | 16:51 |
| mithro | xobs: Did you get anywhere with the USB? I might start working on it again in ~2-3 hours | 16:54 |
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| shorne | mithro: I am going to reply to the guy about nuttx | 21:22 |
| shorne | I have heard of it, I think its great, but really the OS support we listed is based on user/developer contributions | 21:23 |
| shorne | So far the real support it Linux (expiramental) and the litex firmware | 21:24 |
| shorne | Is that right? have we really done zephyr support? | 21:24 |
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| futarisIRCcloud | https://www.crowdsupply.com/1bitsquared/icebreaker-fpga/updates/35c3 | 23:49 |
| tpb | Title: iCEBreaker FPGA - 35c3 | Crowd Supply (at www.crowdsupply.com) | 23:49 |
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