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| xobs | I managed to get the picorv spi block working in litex, and I think that the reason it was't working is that I need to swap endianness for riscv. I'll give that a shot tomorrow! If that works, then you'll be able to use Foboot to load riscv code. | 14:45 |
|---|---|---|
| xobs | I also got a frist draft of a 3D case done, in case people want to 3D print one of their own. | 14:48 |
| CarlFK | xobs: are you coming to Latch-up in Portland next month? | 14:55 |
| CarlFK | https://fossi-foundation.org/latchup/ | 14:55 |
| tpb | Title: Latchup (at fossi-foundation.org) | 14:55 |
| AmosSam | xobs: didn't you said that you use vexriscv? So, foboot will be able to load either bitstream or riscv code? Wow | 14:56 |
| xobs | CarlFK: I wasn't planning on it. It does seem interesting, but I'm not sure I have the time/funding. Let me look. | 14:59 |
| CarlFK | there will be a fpga hackfest on Friday | 14:59 |
| CarlFK | either at the venue or a portland hackerspace | 14:59 |
| xobs | AmosSam: Yeah, it'll look for the sync pulse that indicates an ICE40 bitstream, and if it doesn't see it then it will just jump to the address. | 14:59 |
| xobs | Maybe a program header is in order... | 15:00 |
| CarlFK | hackerspace is open all night, venue is closer to hotels. | 15:00 |
| AmosSam | And will picorv core have access to usb? | 15:04 |
| xobs | AmosSam: I'm just using the picorv SPI hardware. It's still the vexriscv code. | 15:05 |
| xobs | Basically, since I'm not doing a reset, anything the bootloader has access to the program can do. | 15:06 |
| xobs | So you'll be able to write a USB driver, yeah. | 15:06 |
| AmosSam | So, for program to communicate over usb, it will "only" need usb driver? | 15:07 |
| AmosSam | Great! | 15:07 |
| xobs | Yep! It's a way for people to get started with Fomu, programming RISC-V. | 15:07 |
| AmosSam | And still have access to fpga if they want/need it. I like it :-D | 15:09 |
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| mithro | xobs: Yes, the plan is to hack on litex / timvideos / fomu stuff at the hackfest before LatchUp | 15:54 |
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| mithro | xobs: Might be of interest to you -> https://github.com/eda-ricercatore?tab=repositories | 17:09 |
| tpb | Title: eda-ricercatore (Zhiyang Ong) / Repositories ยท GitHub (at github.com) | 17:09 |
| mithro | std-cell-library-characterization - A repository for my experimental results, and scripts to process, analyze, and interpret them. | 17:09 |
| mithro | https://github.com/eda-ricercatore/Modica-SRAM - Design of a 32-kbit synchronous SRAM with 32-bit words, using 180 nm process technology. | 17:10 |
| tpb | Title: GitHub - eda-ricercatore/Modica-SRAM: Design of a 32-kbit synchronous SRAM with 32-bit words, using 180 nm process technology. Developed MATLAB scripts to evaluate architectural trade-offs between performance (using logical effort analysis) and area usage; see the source code for the HSPICE decks and MATLAB scripts that are used during architectural trade-off evaluation, and characterization of inverters for different supply voltages (VDD) and temperatures. It also includes HSPICE decks for the characterization of the 6-transistor SRAM cell for different transistor ratios, and the SRAM read and write circuitry. Co-designed and co-developed the SRAM using schematic entry in Cadence Virtuoso. Performed functional and timing verification by simulating extracted SPICE netlist in NanoSim. (at github.com) | 17:10 |
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| m_w | xobs: I heard you might have some insight about creating test fixtures | 18:24 |
| m_w | xobs: if you have some pointers it would be greatly appreciated; sourcing the clamp down fixture and software infrastructure | 18:26 |
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| MadHacker | m_w: https://github.com/exclave/exclave on the software side; xobs's test runner. | 18:33 |
| tpb | Title: GitHub - exclave/exclave: Exclave embedded service runner (at github.com) | 18:33 |
| m_w | nice | 18:35 |
| m_w | so now I just need some pointers for the hardware side | 18:35 |
| MadHacker | The clamps themselves are easily available - amazon and ebay even - but making a good fixture is a bit more complex than just the clamps. | 18:35 |
| MadHacker | Pogo-pins are no fuss to get either, if you want to DIY it. | 18:35 |
| MadHacker | But getting it right as opposed to "it kinda works" takes a bit of experimentation. | 18:36 |
| m_w | I have made a simple fixture with pogo pins before | 18:36 |
| m_w | for LoFive | 18:36 |
| m_w | but it use 3D printed parts and eventually it broke | 18:37 |
| m_w | I want something a bit more rugged for the base | 18:37 |
| MadHacker | Laser cut and/or CNC'd acrylic is the usual preference. | 18:37 |
| MadHacker | Although heavy paxolin is nice too. | 18:37 |
| m_w | https://www.bunniestudios.com/blog/?p=5450 | 18:38 |
| m_w | wonder how much of these fixtures is custom? | 18:38 |
| MadHacker | Well, the box at the bottom is sometimes a generic project/electrical box milled out. | 18:39 |
| MadHacker | The upright structure is the same for most similar jigs, so it's probably not exactly custom, but it's not off-the-shelf. | 18:39 |
| MadHacker | That particular one has nice linear slides on the verticals; it's common just to use slots in the uprights as guides. | 18:40 |
| m_w | yeah I just need a good starting point | 18:44 |
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