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| muuo | Hello everyone! So I'm probably in over my head here, but as a first project, I'm trying to drive an led panel with the icebreaker bitsy. I've been struggling along with it and finally figured out how to setup a testbench and simulate the design with iverilog and visualize the waveforms with GTKWave. I've gotten to the point where the waveforms in GTKWave match my expectations, but the actual waveforms I see from the device (On an oscilloscope) diff | 05:36 |
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| muuo | Some of the waveforms (clocking signals) match the simulated ones, but others are completely flat. | 05:38 |
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| Xark | muuo: Maybe output a test signal, or swap some signal pins as a sanity check (of GPIO and probing)? | 06:28 |
| muuo | Thanks Xark! I think I've tried that. It seems like the issue is with the registers. Assigning them to different pins doesn't work; but assigning working registers to those pins works. | 06:30 |
| muuo | So it seems like there's a logic error that only manifests on the device, and not in iVerilog? | 06:30 |
| Xark | Does your design meeting timing constraints? You might also try "verilator" with --lint_only if you haven't (finds picky "warnings"). | 06:31 |
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| muuo | Hmm, thanks Xark! Haven't tried that yet. | 06:43 |
| muuo | I'll give it a go. | 06:44 |
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| tnt | muuo: is your code posted somewhere ? | 07:19 |
| muuo | tnt: No, not yet. I'll try and put it up somewhere later this week if it keeps giving me trouble. | 07:23 |
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| hexcoherand | Hi everyone. Among (too) many other projects, I've been trying to build something like "Cheat Engine" for debugging robot toys. I have a prototype with some commercial hardware, but this now has me wondering and worried about pipeline latency with an awkward embedded USB controller. | 19:00 |
| hexcoherand | Does anyone here know of a compact FPGA eval kit with a working CAN transciever, camera, and ideally cell radio? | 19:01 |
| hexcoherand | Here's a lazy preview of what I had with a "comma two": http://cannoli.monster/shanty.gif | 19:10 |
| hexcoherand | I've been exploring logic programming for work projects and this toy also really got me wondering about GTKWave performance. I got frustrated that I could shuffle video frames and values around so quickly but I can't in GTKWave. So I've started building something with the same ideas and base project for viewing .fst files. | 19:15 |
| hexcoherand | A mixed signal team at work is already exploring SkyWater 90nm with existing PDKs and they're starting to need a lot of extra custom engineering with a local fab. I'd really like them to build as much as possible on OpenLANE but I really need help enlightning them. | 19:24 |
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