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| Brighton | Hi everyone, | 05:59 |
|---|---|---|
| Brighton | Referred to the group by Tisham | 05:59 |
| xobs | hello! | 06:06 |
| Brighton | hello | 06:07 |
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| Nordin | Yo all. Is this a place for the Fomu owners too? | 09:28 |
| Nordin | Or is there an 'ARM vs FPGA' rivalry thing like Jets Vs Sharks Westside story style? :p | 09:31 |
| xobs | We do both! Though it's been mostly Fomu lately. | 09:45 |
| Nordin | Oh goodo. Fomu owner here. Just done the workshop materials and hungry for more | 09:50 |
| Nordin | I was given a Fomu by a friend at my hackerspace. | 09:51 |
| acathla | So was I :) | 09:58 |
| Nordin | acathla: Have you almost lost yours yet? Holy cow these things seem to hid behind atoms. | 09:59 |
| Nordin | *hide | 10:00 |
| xobs | What are you looking to do with it? | 10:00 |
| acathla | Nope, it's here, working fine with the tinyfpga_bx | 10:00 |
| MadHacker | They really do. I have half a dozen variations on the theme and they're somewhat invisible. | 10:00 |
| * ssb already spent 2h searching his fomu around his desk, cumulatively | 10:02 | |
| acathla | Check all your USB ports =) | 10:05 |
| Nordin | xobs: I had an ATtiny with an RGB led that I used with an RTC as a watch. I gave a colour to each number and it would 'flash' the time as a sequence of colours. Might recreate that for kicks if it can keep time ok. | 10:08 |
| Nordin | The ATtiny was a 'digispark' if you ever saw that. | 10:10 |
| MadHacker | There's a proper crystal on there. Should work. Stick it in one of the tiny USB chargers? :) | 10:12 |
| Nordin | That raises a good point. What voltage does it start browning out at? The FPGA runs off 1.3v I read. | 10:16 |
| Nordin | MadHacker: yeah great to see it. | 10:16 |
| MadHacker | Nordin: Much higher than the 1.3. The core is that voltage but I/O is at 3.3. | 10:20 |
| Nordin | ah | 10:21 |
| MadHacker | The regulators look like they have an 80mV (typ, 190 max) dropout, so you're looking at 3.4V or thereabouts, I guess. | 10:24 |
| MadHacker | It'll be a little load-dependent as usual. | 10:24 |
| Nordin | oh sure | 10:24 |
| MadHacker | If you're running off a 3V lithium or something, I guess you could bypass the 3.3v regulator? The ice40 has a max of 3.45 or so, but a diode drop would bring that into range. | 10:26 |
| MadHacker | Minimum for the ice40 is down at 1.8ish for I/O, so you have some slack. | 10:27 |
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| Nordin | wee form factor 3.7v lipo is my usual (have loads). I'd house the batt in the strap maybe. | 11:10 |
| MadHacker | Might be OK. Have to just try it out really. | 11:27 |
| acathla | Is it possible to use foboot on a tinyfpga-bx? | 11:50 |
| xobs | acathla: almost. I think there's a clock domain crossing issue. | 12:02 |
| xobs | Though that might only be in the debug module. | 12:02 |
| acathla | xobs, Do you know if someone tried to port it? | 12:06 |
| xobs | acathla: I know I've been working on a side project that has a 48 MHz clock, but so far I've only got the dummyusb ported. | 12:15 |
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| acathla | I've got a "ModuleNotFoundError: No module named 'litex.soc.integration.doc'" when trying to build foboot, but module works fine if imported directly. May be a python problem... | 14:39 |
| acathla | Okay, it's circular dependencies... | 15:05 |
| xobs | acathla: Do you need to update by doing a "git submodule update" / "git submodule sync"? | 15:07 |
| acathla | I had valentyusb installed globaly, foboot didn't like it | 15:11 |
| xobs | Whoops | 15:11 |
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| acathla | Ok, foboot builds with --no-cpu option. Without, it cannot find <stdint.h>. Why is it so complicated? a simple test.c with that include works nicely (with the same riscv32-unknown-elf-gcc) | 16:12 |
| xobs | What platform is this? | 16:17 |
| xobs | I ask because the all-in-one toolchain has riscv64-unknown-elf-gcc, not riscv32 | 16:18 |
| xobs | https://github.com/im-tomu/fomu-toolchain/releases/latest | 16:19 |
| tpb | Title: Release v1.4: build: update nextpnr, wishbone-tool, and icestorm · im-tomu/fomu-toolchain · GitHub (at github.com) | 16:19 |
| acathla | I removed the risc64 toolchain so it's only the risc32-unknown-elf-gcc 9.2.0 from... the sources I guess | 16:24 |
| acathla | xobs, same error with your toolchain | 16:34 |
| acathla | it's a Makefile error since both gcc were able to build and find their libs correctly | 16:37 |
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