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| MadHacker | hinzundcode: Run VGA a little slower than spec at 24MHz, divide by 2 to produce a 12MHz for the USB core? | 07:41 |
|---|---|---|
| xobs | hinzundcode: cool! nice job :) | 07:54 |
| xobs | You could try flopping a 48 MHz signal to produce the 12 MHz domain for USB. It's not great, but it could work. | 07:54 |
| MadHacker | Sadly I think he's gone, I posted before I realised. | 07:54 |
| MadHacker | Still cool, though. :) | 07:55 |
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| xobs | hinzundcode: cool! nice job :) | 08:08 |
| xobs | You could try flopping a 48 MHz signal to produce the 12 MHz domain for USB. It's not great, but it could work. | 08:08 |
| MadHacker | hinzundcode: Run VGA a little slower than spec at 24MHz, divide by 2 to produce a 12MHz for the USB core? | 08:08 |
| MadHacker | (as another option) | 08:08 |
| MadHacker | VGA's tolerance should be plenty to allow that. | 08:08 |
| hinzundcode | MadHacker: I tried running it at 24MHz and 12MHz, but i always had visual glitches | 08:08 |
| MadHacker | That's surprising. I know on a CRT that works rock-solid, but I'd have expected it to be OK on an LCD as long as your front/back porch times are reasonable. | 08:09 |
| xobs | An earlier version of foboot didn't use a PLL, and instead flopped the outputs for the 12 MHz domain. It's the whole reason Fomu uses a 48 MHz crystal. You tend to get synchronization issues when the FPGA becomes 99% loaded, though. | 08:09 |
| xobs | Perhaps it'll work better with the more efficient CDC that Valentyusb has now, too. | 08:10 |
| hinzundcode | xobs: thank you :) I changed the clock resource generator used in litex and replaced the pll with a simple clock divider. and usb still works :D | 08:10 |
| hinzundcode | my goal is to write to the framebuffer using wishbone-tool | 08:11 |
| hinzundcode | makes it a really simple usb graphics card ^^ | 08:11 |
| xobs | Cool! | 08:11 |
| MadHacker | :) | 08:11 |
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| hinzundcode | is it possible to access the wishbone bus over usb from within python? spawning wishbone-tool as a child process works but writing every single byte using a new process takes a looong time | 12:55 |
| xobs | Yes, but as I'm not so familiar with Python I can only point you in the right direction. | 12:56 |
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| xobs | Probably the easiest way to do it would be to run `wishbone-tool` in "wishbone server mode" (`wishbone-tool -s wishbone`), then connect to it using `litex_client`. | 12:58 |
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| xobs | That's located in `litex.tools.litex_client` in https://github.com/enjoy-digital/litex/blob/master/litex/tools/litex_client.py | 12:58 |
| tpb | Title: litex/litex_client.py at master · enjoy-digital/litex · GitHub (at github.com) | 12:58 |
| xobs | (You also can run a wishbone server entirely in Python, if you prefer) | 12:59 |
| hinzundcode | thank you :) | 13:01 |
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| hinzundcode | I ended up using CommUSB from litex.tools directly. works like charm :) | 14:07 |
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