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| swetland | Figured out the Icesugar Pro HDMI issues: | 11:10 |
|---|---|---|
| swetland | https://github.com/enjoy-digital/litex/pull/1290 | 11:10 |
| swetland | https://github.com/litex-hub/litex-boards/pull/388 | 11:10 |
| tnt | why would that be needed on that board and not ulx3s ? | 11:18 |
| swetland | I assume different electrical situation on the hdmi wiring | 11:19 |
| swetland | it might be good on ulx3s too, haven't tested there | 11:20 |
| swetland | what I know is I could not get my Dell monitor to recognize output from the ISP with the same timing as on ULX3S, and when I looked at the demo colorbars project on the ISP github they drive both p and n, so I adjusted to do that and I get a working display | 11:21 |
| swetland | I know from putting a scope on the Rs or Cs in front of the HDMI connector on the ISP that with the litex build, out of the box, the p pins have signal and the n pins do not | 11:21 |
| tnt | Mmm ... the icesugar platform file is wrong. | 11:23 |
| tnt | IOStandard("LVCMOS33") on the HDMI lines should be IOStandard("LVCMOS33D") | 11:23 |
| tnt | the "D" is for pseudo differential, which enables all that stuff internally to the fpga. | 11:23 |
| swetland | bloody hell | 11:24 |
| swetland | I thought I checked that | 11:24 |
| swetland | well that was a bunch of painful python plumbing for nothing ^^ | 11:24 |
| swetland | though I do think the clock changes are still good. | 11:25 |
| tnt | yeah probably good to have defaults that meet timing. | 11:25 |
| swetland | I'm rebuilding to verify but I'm about 100% certain adjusting the iostandard will indeed resolve the signal issue | 11:30 |
| swetland | plus side: much cleaner fix | 11:30 |
| swetland | ERROR: cannot place differential IO at location PIOB | 11:33 |
| swetland | unclear which IO it dislikes | 11:33 |
| tnt | Oh, well I guess that's why it was that way ... | 11:34 |
| swetland | the display *works*... but I'm not sure why now | 11:35 |
| tnt | huh ? If it said "error" it wouldn't have rebuild the bitstream right ? | 11:35 |
| gatecat | > ERROR: cannot place differential IO at location PIOB | 11:37 |
| gatecat | you could still perhaps use LVCMOS33D by changing the IO constraint to be on the PIOA side and then invert the data, assuming the PIOA is indeed used for the - side | 11:37 |
| swetland | ah I guess I'm used to vendor tools having a generous idea of success | 11:38 |
| swetland | do you know where I can find the map of the corresponding pins for PIOA/B/etc? some lattice doc presumably? | 11:39 |
| gatecat | yeah there should be a spreadsheet | 11:43 |
| swetland | there we go. found it | 11:44 |
| swetland | ye gods. they are all over the bloody place | 11:50 |
| swetland | only data2p/data2n are actually situated on a differential pair | 11:50 |
| swetland | only data2p/data2n are actually situated on the same differential pair | 11:51 |
| tnt | :/ I guess the icesugar-* designer didn't improve. the ice40 one already had some very questionable choices. | 11:55 |
| swetland | the board otherwise seems functional enough. I wish more ULX3Ses were more rapidly available, but this was better than nothing. | 11:57 |
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