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| cfelton | MaZderMind: might be easiest to route the I2C signals to a header (directly) versus cutting up a cable, break out as scl_i, sda_i, and sda_o | 01:22 |
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| CarlFK | cfelton: low hanging fruit that is kinda needed https://github.com/timvideos/HDMI2USB/issues/102 | 01:52 |
| tpb | Title: Map 720p and 1024x768 to a hardware switch · Issue #102 · timvideos/HDMI2USB · GitHub (at github.com) | 01:52 |
| CarlFK | mithro: is this the feature? related to getting some diagnostics that might help with the edid problem? https://github.com/timvideos/HDMI2USB/issues/44 | 01:55 |
| tpb | Title: Connect the USB-UART connector to the control system inside the firmware · Issue #44 · timvideos/HDMI2USB · GitHub (at github.com) | 01:55 |
| mithro | cfelton: they are already available via a header | 03:50 |
| mithro | (on the Atlys board) | 03:59 |
| mithro | https://github.com/timvideos/HDMI2USB/wiki/Digilent-Atlys-Board:-Loading-Firmware#stage--1 | 04:01 |
| tpb | Title: Digilent Atlys Board: Loading Firmware · timvideos/HDMI2USB Wiki · GitHub (at github.com) | 04:01 |
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| MaZderMind | just re-implemented the gst-switch video comparison routines - i think the tests are pretty readable now: https://github.com/MaZderMind/gst-switch/blob/int-tests-rewrite2/python-api/tests/integrationtests2/test_video.py#L82 | 09:47 |
| tpb | Title: gst-switch/test_video.py at int-tests-rewrite2 · MaZderMind/gst-switch · GitHub (at github.com) | 09:47 |
| MaZderMind | and they don't fail randomly on travis anymore | 09:47 |
| MaZderMind | some parts are still missing but not more then a weekend worth of work | 09:47 |
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| mithro | MaZderMind: I'll try and have a look at it tomorrow | 10:20 |
| mithro | MaZderMind: please ping me if I haven't responded by the end of the week | 10:20 |
| mithro | If I could do Debconf, FrosCon and CC-Camp with the aim of working on the TimVideos stuff - that might be enough to get me over. | 10:22 |
| mithro | bblr, heading home | 10:23 |
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| MaZderMind | mithro: I'll finish the Tests, reword the READMEs and the PR and come back to you then | 10:37 |
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| CarlFK | mithro: (bump) is this the feature? related to getting some diagnostics that might help with the edid problem? https://github.com/timvideos/HDMI2USB/issues/44 | 14:32 |
| tpb | Title: Connect the USB-UART connector to the control system inside the firmware · Issue #44 · timvideos/HDMI2USB · GitHub (at github.com) | 14:32 |
| cfelton | CarlFK: in general it should, you could include a parallel EDID dump to the UART | 14:45 |
| CarlFK | cfelton: good morning | 14:45 |
| cfelton | CarlFK: hello | 14:45 |
| cfelton | in this case, using the USB-UART would only be somewhat beneficial | 14:46 |
| cfelton | it would be more of a test case for the diag port | 14:46 |
| CarlFK | EDID is just a lump of static bytes that get sent. ... yeah never mind that. | 14:46 |
| cfelton | yup, looking at the HDL my guess is an odd timing thing, like missing a i2c restart or something | 14:47 |
| CarlFK | I have a "LENOVO ThinkPad Twist 33474HU" with 2 external ports: mini hdmi and display port | 14:48 |
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| CarlFK | display port to hdmi dongle, to atlys, no problem. like I don't think it has ever malfunctioned | 14:49 |
| cfelton | the irony, more complicate - more reliable :) | 14:50 |
| CarlFK | mini hdmi to atlys, malfunctions about 1/2 the time, with what looks like 5 or 6 flavors | 14:50 |
| CarlFK | but it also jams up my box so trying to collect stats and figure out what is going on gets difficult | 14:50 |
| cfelton | doh | 14:51 |
| CarlFK | it might help if I shut down X | 14:51 |
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| MaZderMind | cfelton: i thought also about a timing issue or clock jitter. should be very obvious on a scope | 20:08 |
| cfelton | MaZderMind: i2c is slow and source sync, there more than likely will be jitter :) | 20:09 |
| cfelton | what is probably the most interesting is the slew rates but you would need to look at the physical signal (not routed to a pin) | 20:10 |
| cfelton | i2c is open-collection, pulled low by the FPGA driver and then high by external pull-up resistors | 20:10 |
| MaZderMind | hm that would require a hdmi interception board that pulls out the different signals | 20:10 |
| MaZderMind | or a dismanteled cable | 20:11 |
| MaZderMind | but it's all thery until one measures it ^^ | 20:12 |
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| CarlFK | MaZderMind: did you send mithro your address? | 20:16 |
| cfelton | MaZderMind: SCL and SDA are not diff signals in the connector | 20:18 |
| cfelton | MaZderMind: sorry, misread | 20:18 |
| cfelton | yes, would require dismantle cable or a breakout connector | 20:19 |
| MaZderMind | CarlFK: yes, the package is on the road | 20:19 |
| CarlFK | :) | 20:19 |
| MaZderMind | cfelton: i did that for ethernet too to measure the levels (just out of curiosity), will do that for hdmi, too, when the board arrived | 20:20 |
| MaZderMind | but i guess i'll need some weeks to get into fpgas and the whole suit of tools required | 20:21 |
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