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| 13:54.18 | legov | Does anyone have any experience here with interfacing cameras? |
| 13:54.38 | av500 | depends |
| 13:55.31 | legov | I'm working on a custom platform for capturing hd video |
| 13:55.43 | legov | Our hardware is designed to work with this camera module: http://www.e-consystems.com/MIPI-Camera-Board-AM-DM37x.asp |
| 13:56.01 | legov | It's an OV5640 sensor using the CSI-2 interface |
| 13:56.51 | legov | They provided a driver, but it's crap. We're currently getting 5 FPS on 720p capture... 30% of the overhead is from a memcpy necessary for the encoding (because the crappy driver). |
| 13:58.07 | legov | We have some ideas for how to increase this, for example, our ARM core and DSP aren't running at the clock rates they should be, but even with that we'll still not be where we'd like. |
| 13:58.53 | legov | e-consystems wants $20k for the source code to their driver... or they'll give it to us if we purchase 2k modules. We're a small shop and don't have the $. Certainly we won't be able to buy 2k modules for a while. |
| 14:01.23 | legov | What I don't know is whether or not we can use another module for which there's an opensource driver, or if we're stuck with this unless we change our hardware design. |
| 14:01.45 | XandriX | prp^2: quick question what toolchain would u suggest i use if i wer to just build a basic app for the juicebox ? |
| 14:01.52 | av500 | legov: what SoC? |
| 14:02.21 | legov | What's unclear to me is what this 'module' entails. OV5640 sensor... plus, what else? THere are opensource drivers out there for the OV5640 and similar omnivision sensors. Do we have to go with e-con for the module or could we just buy the sensor and plop it on our board? |
| 14:02.25 | legov | DM3730 |
| 14:02.39 | legov | Part #DM3730CBPD100 |
| 14:02.42 | av500 | right |
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| 14:04.55 | av500 | legov: the omap3 has no CSI |
| 14:04.58 | av500 | only parallel |
| 14:06.01 | av500 | which is fine since the omni has a parallel output |
| 14:06.48 | av500 | ah ok, it has both |
| 14:06.53 | av500 | the omni |
| 14:08.28 | legov | yes, we have the module working with our board on mipi csi2 |
| 14:10.59 | av500 | as I said, dm3730 has no csi |
| 14:11.25 | av500 | or it has |
| 14:11.34 | av500 | stupid pdf |
| 14:11.38 | av500 | so ok, it works |
| 14:14.24 | av500 | legov: so what driver are we talking about? |
| 14:14.52 | legov | I only have the binary provided by e-consystems for their module: http://www.e-consystems.com/MIPI-Camera-Board-AM-DM37x.asp |
| 14:15.45 | av500 | in what form? |
| 14:15.48 | av500 | kernel module? |
| 14:16.42 | legov | yes |
| 14:17.47 | av500 | can you upload it somewhere? |
| 14:18.53 | legov | yes - what will you do with it? |
| 14:19.24 | av500 | look into it |
| 14:19.30 | av500 | I doubt they write it from scratch |
| 14:20.04 | legov | thank you, give me a min |
| 14:20.26 | legov | I didn't write the camera control library that we're working on but it's based on the sample code they gave us to test the camera |
| 14:20.35 | legov | dstData = Buffer_getUserPtr(dspBuf); |
| 14:20.36 | legov | memcpy(dstData,data,size); |
| 14:20.37 | legov | Buffer_setNumBytesUsed(dspBuf, size); |
| 14:20.45 | legov | that's what's causnig 30% of our overhead |
| 14:21.16 | legov | rather we should be able to use a pointer to the data instead of having to copy it |
| 14:27.33 | av500 | close: http://subversion.assembla.com/svn/evaforge/trunk/software/gumstix/e_CAM50Driver/source/ov5642/sens_ov5642_ovt_5Mfix.c |
| 14:31.05 | av500 | thats DMAI? |
| 14:31.08 | av500 | Buffer_setNumBytesUsed(dspBuf, size); |
| 14:31.15 | av500 | and then? GST? |
| 14:32.29 | av500 | yes, you dont want that memcpy |
| 14:33.02 | av500 | what you want is to use user buffer with e.g. CMEM and let v4l2 capture into these |
| 14:33.14 | av500 | then you can pass them directly to the DSP for encoding |
| 14:35.32 | legov | Are you suggesting the driver should support that and it's the camera control code that's the problem? |
| 14:35.53 | av500 | the v4l2 driver should support USERPTR buffers |
| 14:36.03 | av500 | thats what we did on omap3 |
| 14:36.27 | legov | Can you identify that from the driver? I was told by the developer the driver did not have user mode pointer support. |
| 14:36.43 | av500 | I trust he spoke the truth |
| 14:38.43 | legov | Btw we are just writing to a file we are not using gst-dmai - that is somethign I'd like to implement down the road |
| 14:39.17 | av500 | ic |
| 14:40.02 | av500 | well, as said, 0 memcpy is doable |
| 14:40.14 | av500 | but I have no ideas if DMAI supports that |
| 14:40.23 | av500 | we never used that, it came after we did all our omap3 work |
| 14:40.26 | av500 | same with gst |
| 14:40.50 | av500 | so, their 5642 driver is GPL |
| 14:41.45 | legov | i see. how do you recommend I proceed if the driver does not have user mode pointer support |
| 14:41.59 | av500 | complain :) |
| 14:42.19 | av500 | if they dont do user mode, you have to fix it anyway |
| 14:42.27 | av500 | if they dont give you the source, start from the above |
| 14:42.33 | av500 | and make the 42->40 changes |
| 14:43.09 | av500 | then I have no idea how dmai handles user pointer |
| 14:43.33 | legov | should i be able to do that from the datasheets of the sensors? i don't know if there are any other hardware elements i have to account for. they're selling us a module (sensor + ??). |
| 14:44.57 | av500 | I doubt the module has more than sensor and PCB |
| 14:45.01 | av500 | no schematics? |
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| 14:48.17 | legov | i don't think so. were you able to deduce anything from looking at the v4l2 ko i sent you? |
| 14:51.38 | av500 | yes |
| 14:51.44 | av500 | http://subversion.assembla.com/svn/evaforge/trunk/software/gumstix/e_CAM50Driver/source/ov5642/sens_ov5642_ovt_5Mfix.c |
| 14:51.48 | av500 | its close to this one |
| 14:52.02 | av500 | http://subversion.assembla.com/svn/evaforge/trunk/software/gumstix/e_CAM50Driver/source/ |
| 14:52.52 | av500 | on what kernel are you? |
| 14:53.09 | legov | 3.0 |
| 14:54.08 | legov | The camera module is designed to integrate with http://www.logicpd.com/products/system-on-modules/zoom-dm3730-som-lv/ - we purchased one and then based our design of it. we are using the build environment provided by logicpd. |
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| 14:54.56 | av500 | yes, I get that |
| 14:55.00 | av500 | what the end use case? |
| 14:55.07 | av500 | record 720p and then? |
| 14:57.05 | av500 | legov: see the function omap_mmap() here: http://subversion.assembla.com/svn/evaforge/trunk/software/gumstix/e_CAM50Driver/source/omap_v4l2_fops_base.c |
| 14:57.17 | legov | this is r&d. we're still working on that. ideally capturing 1080p, sent over wireless to another receiver device from which you can change camera settings, capture to disk, stream it over rtsp... eventually detect motion, facial recognition, that type of stuff. |
| 14:57.39 | av500 | 1080 on omap3 - nope |
| 14:57.45 | av500 | 720, maybe |
| 14:58.16 | av500 | 720p encode will load the DSP 100% |
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| 14:59.44 | legov | ah, ok. |
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| 15:52.35 | landley | "Yup, that's a face." |
| 15:55.22 | av500 | :) |
| 15:55.36 | av500 | landley: will you send bc removal patches? |
| 16:04.46 | XandriX | o/ landley |
| 16:05.47 | landley | av500: nah, probably just implement bc in toybox. |
| 16:06.00 | av500 | watched your talk finally :) |
| 16:06.07 | landley | av500: yay. What did you think? |
| 16:06.30 | av500 | FSF does not like it :) |
| 16:10.16 | landley | As in the FSF has taken notice of it, or...? |
| 16:12.11 | landley | (That's kind of like saying a clown college in nebraska is deeply upset at my choice of footwear.) |
| 16:12.20 | landley | (Um... ok?) |
| 16:13.42 | landley | I'm not "against" the FSF any more than Torvalds is "against" microsoft. I just think they're counterproductive cluephobes and want them out of my way. |
| 16:19.48 | XandriX | landley: link to talk ? |
| 16:20.43 | landley | XandriX: www.youtube.com/watch?v=SGmtP5Lg_t0 |
| 16:28.58 | XandriX | thx :) |
| 16:29.05 | XandriX | toybox looks pretty nice |
| 16:30.06 | landley | XandriX: thanks. I'm trying as hard as I can... |
| 16:32.50 | landley | I'm working on an indiegogo (kickstarter variant) to see if any companies want to sponsor me to work on this full time for a while. |
| 16:33.11 | landley | http://landley.net/notes.html#19-05-2013 |
| 16:52.10 | XandriX | im wondering what toolchain i should use for an arm7 like the one in the juicebox |
| 16:59.35 | XandriX | *cross compiler |
| 17:07.55 | landley | I've been using an arm5 toolchain. |
| 17:08.08 | landley | It's like running 386 code on a pentium: works but not tuned for the chip. |
| 17:29.03 | XandriX | oh cool |
| 17:29.08 | XandriX | noted and thx :) |
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