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| 02:21.52 | sebas_ | hi there :) |
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| 03:32.59 | *** topic/#edev is Discussion of embedded systems (Hardware/Software/Linux/WinCE/Commercial Device Repurposing) : Busybox and Buildroot : http://www.elinux.org |
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| 04:51.29 | eephilli_ | I'm trying to wrap my head around a concept, I've got an embedded linux module running a web server. This module is also communicating to a micro-controller using SPI, or rather the web interface is serving as a control path to the micro-controller. I have to image it depends greatly on how all these parts are implemented, but can someone describe some of the more popular methods of implementing a web UI to SPI system. |
| 05:00.00 | MonMotha | eephilli_: there's actually lots of intermediate pieces of software |
| 05:00.46 | MonMotha | but the gist of a typical implementation that you describe would be that there would be a web server running on Linux running some sort of application-specific web application (e.g. CGI) that will bang on Linux's userspace SPI implementation |
| 05:00.55 | eephilli_ | thats what i'm finding, overwhelming, trying to find direction to narrow my focus |
| 05:01.23 | MonMotha | if Linux instead has a kernel-side SPI driver for your SPI device (which it sounds like it probably doesn't, but if it does), then that driver will probably expose some other API to userspace that the CGI app would twiddle |
| 05:01.58 | MonMotha | it need not be a CGI application, necessarily, it might be something like a Python, Lua, Ruby, etc. application with an integrated HTTP server |
| 05:02.38 | eephilli_ | nodejs came to mind, but i've seen tty implementations but nothing for spi as far as ive seen |
| 05:03.05 | MonMotha | you're very unlikely to find any off-the-shelf web application framework that knows how to talk to a SPI device:) |
| 05:03.20 | MonMotha | but IIRC there's a "userspace SPI" API that the Linux kernel exposes via sysfs |
| 05:04.07 | MonMotha | or maybe /dev |
| 05:04.30 | MonMotha | basically, you can talk to a "generic" SPI device (i.e. one that doesn't have a special in-kernel driveR) in Linux using standard file operations and ioctl |
| 05:04.41 | MonMotha | that can be done from basically any programming language |
| 05:06.00 | eephilli_ | did come across this http://beagleboardxm.org/blog/2011/03/22/progress-spi-is-working-on-the-beagleboard-xm/ |
| 05:06.24 | MonMotha | well, everything I've said assumes that the basic kernel SPI drivers (for your SPI host controller) are functional on your platform |
| 05:06.28 | MonMotha | if not, you've got some kernel hacking to do |
| 05:08.08 | eephilli_ | hoping to leverage Timesys for support on that if it comes to it |
| 05:09.19 | MonMotha | I've personally never been very happy with commercial embedded Linux distros. They're usually woefully out of date, but of course ymmv. |
| 05:10.19 | wmat | MonMotha: they're out of date by design |
| 05:10.41 | eephilli_ | http://www.kernel.org/doc/Documentation/spi/spidev |
| 05:11.17 | eephilli_ | wmat: is that a good thing or a bad thing? |
| 05:11.50 | SpeedEvil | eephilli_: yes |
| 05:11.55 | MonMotha | wmat: well, there's something to be said for "stability", but the last time I had the "privilege" of using timesys, the kernel was about 3-4 years old |
| 05:12.11 | MonMotha | eephilli_: that is basically the userspace SPI API, yes |
| 05:12.36 | wmat | eephilli_: a good thing for the commercial distributor and client, a bad thing for Linux |
| 05:12.53 | MonMotha | wmat: the problem I had was that their kernel didn't support everything on the chip, and some drivers had made it into mainline, but in a much newer kernel that made backporting or forward-porting quite difficult |
| 05:13.12 | MonMotha | I ended up forward-porting the few drivers I needed from timesys into the "current" mainline |
| 05:13.20 | wmat | yep, sounds normal |
| 05:13.40 | MonMotha | most of the drivers had been reimplemented in a much cleaner way in mainline, so that seemed to make sense |
| 05:14.26 | wmat | I will never fully comprehend why everyone doesn't track mainline |
| 05:14.51 | MonMotha | wmat: especially nowadays that git makes it so freaking easy |
| 05:15.10 | wmat | exactly |
| 05:15.56 | wmat | sleep |
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| 05:17.38 | eephillip | waa connection hiccup |
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| 05:20.22 | eephillip | interesting concept of using cgi as a method to interface spi, didn't think it could do that |
| 05:21.09 | MonMotha | eephillip: it can't directly. CGI just runs any old application you ask it to on the server. |
| 05:21.16 | MonMotha | That application can do whatever it wants, like talk to SPI |
| 05:31.57 | eephillip | MonMotha: cool, thanks for the info, looking forward to digging in on this one |
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| 16:38.14 | CosmicPenguin | kergoth: bailin' on VIM? Don't let the inquisition know... |
| 16:38.44 | prpplague | CosmicPenguin: hey, you ever used vmware under linux to run windows? |
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| 16:39.59 | CosmicPenguin | I used to |
| 16:40.24 | CosmicPenguin | I moved to virtualbox at home and like it way more |
| 16:40.58 | prpplague | CosmicPenguin: hmm, i have a hd loaded with windows7 and orcad, i need something to run it on so i can convert a bunch of my projects over to kicad |
| 16:41.41 | prpplague | CosmicPenguin: my understanding is i can add the hd to my linux box and have vmware boot that hd, does that sound correct? |
| 16:42.43 | CosmicPenguin | Yeah, thats my understanding |
| 16:43.01 | CosmicPenguin | I have an HD on my system here at work that still runs Windows, prseumably |
| 16:43.11 | CosmicPenguin | though its been a few years since I've booted it |
| 16:43.20 | CosmicPenguin | with vmware that is |
| 16:45.22 | kergoth_ | CosmicPenguin: heh, I'm starting to lean toward tools that work a bit more sanely out of the box, as opposed to requiring assloads of config tweaks to even be useful |
| 16:45.38 | CosmicPenguin | Man, I hit that point years ago |
| 16:45.55 | CosmicPenguin | About the time I said - why the hell am I running fvwm2? |
| 16:46.07 | kergoth_ | haha, yeah |
| 16:46.23 | kergoth_ | I'm playing around with using xfce and using tmux for my terminals instead of using a tiled wm |
| 16:46.52 | kergoth_ | I feel so ordinary now! |
| 16:46.54 | kergoth_ | hehe |
| 16:47.54 | CosmicPenguin | nothing wrong with xfce and tmux, thats what i'm running right now |
| 16:48.11 | prpplague | CosmicPenguin: what was your impression of using vmware? |
| 16:48.16 | CosmicPenguin | meh |
| 16:48.22 | CosmicPenguin | I liked virtualbox way better |
| 16:48.37 | prpplague | not familiar with virtualbox |
| 16:48.43 | prpplague | googles |
| 16:48.48 | CosmicPenguin | in conjunction with the other conversation, vmware is too powerful |
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| 16:49.42 | prpplague | CosmicPenguin: hmm, i guess i can try virtualbox first |
| 16:50.40 | CosmicPenguin | I got a lenovo laptop which came with win7, so I figured as long as I had a license, I might as well do an instance |
| 16:50.43 | CosmicPenguin | virtualbox worked great |
| 16:50.56 | CosmicPenguin | And you are talking to somebody who has very little experience with any sort of vms |
| 16:51.24 | Pandragoq | good morning :) |
| 16:51.31 | CosmicPenguin | Most of the time the stuff I'm working on has trouble running a single operating system |
| 16:52.46 | Pandragoq | i've found a log with you guys talking about a customer display.... and i'm facing some issues also with the same model :P |
| 16:53.42 | prpplague | CosmicPenguin: i'll try virtualbox this evening |
| 16:54.24 | CosmicPenguin | prpplague: you're getting better with the photoshop - nice lighting job on the last one.. :) |
| 16:54.57 | prpplague | CosmicPenguin: hehe, thanks, just spending more time on it, hehe |
| 16:55.14 | prpplague | CosmicPenguin: for some strange reason, doing those is very relaxing for me |
| 16:55.17 | prpplague | CosmicPenguin: go figure |
| 16:55.53 | prpplague | CosmicPenguin: holy cow |
| 16:55.57 | prpplague | CosmicPenguin: https://plus.google.com/u/0/notifications/all/z13fijzz1znrgt4yo04cdjsqwxygctayj4c/op/lb#notifications/all/z13fijzz1znrgt4yo04cdjsqwxygctayj4c/op/lb |
| 16:59.40 | Pandragoq | hello?? |
| 16:59.59 | CosmicPenguin | Pandragoq: go ahead and ask your question |
| 17:00.19 | Pandragoq | all right, i don't wanna bother.. |
| 17:00.33 | Pandragoq | it's a LD1000, with usblcpd driver installed |
| 17:01.29 | Pandragoq | it compiles fine, inserted in the kernel fine, but when i try to use /dev/usb/lcpd it answers with No such device |
| 17:02.23 | Pandragoq | and i've been a couple days stuck in the same spot, ran out of ideas to make it work :( |
| 17:23.22 | Pandragoq | actually, i just found that the log i'm referencing... is from 2008 :P |
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| 18:23.25 | kergoth_ | i use vmware player from time to time, but should give virtualbox another shot. haven't played with it in a while. should poke at qemu some more too, really |
| 18:23.28 | kergoth_ | hm |
| 18:25.03 | prpplague | kergoth_: thanks |
| 18:25.17 | prpplague | kergoth_: really don;t want to buy another pc just to port my orcad projects |
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| 18:31.01 | kergoth_ | heh, don't blame you |
| 18:31.27 | kergoth_ | vmware player works quite well, not as powerful as workstation, but still functional, and free. either that or virtualbox should work fine |
| 18:31.40 | kergoth_ | used it to migrate his work laptop to linux while retaining the corporate windows install for IE |
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| 18:35.31 | wmat | should do that |
| 18:39.25 | wmat | huh, the vCenter Converter is free, I didn't expect that |
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| 22:55.23 | MonMotha | kergoth_: I've found the Xen HVM stuff surprisingly performant and reasonably easy to use |
| 22:55.32 | MonMotha | Installing WinXP on it seems to go quicker than on real hardware |
| 22:55.45 | MonMotha | and it's free/oss/etc. |
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| 23:20.09 | kergoth_ | ah, nice, will have to look at that again |
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