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| 15:08.10 | Mephisto__ | Okay I might be off topic in here but maybe someone came across the same thing: hello I'm compiling qt-embedded and I'm having some trouble here when trying "gmake" here's where it fails, plz help http://dpaste.com/730163/ |
| 15:10.18 | *** join/#edev MacChesney (~MacChesne@cm80.epsilon99.maxonline.com.sg) |
| 15:10.26 | MacChesney | hello |
| 15:11.11 | MacChesney | does anyone know any good resources for learning about embedded systems? |
| 15:11.29 | MacChesney | Im interested in designing a simple digital camera |
| 15:11.50 | MacChesney | Can anyone point me in a good starting direction? |
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| 15:51.15 | landley | MacChesney: learning what? |
| 15:51.18 | landley | And he's gone... |
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| 17:06.22 | gkwhc | hi, might anyone have experience using programmable oscillators? i'd like to output 24MHz and also 24.576, but I am not sure if programmable oscillators support such kind of division/multiplication |
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| 18:49.22 | prpplague | man i am really going to miss G+ if they don't make some changes to the new UI, i just don't think i can use it as is |
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| 18:57.43 | CosmicPenguin | Can anybody explain to me the reasoning behing VM space allocations for mmap? |
| 18:58.16 | CosmicPenguin | Silly me, I thought that if you did two maps that they would be reasonably close together, even contigious in many cases |
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| 20:29.10 | FrostEyes | Hi folks |
| 20:30.21 | FrostEyes | Is there anybody of you who have worked with programming low level usb device drivers? |
| 20:30.48 | FrostEyes | I have some problems with the USB hardware on a freescale iMX 51 |
| 20:46.12 | landley | There's a new uClibc++ release. |
| 20:46.14 | landley | The mind boggles. |
| 20:46.30 | landley | (And a new uClibc, but it's only a dot release that one.) |
| 20:46.58 | landley | FrostEyes: would you like a url to a 2.8 gigabyte tutorial video of Greg KH explaining to a classroom of people how to write USB device drivers? |
| 20:47.27 | landley | It's http://landley.net/kdocs/local/2008_driver_writing_tutorial_gregkh.avi by the way. |
| 20:47.40 | alex4nder | FrostEyes: what's the problem you're having? |
| 20:48.08 | landley | CosmicPenguin: they intentionally induce jitter to piss off virus writers. |
| 20:49.01 | FrostEyes | Thanks Landley! |
| 20:49.12 | FrostEyes | The problem is with priming the endpoint for reading |
| 20:49.35 | FrostEyes | It is a bare bone system, with a home made OS. |
| 20:50.41 | FrostEyes | Status is that the enumeration process is starting. The first status for getdescriptor is received, and I can prime the in endpoint with data to the host.. |
| 20:51.10 | FrostEyes | But when i prime the endpoint for reading the host handshake. The device does not accept it |
| 20:51.23 | landley | FrostEyes I'd prefer if you download that rather than trying to view it online. It's sort of ginormous and my website's only got so much bandwidth... |
| 20:51.34 | alex4nder | FrostEyes: what does the bus traffic look like when that happens? |
| 20:51.42 | alex4nder | is there a timeout, or something else? |
| 20:52.27 | FrostEyes | landley: ok. I will download it tomorrow when I am at work (Right know i am at home on a slow connection). |
| 20:53.41 | FrostEyes | alex4nder: the bus traffic is after the in data (the descriptor from the device). The out request is NAK. The host then sends around a million ping's which is all NAK'ed |
| 20:53.54 | FrostEyes | The hardware should ACK as soon it was primed for reading. |
| 20:54.49 | alex4nder | right, so your USB stack isn't configuring the imx hardware right? |
| 20:55.00 | alex4nder | did you write your device stack from scratch? |
| 20:55.09 | FrostEyes | Yes |
| 20:55.29 | FrostEyes | I have just got some example code up an running from freescale |
| 20:55.37 | alex4nder | ok, so what's your question/how can people help you? |
| 20:55.48 | alex4nder | if you know the hardware is misconfigured and doing the wrong thing |
| 20:58.04 | FrostEyes | I expect the hardware to be misconfigured in some way. But I have not found where yet. Everthing I have checked look correct. (dTD's, dQH's alignment e.g.) |
| 20:58.42 | FrostEyes | So, if some of you have worked with the hardware and know that the manual is missing some very importent stuff. |
| 20:58.58 | alex4nder | well USB stacks suck to implement |
| 20:59.08 | FrostEyes | oh yes. |
| 20:59.08 | alex4nder | (IMHO) |
| 20:59.21 | alex4nder | so I'd go through and sanity check all of your configuration registers. |
| 20:59.31 | alex4nder | at least you're functionally failing early on |
| 20:59.38 | FrostEyes | yes |
| 21:00.02 | alex4nder | have you compiled and tried out one of their examples in your dev environment, and you can get the example working? |
| 21:00.07 | FrostEyes | I was also started on that.. Just created a register dump from the example code.. |
| 21:00.13 | FrostEyes | Yes |
| 21:00.39 | alex4nder | so if it were me, I'd compare register configurations |
| 21:00.50 | FrostEyes | So I was just started at that |
| 21:00.50 | alex4nder | and go from there |
| 21:00.53 | alex4nder | cool |
| 21:01.44 | FrostEyes | My experience with freescale and their iMX documentation is not good.. I have looked at some code from their BSP, where there is used som registers which is not mentioned in the documentation |
| 21:02.10 | FrostEyes | It is first in the last errata they are mentioned.. |
| 21:02.40 | FrostEyes | Thanks for the talk :) |
| 21:02.49 | alex4nder | np, good luck |
| 21:04.06 | FrostEyes | Of cause it is no problem if you use their bsp. But if you need to create a very specific system on it, it is annoying. |
| 21:04.21 | alex4nder | yes, that is the story of every embedded programmer's life |
| 21:04.36 | alex4nder | the worst being when instead of documentation, they provide you with cheeseball reference code. |
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| 22:06.18 | CosmicPenguin | landley: indeed - I just saw that |
| 22:06.26 | CosmicPenguin | stupid random be less random |
| 22:36.15 | landley | CosmicPenguin: there's a kernel .config option you can use to switch it off, I believe. |
| 22:36.51 | CosmicPenguin | Though thats not likely to be something to happen in production |
| 22:37.30 | CosmicPenguin | It turns out that the worse case alogrithm for that feature is to do lots and lots of single page maps |
| 22:37.39 | CosmicPenguin | and then try to allocate something big - fragmentation city |
| 22:37.56 | CosmicPenguin | Fragmenetation city is not a fun place to live |
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| 23:33.04 | isaacbw | I have a Beaglebone and I've been trying to figure out how to hook up this ks0108 based lcd screen I have. I've stumbled around and found mention of the ks0108 in linux kernel docs (http://www.mjmwired.net/kernel/Documentation/auxdisplay/ks0108). Does that mean that the ks0108 is supported out of the box? Would someone be able to point me in the right direction as far as getting this all hooked up? I know I could just control it with gpios |
| 23:33.04 | isaacbw | <PROTECTED> |