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| 02:29.07 | Dufflepod | My head's fried, been disassembling for about 10 hours today. :-( |
| 02:46.18 | MonMotha | yeah, that'll fry your brain pretty nicely |
| 02:46.23 | MonMotha | do you at least have Ida or something like that? |
| 02:47.04 | Dufflepod | Do the initial massage with Ida a couple of days ago. Now doing all the commenting, labelling, etc etc etc by hand. |
| 02:47.38 | Dufflepod | Ye Gods there's some strange code out there in the wild ! |
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| 02:50.23 | MonMotha | heh |
| 02:50.27 | MonMotha | yes there is |
| 02:50.31 | Dufflepod | lol |
| 02:50.40 | MonMotha | doesn't help that you're looking at it all thought the eyes of an optimizing compiler |
| 02:50.44 | MonMotha | what arch? |
| 02:51.02 | MonMotha | MIPS is always annoying because it gets hard to track immediate loads |
| 02:51.09 | MonMotha | due to lui/andi being used |
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| 02:51.31 | MonMotha | er lui/addi or lui/ori |
| 02:51.41 | Dufflepod | ARM9 - It's a reset bootstrap, so you'd expect it to be mostly written by hand, but there's definately the dark touch of a compiler about it. |
| 02:51.58 | MonMotha | eh, I've seen plenty of boot code written in C |
| 02:52.12 | Dufflepod | Haven't done MIPS stuff - I value my sanity ;-) |
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| 02:52.21 | MonMotha | you need surprisingly little assembly to get things started. Just enough to set up memory (stack, BSS, etc.) |
| 02:53.12 | MonMotha | for example, on AVR, the C library includes a small bootstrap that sets stuff up and drops you into main. Most people never have to hack on that and just start their code right up in main (sometimes banging on a few registers early in .initN) |
| 02:53.17 | Dufflepod | There's a heap of what looks like production test code in there, probably for ATE equipment. Some of that is just wierd. |
| 02:53.37 | MonMotha | well, that may be library code not even built by the same compiler as the rest of the binary |
| 02:54.43 | Dufflepod | This is a bit earlier on. H/W & RAM setup, flash ECC validation, optional selftest, then jump off to give embedded *nix a kick |
| 02:57.22 | Dufflepod | And with that thought I think I can feel a cigarette coming on, followed by a Battlefield 2 session. |
| 02:57.51 | Dufflepod | What else is there to do at 3 o' clock in the morning. :-) |
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| 14:43.12 | jimmy06 | hey guys any one about ? :) |
| 14:43.38 | Dufflepod | One or two folks :-) |
| 14:44.05 | jimmy06 | woundering if anyone would be able to help a little with busybox :) |
| 14:44.29 | Dufflepod | Give it a go |
| 14:44.47 | jimmy06 | its to do with the usepeerdns option |
| 14:45.03 | jimmy06 | and udhcpd |
| 14:45.24 | Dufflepod | I'm drawing a complete blank on that. You'd better pray there's someone else in here. |
| 14:45.41 | jimmy06 | lol |
| 14:45.41 | jimmy06 | ok |
| 14:46.53 | jimmy06 | ty any way |
| 14:47.03 | Dufflepod | :-) |
| 14:48.52 | jimmy06 | to be honest it only get more confusing as its reguards a Belkin N1 Vision router lol |
| 14:49.45 | Dufflepod | Are you building a busybox for the router? |
| 14:49.53 | jimmy06 | the router uses busybox lol |
| 14:50.06 | Dufflepod | ok |
| 14:51.00 | jimmy06 | it seems alot of routers do nowadays |
| 14:51.09 | jimmy06 | i see some netgear stuff with it as well |
| 14:51.22 | Dufflepod | Doesn't surprise me |
| 14:51.47 | jimmy06 | i think thats why where seeing GPL source code for them as well |
| 14:52.08 | Dufflepod | Makes sense |
| 14:54.31 | jimmy06 | N1 vision has one annoying "feature" when you try to use OpenDNS it gets the idear that setting dhcp options for clients dns is a good idear. So i end up with clients having 192.168.2.1(router) and then two others being open dns entries lol |
| 14:55.16 | jimmy06 | well not just openDNS but any static DNS |
| 14:55.43 | Dufflepod | Search me |
| 14:56.56 | jimmy06 | i had to hack the thing just to get telnet working lol |
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| 16:20.37 | *** join/#edev nicely (n=chatzill@c-71-62-5-15.hsd1.va.comcast.net) |
| 16:22.48 | nicely | does anybody have any suggestions for someone looking to begin learning ARM like beginners dev boards or uc's to begin with? |
| 16:24.16 | Dufflepod | These guys are cheap & cheerful: http://www.embeddedartists.com/products/ |
| 16:25.39 | nicely | sweet thanks |
| 16:25.51 | nicely | know of anything from atmel? |
| 16:26.18 | Dufflepod | Sorry, no. |
| 16:26.22 | L_Deluxe | Olimex has some boards based on the Atmel SAM7 series. |
| 16:26.33 | L_Deluxe | And pricier ones based on SAM9, I think. |
| 16:27.00 | nicely | ok well one question |
| 16:27.06 | nicely | if I get an ARM chip from atmel |
| 16:27.13 | nicely | and then later decide to get one from NXP |
| 16:27.26 | nicely | that are 'based' off the same arm7 chip for example |
| 16:27.39 | nicely | whats the big difference |
| 16:27.47 | L_Deluxe | Pinout and peripherals. |
| 16:28.00 | nicely | but thats about it right |
| 16:28.01 | L_Deluxe | Only the actual ARM core is the same. |
| 16:28.13 | L_Deluxe | That's pretty major. |
| 16:28.37 | L_Deluxe | Stuff like the interrupt controller is completely different. Memory mapping. Clock generation. Etc. |
| 16:29.04 | nicely | oh |
| 16:29.05 | nicely | cool |
| 16:29.09 | nicely | thats ok i guess |
| 16:29.20 | nicely | sounds like once you pick a chip you're not swapping it for another very easily |
| 16:30.14 | L_Deluxe | Not unless you write stuff that is so modular that you can just swap out the startup code and peripheral access library(ies). |
| 16:31.21 | nicely | yeah sounds like itd be a lot of work |
| 16:31.28 | nicely | i guess theres not really a point just wonderin |
| 16:32.14 | L_Deluxe | It'd be about like switching from PIC to AVR except that the processor core is the same. |
| 16:32.29 | nicely | oh ok |
| 16:32.44 | nicely | that makes sense cause ive worked some with both of those |
| 16:33.08 | L_Deluxe | Good. That makes the analogy work. ;) |
| 16:35.03 | nicely | do you know off the top of your head if there are arm breakout boards or if those are bad idea |
| 16:35.22 | nicely | cause i think itd be cool to breadboard one up just to learn basics and worry about external peripherals later |
| 16:37.01 | L_Deluxe | http://www.sparkfun.com/commerce/categories.php?c=94 |
| 16:37.22 | L_Deluxe | Dev boards. Header boards (the breakout you requested). Etc. |
| 16:38.30 | nicely | cool man thanks |
| 16:38.34 | nicely | thats kinda what im lookin for |
| 16:38.51 | L_Deluxe | Cool. |
| 16:39.34 | L_Deluxe | There are surely others, but I've worked personally with the H-64. |
| 16:41.00 | L_Deluxe | Which is apparently now called DEV-00614. I'd spring for the 256k version if you want to run code of any size out of RAM. |
| 16:41.01 | nicely | how much do the dev tools usually run |
| 16:41.16 | L_Deluxe | Software? GNU toolchain. |
| 16:41.16 | nicely | like for the header board is it just usb connectable and all you need is the software? |
| 16:41.32 | nicely | or do you need a seperate programmer |
| 16:41.51 | L_Deluxe | The SAM7 boards are USB connected. You use a tool called SAM-BA to load/run code. If you want debugging too, they also have a JTAG header. |
| 16:42.10 | L_Deluxe | And could use that to load code instead of SAM-BA if you want. |
| 16:42.25 | L_Deluxe | I don't know about the SAM9 boards. |
| 16:43.08 | nicely | ice |
| 16:43.10 | nicely | nice |
| 16:43.12 | nicely | thanks |
| 16:43.18 | L_Deluxe | You're welcome. |
| 16:44.36 | L_Deluxe | If you're not attached to Atmel, there are Cortex M3 controllers out now. ST has a seemingly popular one. And, of course Luminary. Atmel has stated plans to come out with their own. |
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| 16:45.28 | L_Deluxe | And moving from ARM7TDMI to Cortex M3 is a big change in the same way that moving to SAM7 to LPC is, for instance. |
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| 19:48.38 | ds2 | anyone know why a buckboost charge pump (pump + LDO + logic) does so bad when Vin == Vout? eff. drops to almost 60-55% |
| 19:56.56 | Crofton | likely has to buck and boost to regulate output ... |
| 19:57.16 | ds2 | as in thrashing? |
| 19:57.32 | Crofton | yeah |
| 19:57.36 | Crofton | wild guess though |
| 19:57.41 | ds2 | good as any |
| 19:58.05 | Crofton | eff is good when the volts are not equal? |
| 19:58.19 | ds2 | yes, it peaks at about 3.9V |
| 19:58.27 | ds2 | (5V out, 1.8-5.5V in) |
| 20:00.04 | ds2 | the charge pump got hotter then I expected which prompt a look at the datasheet... it seems I am better off sticking a series diode to make it more efficient :/ |
| 20:55.36 | davidc__ | ds2: perhaps its the dropout of the LDO? |
| 20:55.50 | davidc__ | [contributing, that is] |
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| 21:11.54 | ds2 | davidc__: Hmm |
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| 21:39.08 | davidc__ | ds2: got a link to the datasheet? |
| 21:39.20 | davidc__ | ds2: also; does the efficiency go back up as it switches into boost? |
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| 21:42.55 | ds2 | one sec |
| 21:46.44 | ds2 | http://www.ti.com/lit/gpn/tps60130 |
| 21:46.54 | ds2 | that's the part and link to the datasheet |
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| 22:03.41 | drasko | (gdb) target sim |
| 22:03.41 | drasko | Undefined target command: "sim". Try "help target". |
| 22:03.46 | drasko | Any ideas? |
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| 22:37.54 | jimmy006 | any one in here know anything about udhcpd ? |
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| 23:03.21 | florian | jimmy006: I know its a little bit buggy... |
| 23:03.26 | florian | :) |
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