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| 02:23.23 | nicely | when im performing A2D on a PIC18, the data sheet recommends going into a sleep mode when using clock speeds over 1mhz |
| 02:23.24 | nicely | anyone have any experience with this? |
| 02:24.29 | MonMotha | I've not done that on a PIC, but I've done that on AVR |
| 02:24.43 | MonMotha | it can improve accuracy due to coupled noise some |
| 02:24.56 | MonMotha | a good layout can pretty much eliminate the need |
| 02:25.09 | nicely | hmm |
| 02:25.18 | nicely | i get some glitches |
| 02:25.23 | nicely | but i think its cause of something else |
| 02:25.42 | nicely | its a 10 bit ADC |
| 02:25.50 | nicely | and i shift it down 2 so its 8 bit |
| 02:26.05 | MonMotha | the idea behind going into sleep mode while doing an ADC conversion is that one of the biggest sources of unwanted coupling is the CPU clock onto the A/D input |
| 02:26.07 | nicely | for easier transmission over uart |
| 02:26.16 | nicely | hmm |
| 02:26.17 | MonMotha | if you go into sleep mode, you can stop the CPU clock |
| 02:26.39 | nicely | thats what i thought but i dont understand the glitch i get |
| 02:26.47 | nicely | basically, i can get a full range of values 0-255 |
| 02:27.01 | nicely | but often times, the value gets 'stuck' if you will around 127 |
| 02:27.03 | nicely | and 255 |
| 02:28.17 | MonMotha | tough to give a cause without more information about the application |
| 02:30.55 | nicely | im reading from an accelerometer |
| 02:31.04 | nicely | right now im testing with a trim pot |
| 02:31.38 | nicely | and for some reason, the voltage value being read in by the a2d unit will stick at 127 |
| 02:31.41 | nicely | and 255 |
| 02:31.50 | nicely | like i said |
| 02:31.53 | nicely | the a2d unit is 10 bits |
| 02:32.00 | nicely | and i only need the 8 MSB |
| 02:32.04 | nicely | so i shift it twice to the right |
| 02:32.08 | nicely | value>>@ |
| 02:32.11 | nicely | >>2* |
| 02:33.38 | MonMotha | sure |
| 02:33.50 | MonMotha | it sounds like your pot is just weird |
| 02:33.51 | nicely | so for example |
| 02:33.56 | nicely | nah mang |
| 02:33.57 | MonMotha | perhaps it has a center detent |
| 02:34.08 | nicely | ive tested it with tohers |
| 02:34.23 | MonMotha | ok, then I'm not sure what to say |
| 02:34.30 | MonMotha | that's not really consistent with clock coupling |
| 02:34.49 | MonMotha | clock coupling pretty much just looks like narrowband noise around the frequency of the clock |
| 02:34.51 | nicely | yeah im pretty stumped |
| 02:38.06 | nicely | the only issue i would have is waking up from sleep |
| 02:38.22 | nicely | pretty much any interrupt will wake it up im guessing right |
| 02:38.43 | MonMotha | usually, one leaves an async timer running for a wake up source |
| 02:38.54 | MonMotha | unless one really doesn't need to do anything until another external interrupt |
| 02:41.20 | nicely | i dont need to be awake until interrupts |
| 02:46.03 | MonMotha | I don't know what the wake-up criteria is on PIC |
| 02:46.15 | MonMotha | I mostly do AVR and 8051 for my small stuff |
| 02:46.31 | MonMotha | I have something of a dislike for PIC's development tools (and the architecture is none-too-fresh also) |
| 02:47.09 | nicely | yeah i prefer avr i have to use PIC for a project |
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| 15:07.57 | kergoth | morning |
| 15:08.09 | prpplague | kergoth: greetings earthling |
| 15:08.41 | g1powermac_PB | heya prpplague |
| 15:08.48 | prpplague | g1powermac_PB: hey bud |
| 15:09.08 | g1powermac_PB | has finally gotten back into doing some electronics/programming stuff |
| 15:09.54 | g1powermac_PB | I really want to get my hands on one of these: http://www.enterpoint.co.uk/component_replacements/craignell2.html |
| 15:09.59 | g1powermac_PB | though they're a bit too much atm |
| 15:10.28 | keesj | can I do simple math in makefiles? |
| 15:15.13 | Dufflepod | keesj: http://www.gnu.org/software/make/manual/ |
| 15:16.43 | keesj | perhals the shell function but I don't really like that |
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| 15:21.23 | keesj | ok its simply $$(( 2 + 2 )) |
| 15:24.17 | Dufflepod | Yep - that syntax works for me |
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| 15:27.14 | prpplague | g1powermac_PB: i purchased a couple of the old rz1710 ipaqs very cheap($35), gonna look and see if can make them into a dev platform |
| 15:27.21 | prpplague | g1powermac_PB: plenty of them on ebay for cheap |
| 15:28.35 | g1powermac_PB | nice |
| 15:28.55 | g1powermac_PB | you know whats sad? the zipits are down to that price on amazon |
| 15:29.03 | g1powermac_PB | and I paid like $100 or so for it :> |
| 15:29.25 | prpplague | g1powermac_PB: yea they screwed themselves on trying to make everyone sign those agreements |
| 15:29.35 | g1powermac_PB | yea |
| 15:30.09 | g1powermac_PB | do they still got that agreement thing? I haven't been keeping up with it due to having to do lots of other stuff lately |
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| 16:06.05 | g1powermac_PB | prpplague: I was wondering, could I hook the two lithium batteries I bought from in series to double the voltage yet still charge it with the same charger? |
| 16:06.40 | prpplague | g1powermac_PB: generally no, not in series |
| 16:11.34 | Dufflepod | prpplague: Have you had a chance to check if you can let me have that info on the barracuda board? |
| 16:12.09 | prpplague | Dufflepod: sorry no, i'll send off a message now |
| 16:12.33 | Dufflepod | That's great - appreciate it. |
| 16:13.54 | g1powermac_PB | ahh, k |
| 16:14.07 | g1powermac_PB | bbiab |
| 16:38.47 | prpplague | Dufflepod: ping |
| 16:38.54 | Dufflepod | pong |
| 16:40.34 | CosmicPenguin | When did I become a coding style dick? |
| 16:40.58 | CosmicPenguin | I just saw a function declaration with () instead void, and it make me angry |
| 16:41.10 | kergoth | hehe |
| 16:41.21 | Dufflepod | lol |
| 16:41.57 | prpplague | Dufflepod: doc will be cleared for posting on monday or tuesday |
| 16:42.04 | CosmicPenguin | damn kids these days, anyway |
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| 16:42.14 | prpplague | Dufflepod: i'm creating a wiki page at elinux for the info, feel free to add to it |
| 16:42.23 | CosmicPenguin | indent 8 spaces, and get of my lawn |
| 16:42.33 | Dufflepod | You sir, are a star. That should take a fair bit of pain out of what I'm doing. Thanks. |
| 16:42.34 | prpplague | jokes with CosmicPenguin |
| 16:42.40 | prpplague | CosmicPenguin: i thought you were always one |
| 16:43.05 | CosmicPenguin | yeah, but the coding style bit is new |
| 16:43.42 | g1powermac | heh, guess CosmicPenguin wouldn't like my maniacal use of bitwise operators in C. . . |
| 16:43.46 | Dufflepod | CosmicPenguin: Next you'll be calling <TAB>s an abomination and setting the dogs on anyone who uses them. |
| 16:44.17 | g1powermac | where I could have easily expressed the same thing with a simple if statement or something and made it more readable |
| 16:45.03 | prpplague | Dufflepod: http://elinux.org/Reciva_Barracuda |
| 16:45.41 | CosmicPenguin | Its BSD style ! Release the hounds! |
| 16:45.58 | Dufflepod | Thanks prpplague. I'll have a look. |
| 16:46.49 | g1powermac | hehe |
| 16:47.39 | prpplague | Dufflepod: http://sharpfin.zevv.nl/index.php/Hardware |
| 16:48.37 | Dufflepod | Yeah - I've seen around the sharpfin wiki. I must update that too with the testmode info gleaned from the bootflash. |
| 16:49.14 | prpplague | Dufflepod: i don't think there is much more info in that datasheet |
| 16:49.26 | Dufflepod | I've asked those guys though if they thought it was OK me uploading the code, sopyright issues etc, so I haven't bothered yet. |
| 16:49.29 | prpplague | mostly pinouts, but phil said he'd see what all he could provide |
| 16:49.42 | Dufflepod | Every little helps. |
| 16:55.10 | prpplague | CosmicPenguin: question, tasklets are the same as workqueues with respect to the fact that if the tasklet is already schedule when a second call to schedule is made it will be refused since it is already schedule, is that correct? |
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| 17:05.28 | CosmicPenguin | prpplague: I believe so, es |
| 17:05.29 | CosmicPenguin | yes |
| 17:06.03 | prpplague | CosmicPenguin: okie dokie thanks, i'll do a little test module to confirm |
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| 17:10.52 | prpplague | CosmicPenguin: am i the only one that has a test-me.c app and a test-me.c kernel module, where i can do small programming tests? or do you something similar? |
| 17:11.26 | CosmicPenguin | I have test.<blah> in my home directory in a wide variety of languages |
| 17:14.42 | prpplague | CosmicPenguin: ahh |
| 17:15.19 | prpplague | lordy lordy |
| 17:15.26 | prpplague | has to stop reading the news |
| 17:15.34 | prpplague | it's all going to hell |
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| 17:29.56 | solar | Anybody seen/know if you have noticable results in embedded using the deadline scheduler over the cfq one? |
| 17:34.37 | prpplague | solar: you might try the elinux wiki, the CELF guys have alot of comparison charts there |
| 17:35.24 | menomc | hi prpplague! do yu have a tracking number for me? :) |
| 17:36.09 | prpplague | menomc: sorry not at this exact momment, got a deadline today, i'll try to get it to you before EOD, or else i'll email it to you |
| 17:36.35 | menomc | prpplague: np, I can bother you again on monday :p |
| 17:36.44 | prpplague | :P |
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| 19:22.06 | Mirell | d: :P |
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| 21:47.43 | solar | the beagleboard only does networking via the usb interface? |
| 21:51.17 | roxfan | afaik it doesn't have ethernet |
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| 22:37.08 | florian | solar: you could use an ssp ethernet chip, but that would involve some pcb design |
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| 23:07.19 | solar | florian: yeah don't have one yet. |
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| 23:37.19 | solar | Anybody going to ESC in SJC this year? |
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