| 00:12.29 | *** join/#edev pingbat (~pingbat@188-220-33-191.zone11.bethere.co.uk) |
| 00:13.30 | pingbat | hey, anyone ever used an analogue mux? |
| 00:17.01 | pingbat | is it fairly standard to use one before an amplifier? |
| 00:35.51 | T0mW | pingbat: like a 4066 ? |
| 00:36.28 | pingbat | yup |
| 00:36.37 | T0mW | yeah, common usage. |
| 00:37.08 | pingbat | so no voltage bias or anything pesky like that? |
| 00:37.20 | T0mW | watch out for the channel isolation spec. It will be in DB, be aware that sound / signals on adjacent channels can bleed over. |
| 00:37.52 | pingbat | i am guessing that this crosstalk will be proportional to voltage |
| 00:38.10 | wmat | ~seen prpplague |
| 00:38.12 | purl | prpplague <~danders@nat/ti/x-zvflpvvsneccnmmc> was last seen on IRC in channel #hawkboard, 2d 5h 31m ago, saying: 'eh gads , i found the gerbers, but they are a mess'. |
| 00:38.14 | pingbat | i'm looking at 100s of µV |
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| 00:38.37 | T0mW | pingbat: depends on the signal you are feeding into it. If the signal input & output levels are above GND, then you only need a posittive supply. However, if the input is AC coupled (cap), you need a differential supply to the mux. |
| 00:40.00 | T0mW | pingbat: I think that the isolation (crosstalk) will be spec'ed as either DbV or DbM. |
| 00:41.55 | T0mW | Of course, you can avoid the whole isolation issue by using multiple stages of input switches, separate switch packages, etc. Be careful of the series resistance (IIRC, about 60ohms). |
| 00:43.18 | T0mW | ping my yamaha receiver / amp bleeds the FM radio signal into the CD input that I use for mythtv. If you crank the volume up high enough, you can faintly hear the radio station. |
| 00:43.35 | pingbat | resistance looks more like 250Ω for my voltake range |
| 00:43.47 | T0mW | that is for what device? |
| 00:44.07 | pingbat | Fairchild CD4066BC |
| 00:44.21 | pingbat | i'll have a poke around |
| 00:45.08 | T0mW | try looking on digikey for analog muxes, that should let you drill down into some better devices perhaps. The CD4066 is really ancient CMOS. |
| 00:45.17 | pingbat | i was hoping to filter everything digitally |
| 00:45.54 | T0mW | You still could, just that I think there are better muxes available in something other than CMOS. |
| 00:46.11 | pingbat | do you know how your yamaha is set up inside? |
| 00:46.17 | T0mW | naw |
| 00:47.00 | T0mW | I got enough problems getting this ARM controller doing what I need it to do, the yamaha is "good enough" for now. heh |
| 00:47.14 | pingbat | which ARM? |
| 00:47.30 | T0mW | s3c2440 |
| 00:48.20 | T0mW | pingbat: hey, you can always go with magnetic reed switches: microOhms and totally isolated! |
| 00:49.15 | pingbat | i was thinking kHz, not sure the reed switches would like that |
| 00:49.30 | pingbat | i think that 200Ω will be fine |
| 00:49.48 | T0mW | I assumed you were merely gating audio. |
| 00:49.51 | T0mW | k |
| 00:50.14 | T0mW | pingbat: alternative might be to use a codec? |
| 00:50.24 | pingbat | nah |
| 00:50.44 | pingbat | looking at using the ADC on a micro |
| 00:51.09 | T0mW | ok, back to my paperback |
| 00:51.17 | pingbat | it's all just a twinkle in my eye right now though |
| 00:51.34 | pingbat | enjoy, thanks for the help :-) |
| 00:51.42 | T0mW | np |
| 00:52.04 | pingbat | try "Gentlemen Of The Road" fun short novel |
| 00:52.57 | T0mW | David Eddings: "King of the Murgos" |
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| 00:56.33 | kergoth | finds those two of eddings series to be a bit too cheerful, though good.. the sparhawk books are slightly more gritty :) |
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| 14:22.58 | kergoth_ | morning |
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| 14:40.56 | Mirell | Morning. |
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| 15:22.46 | prpplague | wmat: you are celf? |
| 15:23.01 | CosmicPenguin | I am spartaaaa |
| 15:27.58 | prpplague | CosmicPenguin: funny |
| 15:28.56 | prpplague | CosmicPenguin: hows things? |
| 15:30.10 | CosmicPenguin | ssdd |
| 15:33.04 | prpplague | dandy |
| 15:33.33 | prpplague | CosmicPenguin: someone was talking about getting pixil up and running on the didj the other day |
| 15:33.40 | CosmicPenguin | heh |
| 15:33.56 | CosmicPenguin | We must locate that poor individual and get them the mental help they need |
| 15:35.30 | prpplague | hehe |
| 15:37.38 | prpplague | CosmicPenguin: does qualcomm promote a dev platform for the snapdragon? |
| 15:37.58 | CosmicPenguin | not for normal folks |
| 15:38.17 | prpplague | CosmicPenguin: right, i mean do they put out any PR and such about it? |
| 15:38.31 | CosmicPenguin | no |
| 15:39.06 | CosmicPenguin | We are not at all helpful in that regard |
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| 15:42.54 | prpplague | CosmicPenguin: ahh ok |
| 15:43.02 | prpplague | CosmicPenguin: i was googling around and didn't see anything |
| 15:43.32 | CosmicPenguin | we are classic corporate in that regard |
| 15:44.02 | CosmicPenguin | In the 'bring a million units to the table or we're not even going to admit you exist" sort of way |
| 15:44.19 | prpplague | CosmicPenguin: yea, TI's WBU division is similar |
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| 15:44.26 | prpplague | CosmicPenguin: they are working on that though |
| 15:45.05 | CosmicPenguin | The way I see it, and the way I think the executives see it is that since we use ARM, our only possible value add is the cell modem |
| 15:45.11 | CosmicPenguin | and thats not something we would share anyway, so why bother? |
| 15:45.53 | prpplague | CosmicPenguin: indeed |
| 15:45.57 | CosmicPenguin | I would like to see more people with eyes on our GPU, but I'm biased |
| 15:47.41 | prpplague | CosmicPenguin: i'm having trouble getting used to all the secrecy |
| 15:47.58 | CosmicPenguin | You should never get used to it |
| 15:48.01 | CosmicPenguin | you should just suffer it |
| 15:48.05 | CosmicPenguin | that way, you don't lose perspective |
| 15:48.24 | prpplague | indeed |
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| 16:03.08 | Mirell | Mmm... |
| 16:03.13 | Mirell | can't wait for the KFC Double Down |
| 16:05.36 | prpplague | Mirell: hehe |
| 16:13.23 | prpplague | Mirell: know any android devr's looking for work? |
| 16:14.21 | Mirell | prpplague: Nope |
| 16:14.51 | prpplague | Mirell: i'm gonna be in austin the week of 9/18 , we'll have to meet up |
| 16:15.00 | Mirell | That's quite a ways in the future |
| 16:15.17 | prpplague | Mirell: old friends wedding |
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| 16:18.43 | Mirell | Ahh |
| 16:19.54 | Mirell | is reading the LPR protocol... |
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| 17:32.26 | prpplague | T0mW: hey bud |
| 17:32.39 | T0mW | prpplague: hey, wassup |
| 17:32.48 | prpplague | T0mW: ssdd |
| 17:32.54 | T0mW | LOL |
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| 17:40.16 | T0mW | prpplague: on another note... |
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| 17:41.00 | T0mW | prpplague: I'm about to dive into kernel code to see how I can get an interrupt bottom half to process within a user app. |
| 17:41.41 | T0mW | I think that there is some library for that... Anyhow, that is what my day is going to be. |
| 17:42.10 | prpplague | T0mW: ahh interesting |
| 17:42.24 | prpplague | T0mW: you find a solution and get an example, i'd be interested in seeing it |
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| 17:47.21 | T0mW | prpplague: I know that I saw that as a config option in one of the later kernels. |
| 17:50.00 | wmat | prpplague: what's up? |
| 17:50.24 | prpplague | wmat: hey |
| 17:50.36 | wmat | waves from EMC |
| 17:50.41 | wmat | oops, ELC |
| 17:50.47 | prpplague | wmat: was needing some info on CELF last friday, got in touch with TimB instead |
| 17:51.14 | wmat | cool, I was at my son's hockey tournament and basically offline |
| 17:52.43 | T0mW | prpplague: CONFIG_UIO_PDRV_GENIRQ |
| 17:52.59 | prpplague | T0mW: ahh dandy |
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| 17:53.24 | T0mW | prpplague: not sure though, my idea of user space and the kernels may differ... |
| 17:55.24 | prpplague | T0mW: what are you trying to do from user space? |
| 17:56.25 | T0mW | prpplague: well, I have hardware that I'm presently accessing from a PATA port (16bit). The interrupt of that system is tied to the PATA IRQ. ok? |
| 17:56.49 | prpplague | ok |
| 17:57.04 | T0mW | prpplague: So, when the target hardware asserts the PATA IRQ, I need my app to respond with an interrupt handler (not in kernel space). |
| 17:57.30 | prpplague | T0mW: what are the time constraints? |
| 17:57.51 | T0mW | I would think that would be possible if the kernel checks the validity of the registered user space app to ensure it is still active. |
| 17:59.06 | prpplague | T0mW: well, i personally wouldn't handle it as an IRQ from the userspace |
| 17:59.22 | T0mW | prpplague: 150HZ =~ what, 6.6ms repititon rate. |
| 17:59.28 | prpplague | T0mW: i'd have a char device node that i could open up and monitor for data |
| 17:59.51 | prpplague | T0mW: use a select with a timeout |
| 18:00.18 | T0mW | prpplague: problem is that this app is not constructed that way (huge code). |
| 18:01.07 | prpplague | T0mW: i'm guessing you are retro fitting some app with newer hardware? |
| 18:01.14 | T0mW | prpplague: I'll figure something out about the timing. One item that needs precise timing could maybe have the kernel note the time of the event and queue it for later retreival. |
| 18:02.27 | T0mW | prpplague: But, I will still need to asynchronously interrupt the application by some method. Hmmm, maybe make this thing threaded for the interrupt stuff... |
| 18:02.49 | T0mW | run a background thread, and maybe a fifo. |
| 18:03.12 | T0mW | prpplague: yeah, yeah, then use the select, thanks. |
| 18:04.07 | prpplague | T0mW: doing an irq from user space is doable, but i think you;d be better off using more conventional techniques for "triggered" operations |
| 18:04.17 | T0mW | prpplague: fun part was using the IDE cable to control latches for the data / address / control signals and run the hardware via the computer. |
| 18:04.59 | prpplague | T0mW: yea, i was reading over some techniques for adding SATA to arm SoC's the other day |
| 18:05.01 | T0mW | prpplague: they have a large hardware investment that I have to be able to support, so, that is why I have to "bang the bus" |
| 18:05.15 | prpplague | T0mW: i figured as much |
| 18:06.12 | T0mW | prpplague: although the code tends to do a lot of hardware polling instead of interrupt based I/O, most of the code is just looping waiting for something to trigger. |
| 18:06.56 | prpplague | T0mW: ahh |
| 18:07.24 | T0mW | When an event occurs, it runs through building info in arrays / queues. That code runs without performance limitations. The hardware polling has to bitbang to allow for the slow speed of the backplane. |
| 18:08.28 | T0mW | prpplague: hey, interesting tricks you can play with OVERLAY in linker scripts and then objcopy to remove the initialzation sections of those overlays... |
| 18:08.53 | T0mW | first go around I had a 100+Meg executable. |
| 18:08.59 | prpplague | interesting |
| 18:09.07 | T0mW | objcopy reduced that down to < 6Meg |
| 18:09.33 | T0mW | this target code used memory banking, but the banks were just RAM. |
| 18:10.48 | T0mW | prpplague: this is that project where I had tons (130K lines) of 8bit assembler to run on a 32bit ARM? |
| 18:12.23 | prpplague | T0mW: ahh |
| 18:13.12 | T0mW | prpplague: all that has been done, dealing with arch issues now. |
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| 18:13.54 | T0mW | prpplague: I still have no idea if it is going to work or if the customer is going to have to sue me. heh. |
| 18:14.12 | T0mW | prpplague: it *will* run though. :P |
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| 18:15.06 | T0mW | prpplague: SATA? Going to bitbang it? |
| 18:15.54 | prpplague | T0mW: naw, using PATA->SATA bridge |
| 18:16.03 | T0mW | ah |
| 18:16.15 | T0mW | prpplague: coward |
| 18:16.19 | prpplague | T0mW: hehe |
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