| 01:02.19 | *** join/#openjtag mithro (n=tim@c213-100-42-188.swipnet.se) |
| 01:02.23 | mithro | hey |
| 01:02.31 | [g2] | welcome |
| 01:03.02 | [g2] | ep1220 is just finishing up a JTAG board |
| 01:03.23 | [g2] | so an 8 line USB FXS adapter eh ? |
| 01:03.39 | *** join/#openjtag ka6sox (n=ka6sox@nslu2-linux/ka6sox) |
| 01:03.39 | [g2] | FXS is customer phone line right ? |
| 01:03.54 | mithro | the internal, house side |
| 01:04.11 | [g2] | right |
| 01:04.43 | [g2] | so 8 RJ11s |
| 01:05.12 | mithro | yeah |
| 01:05.25 | [g2] | lemme guess asterisk in a box |
| 01:05.39 | mithro | it's nothing more then a glorified DAC with some extra stuff for ringing |
| 01:06.23 | mithro | asterisk box does all the hard work |
| 01:06.39 | [g2] | I would think a cheap DSP handle the 8 lines no ? |
| 01:07.10 | mithro | it's based around a PIC device |
| 01:07.23 | [g2] | ah 8 PICs ? |
| 01:07.59 | [g2] | are you just thinking usb 1.1 and that's way the 8 limit ? |
| 01:08.35 | mithro | no 1 PIC with 8 inbuilt ADC and an external SPI connected DAC |
| 01:08.49 | mithro | the 8 way limit is because I ran out of ports on the PIC |
| 01:10.23 | [g2] | so are the usb side are you running isochronous data ? |
| 01:10.42 | [g2] | and interrupts ? |
| 01:11.49 | mithro | it uses 8 intersil SLICs with a PIC 18F4455 |
| 01:12.26 | mithro | i've yet to actually produce a physical board - but the interface should be very simple in theory |
| 01:12.46 | ka6sox | I have an 18F4455 I was looking to use somewhere :) |
| 01:12.54 | [g2] | how easy are the SLICs to get ahold of ? |
| 01:12.56 | [g2] | hey ka6sox |
| 01:13.07 | [g2] | mithro is interested in doing open hardware |
| 01:13.13 | mithro | 18F4455s are very cool |
| 01:13.13 | ka6sox | excellent! |
| 01:13.22 | mithro | the inbuilt USB is really handy |
| 01:13.45 | ka6sox | I have 3 samples and looking to use it for a SCADA application |
| 01:13.57 | ka6sox | [g2], cool..thats a nice thing. |
| 01:14.23 | mithro | basically i'm after doing something a bit simpler before i actually try and get out this other device |
| 01:14.32 | [g2] | mithro ka6sox builds boards |
| 01:15.17 | ka6sox | okay I saw talk about what looks like a device for Asterisk |
| 01:15.35 | mithro | ka6sox: want me to start from the beginning? |
| 01:15.59 | ka6sox | ya...sounds interesting from what I saw :) |
| 01:16.46 | mithro | okay - i decided that FXS devices are too expensive |
| 01:17.01 | ka6sox | yep |
| 01:17.06 | mithro | so I wanted a cheap replacement |
| 01:17.52 | [g2] | mithro is this for asterisk ? |
| 01:18.15 | mithro | hence i designed a 8 line FXS USB device which should be able to be built for under $50 US |
| 01:18.21 | ka6sox | excellent |
| 01:18.26 | mithro | however i have never done hardware before |
| 01:18.49 | ka6sox | [g2], we could use this on a SLUG....excellent |
| 01:19.02 | mithro | so I'm bound to have made quite a few "beginner" mistakes |
| 01:19.02 | [g2] | ka6sox or a loft :) |
| 01:19.19 | ka6sox | do you have design tools (EDA stuffs)? |
| 01:19.40 | mithro | the device is pretty underpowered - most of the processing has to be done by Asterisk |
| 01:20.01 | ka6sox | mithro, its only going to be a USB A/D D/A converter |
| 01:20.26 | mithro | ka6sox: basically a glorified USB A/D D/A |
| 01:20.29 | ka6sox | yep |
| 01:20.39 | ka6sox | cost. |
| 01:20.47 | mithro | [g2]: programming expertise |
| 01:20.54 | ka6sox | his goal is <$50 |
| 01:20.56 | [g2] | hey they were only $5 years ago |
| 01:21.09 | mithro | i could use a TI DSP which would cost only a little more then the PIC |
| 01:21.16 | ka6sox | but its all the glue and other stuffs that drives cost. |
| 01:21.25 | mithro | but i hate DSP programming, no free tools |
| 01:21.31 | [g2] | most of the DSPs support glueless |
| 01:22.02 | mithro | glueless? |
| 01:22.18 | mithro | i'm more comfortable with PICs personally |
| 01:22.33 | ka6sox | there are some Pic DSP devices. |
| 01:22.54 | ka6sox | (co processor like devices) |
| 01:23.24 | mithro | yeah |
| 01:23.39 | mithro | start with a PIC - replace with a DSP at a later date |
| 01:24.09 | [g2] | I know a guy that's been doing dsp stuff forever |
| 01:24.17 | ka6sox | most sample rates are up around 8khz (64kb sample rate) |
| 01:24.36 | mithro | in fact the TI DSP removes the requirement for most of the chips |
| 01:24.41 | mithro | but they are impossible to hand solder |
| 01:25.06 | ka6sox | yep |
| 01:25.13 | mithro | so... |
| 01:25.23 | mithro | basically i need a simple project to get my feet wet |
| 01:25.27 | [g2] | well most things are smt right ? |
| 01:25.37 | mithro | [g2]: yeah everything is SMT |
| 01:25.53 | mithro | through hole stuff takes up to much space |
| 01:26.27 | mithro | plus goes through the board making it hard to trace stuff with only two sides |
| 01:26.35 | [g2] | I think there's a place that does boards for $5 a square inch on the first run |
| 01:27.05 | [g2] | I've heard they do it for $2.50 of you know what your doing after a run or two |
| 01:27.14 | mithro | cheapest i've seen is $33 boards |
| 01:27.37 | [g2] | I'd imagine this would be a small board |
| 01:28.15 | mithro | [g2]: do you have Cadsoft eagle? |
| 01:28.48 | [g2] | no I don't... I'm not doing a lot of layout yet, but that'll be next |
| 01:29.33 | mithro | i can send you the prototype PCB layout if you wanted to have a look see |
| 01:29.35 | [g2] | I'd like to do a couple small boards first before a full system board |
| 01:30.51 | [g2] | mithro I think there's the design and then the layout |
| 01:31.06 | mithro | hrm? |
| 01:31.55 | mithro | the current board size is "100 x 80 mm (4 x 3.2 inches)" |
| 01:32.48 | mithro | so... |
| 01:32.48 | [g2] | would you need to go 8 ports out of the box ? |
| 01:32.53 | ka6sox | thats fairly significant |
| 01:32.58 | [g2] | what about 2 |
| 01:33.00 | ka6sox | 100X80mm |
| 01:33.28 | mithro | the SLIC chips are pretty big and I need 8 off em |
| 01:33.34 | [g2] | right the ixp42x board is 4x6 |
| 01:33.40 | [g2] | twice the size |
| 01:33.49 | mithro | i could go with the smaller version |
| 01:33.57 | mithro | but i can't assemble them then |
| 01:34.04 | [g2] | but has a 32-bit 533Mhz processor, flash, memory, two ethernets, power ..... |
| 01:34.35 | mithro | 8 rj-11s take up quite a bit of space too |
| 01:35.11 | ka6sox | ya. |
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| 01:36.46 | mithro | external connections: 8 rj-11s, power connector and a USB connector |
| 01:36.56 | [g2] | ah another hw hacker joins the frey |
| 01:37.26 | mithro | chips: 1xPIC 18F4455, 8xIntersil SLICs, 1 Maxim port extender, 1 TI DAC |
| 01:37.43 | mithro | but as I said, it's a rather complicated project to start with |
| 01:37.55 | [g2] | complicated is a relative term |
| 01:38.10 | ka6sox | what is the Intersil part #? |
| 01:38.15 | mithro | [g2]: compared to a 8 led light flasher :P |
| 01:38.45 | mithro | HC55185 |
| 01:39.51 | ka6sox | don't downplay the importance of Flashy LED's |
| 01:39.57 | mithro | the closest i've come to hardware before now is a breadborded audio amplifier i built in PED and a few self assemble electronics kits from Dick smiths electronics |
| 01:40.13 | mithro | I can program a PIC pretty well |
| 01:41.23 | mithro | so i was thinking something a long the lines of a PIC+DECT chip for a simple DECT->IP bridge |
| 01:41.55 | ka6sox | with only USB1.1 we have to be careful that the overhead and latency don't become an issue. |
| 01:42.36 | ka6sox | the DAC might be very unforgiving of not having data when it needs it. |
| 01:45.17 | mithro | true |
| 01:45.28 | mithro | so.... |
| 01:46.13 | mithro | whats are you people recommending? how should I start? |
| 01:46.33 | ka6sox | when do you have to have this finished? |
| 01:47.10 | mithro | etenity |
| 01:48.13 | ka6sox | okay so this isn't for a class? |
| 01:48.17 | mithro | nope |
| 01:49.10 | ka6sox | well...you have some good ideas there yourself... |
| 01:49.24 | ka6sox | the parts you have chosen are pretty nice. |
| 01:50.16 | mithro | i could have possibly done it for a final year project next year, but my failure of some course has kind of thrown next year into a bit of chaos |
| 01:52.33 | mithro | i would still like to try something a bit simpliar to start with |
| 01:52.51 | mithro | my software skills are pretty good - my hardware skills are still developing |
| 01:56.07 | ka6sox | k |
| 01:57.02 | ka6sox | we used to use 2048kb/s as our loops in the old days..but they were syncronus |
| 01:59.03 | mithro | ? |
| 01:59.03 | dyoung-web | I like the flashy light. |
| 02:00.03 | dyoung-web | Mmmmm Noodles... |
| 02:01.01 | ka6sox | today we have IP phone. |
| 02:15.45 | ka6sox | mithro, all of us are here a lot...so pop on in here when you can. |
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| 02:52.26 | mithro | okay |
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| 18:00.56 | lennert | i hope to find some time this evening to test my serial thingy, been busy with debian bugs |
| 18:01.04 | lennert | ka6sox-office: i'll also send you the svn co tarball today, hopefully |
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