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| 09:20.29 | mokomoko | Greetings, gents. |
| 09:21.22 | mokomoko | I'm playing with the I2C bus on the Freerunner, I've attached some DIY hardware and I've got the communication going. But there is a problem.... |
| 09:22.07 | mokomoko | Does any one know why there is a mandatory 20ms delay between read/write operations on the I2C bus, even when the slave acknowledges immediately? |
| 09:22.24 | mokomoko | this is really killing my system's performance... |
| 09:22.43 | PaulFertser | mokomoko: hi there. I'm sorry but it's unlikely you get a response here. |
| 09:22.55 | mokomoko | ok. where should I look? |
| 09:23.20 | PaulFertser | mokomoko: do you know about the "navigational board" for freerunner? It has some additional sensors and kernel drivers ready, you can try to look through it for the reference. |
| 09:23.30 | PaulFertser | mokomoko: and write an e-mail to the guy who did the drivers. |
| 09:23.45 | PaulFertser | (i'm not sure if it was spi or i2c...) |
| 09:23.57 | mokomoko | ok... good enough. :) Thank you Paul. |
| 09:24.21 | PaulFertser | mokomoko: hth :) |
| 09:24.21 | mokomoko | is there another IRC channel where I can go with this question? |
| 09:24.44 | PaulFertser | mokomoko: #openmoko-cdevel but your question is too specific i'm afraid, there's not much hardware hackers around unfortunately. |
| 09:25.23 | PaulFertser | mokomoko: you can try to get ahold of Werner (wpwrak) there, he had quite some fun with this stuff. |
| 09:25.28 | mokomoko | yeah, I know... I bet it's just a SW-side problem or config, but it does take a HW hacker to know about it... |
| 09:25.48 | mokomoko | cool, thx. |
| 09:26.03 | PaulFertser | mokomoko: btw, do you mean the delay comes from the kernel driver? |
| 09:27.31 | mokomoko | not sure, but I bet that it does. first, it corresponds to 2 jiffies; second, there is nothing in the bus that prevents faster communication; third there is nothing in the SW that causes the delay. So it should be the kernel/driver, or the master's HW config which goes the same place. |
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| 09:35.03 | mokomoko | I'm using the generic file open(), ioctl(), read(), write() function from Python, which pretty much map directly onto syscalls, so it shouldn't be a Python thing, right? Obviously, I'm opening the device with zero buffering... |
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| 10:10.09 | gremmachook | Hi, just read about the Wikireader. It's an offline reader right? |
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| 10:10.43 | SpeedEvil | yes |
| 10:10.47 | gremmachook | How is the data stored on the device in an offline state? ZIM files? |
| 10:11.05 | SpeedEvil | It's some sort of archive of which I don't recall the details. |
| 10:11.23 | SpeedEvil | You can put your own content on |
| 10:11.31 | gremmachook | Must be either ZIM or ZENO, or is there another one? |
| 10:11.38 | SpeedEvil | Why must it be? |
| 10:11.42 | gremmachook | You mean, add content on the go? |
| 10:11.53 | SpeedEvil | No - load on with a PC |
| 10:12.04 | mjr | iirc they rolled their own, for maximal compressibility and indexability given their constraints |
| 10:12.05 | SpeedEvil | Swap the SD |
| 10:12.09 | mjr | but dunno |
| 10:12.12 | gremmachook | They are the popular ones, hence. But I'd like to know. |
| 10:12.19 | gremmachook | Ok. |
| 10:12.19 | SpeedEvil | yeah - that |
| 10:12.34 | SpeedEvil | The processor is tiny |
| 10:12.47 | SpeedEvil | And can't cope with 'best for PC' files |
| 10:12.47 | gremmachook | Yeah, a pretty awesome one too. |
| 10:13.09 | gremmachook | ZIM are meant for devices usually. |
| 10:13.16 | gremmachook | Of such form factor. |
| 10:13.56 | SpeedEvil | It's not a generic content device. |
| 10:14.10 | SpeedEvil | It's specifically meant and optimised for wikipedia. |
| 10:14.15 | SpeedEvil | well - wiki content |
| 10:14.43 | SpeedEvil | there is support for some text formatting, black and white images (?) and not much more |
| 10:15.11 | gremmachook | Ah, okay. |
| 10:15.26 | SpeedEvil | Oh - no images |
| 10:15.59 | gremmachook | Only text? |
| 10:16.10 | gremmachook | That's a bummer. |
| 10:16.23 | SpeedEvil | It was very much designed to a price. |
| 10:16.42 | SpeedEvil | It does what it does well, but that is looking mroe and more limited over time. |
| 10:16.58 | gremmachook | Was it designed for emerging markets? |
| 10:17.04 | SpeedEvil | No. |
| 10:17.25 | SpeedEvil | I'm not sure who it was aimed at really. |
| 10:17.48 | SpeedEvil | It has great battery life (for the time), and is not as flexible as a computer, with less to go wrong. |
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| 10:18.06 | PaulFertser | gremmachook: iirc it has some support for b&w images. |
| 10:18.07 | SpeedEvil | Some people like single purpoise devices. |
| 10:18.09 | PaulFertser | And math formulas |
| 10:18.28 | gremmachook | PaulFertser, Just saw some screenshots.. |
| 10:19.20 | SpeedEvil | But the hardware is somewhat left behind. |
| 10:19.25 | SpeedEvil | http://cgi.ebay.co.uk/Mini-STM32-Board-STM32F103VCT6-3-2-LCD-Touch-Panel-JTAG-/190506664508?pt=LH_DefaultDomain_0&hash=item2c5b15023c - for example |
| 10:21.25 | gremmachook | SpeedEvil, Yeah, Chinese stuff are available at such low rates. |
| 10:22.14 | SpeedEvil | I mean more the BOM - that has to be made in fairly small quantities - and still sell at a profit |
| 10:22.27 | SpeedEvil | But it's got all of the stuff needed for the wikireader. |
| 10:22.54 | gremmachook | Also, what's the current state of the freerunner? Is it still in dev? |
| 10:23.04 | mjr | not really |
| 10:23.23 | gremmachook | These new OS's killed it. :( |
| 10:23.28 | mjr | some third party people are making new innards for the phone under the name gta04 |
| 10:23.36 | SpeedEvil | IMO - OM killed it. |
| 10:23.49 | gremmachook | Huh? Why so? |
| 10:24.11 | SpeedEvil | By basically not sticking to one 'OS' - and shipping it. |
| 10:24.44 | SpeedEvil | They could have had a saleable phone for geeks with a working and stable phone stack, and GTK and little else by christmas 2007. |
| 10:24.59 | SpeedEvil | But they went off on a lot of wild goose-chases. |
| 10:25.14 | SpeedEvil | Aimed at making it an awesome phone for everyone. |
| 10:25.42 | SpeedEvil | And failing to realise that the herd of elephants coming over the horizong that other phone makers were. |
| 10:26.10 | gremmachook | They should have seen that really. |
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| 10:26.44 | mjr | SpeedEvil, probably fair, yes |
| 10:28.55 | gremmachook | Ok, I'll try asking about the way of storage probably on the mailing list. |
| 10:29.13 | SpeedEvil | google - the file format is out ther. |
| 10:29.20 | SpeedEvil | It's nothing normal, it's custom. |
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| 18:37.10 | PBeck | hi |
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