From: Matthew S. <ma...@ec...> - 2006-03-22 20:02:56
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I was having significant stability problems when using i2c with high levels of data transfer due to the fact I was interfacing to a 5v microchip pic based circuit and was using pullups connected to that power supply. I have modified the pullups to use the 3.3v from the gumstix with a serious increase in stability (its currently rock solid). Matthew |
From: Chris S. <chr...@gm...> - 2006-03-23 00:17:43
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Were you using a I2C bridge chip to convert to 5V? How *were* you interfacing to 5V? [I'm having my problems with I2C, and I'm curious if mine are the same as yours]. Chris On 3/22/06, Matthew Swabey <ma...@ec...> wrote: > I was having significant stability problems when using i2c with high > levels of data transfer due to the fact I was interfacing to a 5v > microchip pic based circuit and was using pullups connected to that > power supply. > > I have modified the pullups to use the 3.3v from the gumstix with a > serious increase in stability (its currently rock solid). > > Matthew > > > ------------------------------------------------------- > This SF.Net email is sponsored by xPML, a groundbreaking scripting langua= ge > that extends applications into web and mobile media. Attend the live webc= ast > and join the prime developer group breaking into this new coding territor= y! > http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D110944&bid=3D241720&dat= =3D121642 > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Matthew S. <ma...@ec...> - 2006-03-23 11:21:11
Attachments:
mas.vcf
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Nope, I was merely using the 5v power supply to my PIC circuit as the source of the pullups and as a result was sinking too much current into the gumstix which was overheating under sustanined use. Matthew Chris Sears wrote: > Were you using a I2C bridge chip to convert to 5V? > How *were* you interfacing to 5V? > [I'm having my problems with I2C, and I'm curious if mine > are the same as yours]. > > Chris > > On 3/22/06, Matthew Swabey <ma...@ec...> wrote: >> I was having significant stability problems when using i2c with high >> levels of data transfer due to the fact I was interfacing to a 5v >> microchip pic based circuit and was using pullups connected to that >> power supply. >> >> I have modified the pullups to use the 3.3v from the gumstix with a >> serious increase in stability (its currently rock solid). >> >> Matthew >> >> >> ------------------------------------------------------- >> This SF.Net email is sponsored by xPML, a groundbreaking scripting language >> that extends applications into web and mobile media. Attend the live webcast >> and join the prime developer group breaking into this new coding territory! >> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > > > ------------------------------------------------------- > This SF.Net email is sponsored by xPML, a groundbreaking scripting language > that extends applications into web and mobile media. Attend the live webcast > and join the prime developer group breaking into this new coding territory! > http://sel.as-us.falkag.net/sel?cmd=k&kid0944&bid$1720&dat1642 > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users -- Matthew Swabey Rm7025, Bldg21 Faraday Tower Department of ECS University of Southampton University Road Southampton, SO17 1BJ England Tel: 02380 597381 Mob: 07966 440946 |
From: Scott H. <sco...@gm...> - 2006-04-02 01:36:42
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I searched the mailing list and Wiki and I couldn't find a good description of how to talk to a gumstix directly using bluetooth and ssh and scp. I've got a terminal session with minicom working over bluetooth, but I'd like to be able to scp files onto the stick. Do I need a bluetooth router or can I just go Mac->gumsitx directly? Thanks for the help! -Scott |
From: Chris S. <chr...@gm...> - 2006-04-02 01:47:17
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Scott I was looking for this as well. ssh would have been nice, but I *really* wanted TCP for telemetry. I could have written a Java front end on the Mac. In principle this can be done. There is the gumstix aspect and there is the OS X aspect. I think the best help can be found on MacOSXHints. People are able to use their bluetooth cell phones as internet modems. If you get anywhere, or if anyone else knows, I'd really like to know. Chris On 4/1/06, Scott Harris <sco...@gm...> wrote: > > I searched the mailing list and Wiki and I couldn't find a good > description of how to talk to a gumstix directly using bluetooth and > ssh and scp. > > I've got a terminal session with minicom working over bluetooth, but > I'd like to be able to scp files onto the stick. Do I need a > bluetooth router or can > I just go Mac->gumsitx directly? > > Thanks for the help! > > -Scott > > > > > > > ------------------------------------------------------- > This SF.Net email is sponsored by xPML, a groundbreaking scripting langua= ge > that extends applications into web and mobile media. Attend the live webc= ast > and join the prime developer group breaking into this new coding territor= y! > http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D110944&bid=3D241720&dat= =3D121642 > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Dave S. <da...@sm...> - 2006-04-02 08:16:42
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Chris Sears wrote: >Scott > >I was looking for this as well. ssh would have been nice, but I >*really* wanted TCP for telemetry. I could have written a Java front >end on the Mac. > >In principle this can be done. There is the gumstix aspect and there >is the OS X aspect. I think the best help can be found on >MacOSXHints. People are able to use their bluetooth cell phones as >internet modems. > >If you get anywhere, or if anyone else knows, I'd really like to know. > >Chris > >On 4/1/06, Scott Harris <sco...@gm...> wrote: > > >>I searched the mailing list and Wiki and I couldn't find a good >>description of how to talk to a gumstix directly using bluetooth and >>ssh and scp. >> >>I've got a terminal session with minicom working over bluetooth, but >>I'd like to be able to scp files onto the stick. Do I need a >>bluetooth router or can >>I just go Mac->gumsitx directly? >> >>Thanks for the help! >> >>-Scott >> >> >> I haven't done it myself yet, but I do know that MacOS does not support NAP type connections (bnep0 etc). You will need to run pppd at one end or the other, connect over a serial connection (rfcomm like) and do tcp/ip that way. Regards, Dave |
From: Nicholas S-A <no...@ma...> - 2006-03-24 14:09:25
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You could look into these: http://focus.ti.com/docs/prod/folders/print/pca9515a.html They convert between i2c 5V and i2c 3.3V, and they come in SOIC cases, which are not insane to solder. As an added bonus, they "repeat" the signal so that you don't have to worry as much about the maximum 400pF of capacitance on the i2c bus. Somebody earlier on this list had really long wires which were way above the capacitance limit. Could that be your problem? > Were you using a I2C bridge chip to convert to 5V? > How *were* you interfacing to 5V? > [I'm having my problems with I2C, and I'm curious if mine > are the same as yours]. > > Chris |