From: Benny S. (webmail) <ben...@ma...> - 2004-07-28 22:06:03
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5V won't help you. The stix will still run on 3.3V on the interface and I = don't know if the PXA is 5V tolerent on the input pins. I use a 74LVT244 = running on 3.3 V. Input and output looks fantastic on a scope so the only = thing I need is that the program should work. If I try to send the reset command continuesly (something heavy on the = Enter key) it's quite easy to power up the stix in a mode where it draws = less current than if I just turn the power on. After that status will say = "in DEBUG" and I can read "regs" without any errors. If I try to to reset = I will get the message "reset_and_halt: command timeout (24 : 1E)". If I = try to send the "WORD 0x48000008 =3D 0x0000A5BB" I will get the message = "Write large : internal error 40 : 15)". I don't have any idea of what is going wrong and I give up for the moment = and hope you or someone else who has a stix ala doorstop will have better = luck than I. Best Regards Benny -----Oprindelig meddelelse----- Fra: gum...@li... Til: gum...@li... = <gum...@li...> Emne: Re: SV: Re: SV: Re: SV: [Gumstix-users] turned my stick into a = doorstop Dato: 28-07-2004 15:46:58 > > Guess PC side is ok, but would choose to put a pullup on the gumstix = side as well. As long as both the PC and Gumstix is connected the pullup = is not "used" (pullup resistors are hopefully mounted on the gumstix and = the PC port will work without) >=20 > Thanks for the suggestion. I'll put jumpers on the board to enable them = or > not. It's not clear to me whether or not a 74HCT244 will work on a 3.7V = supply > that I use. Maybe a 74LV244 should be used? In any case, I can always = choose to > run the gumstix on 5V whilst I jtag debug I guess. The shops around here = don't > have any low voltage chips, I'd have to order them. >=20 > - Kim >=20 >=20 > ------------------------------------------------------- > This SF.Net email is sponsored by BEA Weblogic Workshop > FREE Java Enterprise J2EE developer tools! > Get your free copy of BEA WebLogic Workshop 8.1 today. > http://ads.osdn.com/?ad_id=3D4721&alloc_id=3D10040&op=3Dclick > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users >=20 >=20 |