SV: Re: SV: Re: SV: Re: SV: [Gumstix-users] turned my stick into a doorstop

[Benny S. (webmail) <ben...@ma...>]

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
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>=20
>=20