I think you can directly use 2 RS232 lines (ok via MAX232 or equal) to
control both lines.
So your mentioned 5 ms are created by a while loop / timer directly on PC.
No transistors, no RC !
Or have i understand something wrong or overlooked something ?
But i still have the problems of the missing ISP programmel...
Greetings,
Martin
----- Original Message -----
From: "Lasse Madsen" <lm@...>
To: <lpc2100@yahoogroups.com>
Sent: Monday, January 05, 2004 1:25 PM
Subject: SV: [lpc2100] Small Problems with ISP Utility -> Solutions / self
written ISP utility ?
> The automatically switching can be easily achieved by using a couple of
> transistors, an RC led that can hold a transistor turned on for approx 5mS
> shorting the P0.14 to ground one could tie the RST line to one of the
RS232
> control signals from the PC and write an ISP program to control the
> transistor..
>
> regards
> lasse m.
>
> -----Oprindelig meddelelse-----
> Fra: capiman@... [mailto:capiman@...]
> Sendt: 5. januar 2004 11:12
> Til: lpc2100@yahoogroups.com
> Emne: Re: [lpc2100] Small Problems with ISP Utility -> Solutions / self
> written ISP utility ?
>
>
> Hello Leon,
>
> i am using it meanwhile completely with 115200 (using a MAX232 at 5V)
> but everytime i want to upload something i restart the ISP utility
> completely new.
> Since this no errors in transfer.
> (But i must say i found a bug in soldering my SUB-D connector. One cable
> makes a short when i move position of the connector...)
>
> But of course the left open COM-Port by Philips ISP util makes my thinking
> about other ways:
> What about a ISP util which uses two more RS232 lines to also control
RESET
> and enable booting.
> So the PC tool itself can reset the LPC210x, switch to boot mode, upload,
> and when everything is fine, do a reset again, switch off boot mode and
> reset (to start the just developed programm)...
>
> What do you all think about this ? Could be a convenient way...
> I think i should start to write an ISP util, if no one else has done it
> before (want to avoid duplicate programming, time is rare...)
>
> Greetings,
>
> Martin
>
> ----- Original Message -----
> From: "Leon Heller" <leon_heller@...>
> To: <lpc2100@yahoogroups.com>
> Sent: Monday, January 05, 2004 11:01 AM
> Subject: Re: [lpc2100] Small Problems with ISP Utility -> Solutions / self
> written ISP utility ?
>
>
> >
> > ----- Original Message -----
> > From: "Hugh O'Keeffe" <hugh.okeeffe@...>
> > To: <lpc2100@yahoogroups.com>
> > Sent: Monday, January 05, 2004 9:52 AM
> > Subject: RE: [lpc2100] Small Problems with ISP Utility -> Solutions /
self
> > written ISP utility ?
> >
> >
> > >
> > > Hi Martin,
> > >
> > >
> > > The LPC2xxx Flash Boot Loader (FBL) firmware appears to have trouble
on
> > > certain PCs with the autobaud synchronisation at high baud rates. If
youShow quoted textHide quoted text
> > > get comms problems at 115K/bs then lower this value. Also, reset your
> > > LPC2xxx board every time prior to connection to the PC.
> >
> > I can't get it running any faster than 38.4 k
> >
> > Leon
> > --
> > Leon Heller, G1HSM
> > Email: aqzf13@...
> > My low-cost Philips LPC210x ARM development system:
> > http://www.geocities.com/leon_heller/lpc2104.html
> >
> >
> >
> > Yahoo! Groups Links
> >
> > To visit your group on the web, go to:
> > http://groups.yahoo.com/group/lpc2100/
> >
> > To unsubscribe from this group, send an email to:
> > lpc2100-unsubscribe@yahoogroups.com
> >
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> >
> >
>
>
>
>
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