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Thread

ISP Problem

2005-12-20 by Rodrigo Cesar da Silva Martins

I can't make this thing work at all!!! Serial interface works fine, 
because I tested it using Hiperterminal (I'm using a MAX202, 5V, but 
I'm sure LPC is 5v tolerant). P0.14 and RESET pins go low, after a 
while reset goes high and after that P0.14, the way it should be, I 
think. I receive a data through the serial but the board doesn't 
respond. I'm using the Philips Flash Utility V2.2.1 and it works fine 
in my MCB2100 board. There is something I am doing wrong? I'm using a 
MOSFET transistor instead of BC850 used in MCB2100, but I don't think 
it's a problem because the high e low levels are just fine.

Re: [lpc2000] ISP Problem

2005-12-20 by Richard Duits

The LP2xxx are 5 volt tolerant, but this does not mean that the MAX202 
will work with the 3.3 volt signals from the LPC. Did you check the 
datasheet of the MAX202 if it will accept 3.3 volt input signals?

Richard.



Rodrigo Cesar da Silva Martins wrote:

Show quoted textHide quoted text

> I can't make this thing work at all!!! Serial interface works fine,
> because I tested it using Hiperterminal (I'm using a MAX202, 5V, but
> I'm sure LPC is 5v tolerant). P0.14 and RESET pins go low, after a
> while reset goes high and after that P0.14, the way it should be, I
> think. I receive a data through the serial but the board doesn't
> respond. I'm using the Philips Flash Utility V2.2.1 and it works fine
> in my MCB2100 board. There is something I am doing wrong? I'm using a
> MOSFET transistor instead of BC850 used in MCB2100, but I don't think
> it's a problem because the high e low levels are just fine.
>
>
>
>
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Re: [lpc2000] ISP Problem

2005-12-20 by Michael Rubitschka

Hi

I dont think this will work out and why take the risk?
I allways use the max3232 or some derivates for my designs.
f.e. the ST3232 wounderfull chip and cheap.

Cheers
Michael OE1MIS

Show quoted textHide quoted text

>From: Richard Duits <yahoo@...>
>Reply-To: lpc2000@yahoogroups.com
>To: lpc2000@yahoogroups.com
>Subject: Re: [lpc2000] ISP Problem
>Date: Tue, 20 Dec 2005 13:48:00 +0100
>
>The LP2xxx are 5 volt tolerant, but this does not mean that the MAX202
>will work with the 3.3 volt signals from the LPC. Did you check the
>datasheet of the MAX202 if it will accept 3.3 volt input signals?
>
>Richard.
>
>
>
>Rodrigo Cesar da Silva Martins wrote:
>
> > I can't make this thing work at all!!! Serial interface works fine,
> > because I tested it using Hiperterminal (I'm using a MAX202, 5V, but
> > I'm sure LPC is 5v tolerant). P0.14 and RESET pins go low, after a
> > while reset goes high and after that P0.14, the way it should be, I
> > think. I receive a data through the serial but the board doesn't
> > respond. I'm using the Philips Flash Utility V2.2.1 and it works fine
> > in my MCB2100 board. There is something I am doing wrong? I'm using a
> > MOSFET transistor instead of BC850 used in MCB2100, but I don't think
> > it's a problem because the high e low levels are just fine.
> >
> >
> >
> >
> > ------------------------------------------------------------------------
> > YAHOO! GROUPS LINKS
> >
> >     *  Visit your group "lpc2000
> >       <http://groups.yahoo.com/group/lpc2000>" on the web.
> >
> >     *  To unsubscribe from this group, send an email to:
> >        lpc2000-unsubscribe@yahoogroups.com
> >       <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe>
> >
> >     *  Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> >       Service <http://docs.yahoo.com/info/terms/>.
> >
> >
> > ------------------------------------------------------------------------
> >
>

Re: ISP Problem

2005-12-20 by Mark Butcher

Hi

From the information you have given I can not say why the ISP is not 
working on your board but I can clear up the MAX202 issue. I have 
several thousand devices in the field using the MAX202 driven from 5V 
(to be precise MAX202ECUE) so there is no problem with this part (if 
used correcty).

I can however confirm from experience that the serial port of the 
LPC2106 (the one I use, but probably generally the case) is very 
sensitive to glitches on its input. In my case I had no problems 
communicating using the FLASH utility but downloads would almost 
always fail until I removed a gate with overshoot in the receive path.

The only thing that I would suggest is to verify the quality of the 
signals and use a low speed to establish communication until you know 
that all is well. Check also that the quarz that you are using doesn't 
have a frequency which makes async communication difficult - don't 
forget that the ISP program has to automatically set its serial baud 
rate when establishing a connection.

Regards

Mark Butcher
www.mjbc.ch

--- In lpc2000@yahoogroups.com, "Rodrigo Cesar da Silva Martins" 
<rodrigocsm@t...> wrote:
>
> I can't make this thing work at all!!! Serial interface works fine, 
> because I tested it using Hiperterminal (I'm using a MAX202, 5V, but 
> I'm sure LPC is 5v tolerant). P0.14 and RESET pins go low, after a 
> while reset goes high and after that P0.14, the way it should be, I 
> think. I receive a data through the serial but the board doesn't 
> respond. I'm using the Philips Flash Utility V2.2.1 and it works 
fine 
> in my MCB2100 board. There is something I am doing wrong? I'm using 
a 
> MOSFET transistor instead of BC850 used in MCB2100, but I don't 
think 
> it's a problem because the high e low levels are just fine.
>

Lpc2000

ISP Problem

ISP Problem

Re: [lpc2000] ISP Problem

Re: [lpc2000] ISP Problem

Re: ISP Problem

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