--- In l..., "Leon Heller"
wrote:
> Brendan and Jaya,
>
> Please stop this bickering, otherwise I'll put both of you on
> moderated status!
>
> Leon

Hmm.... That could be a bit too harsh. Mr Jaya is a
university lecturer and some of his students might be reading
this forum now. :)

Why not the 2 gentlemen continue their arguments in a separate
Yahoo forum? => with group title "unconfirmed bugs/shortcoming
of LPC21xxx"? invite some more neutral party like dominic rath
to moderate discussion if needed to?

And we could get rid of those CRP, Spurious Interrupt, UART...
from here once and for all? Start a New Thread

> I trust you do not mind if I add a FAQ section with questions like
> yours and the answers to my original article ... I may do this when I
> get the time.
Thanks for the long answer. I was just trying to find out safe operating
baud rate for my LPC2XXX products.

Yes, FAQ would be great.

Best Regards,

Mukund Deshmukh.
Beta Computronics Pvt Ltd
10/1, IT Park, Parsodi,
Nagpur-440022
Cell - 9422113746 Start a New Thread

Oddly enough we actually use an LPC2292 in one of our products so i've just
quickly done a test on it on the bench connecting to a FTDI chip dev board
we have and don't appear to be getting any dropped characters? I've had a
read through whats listed on your website (cheers for the write up) but as
of yet can't actually reproduce your results. I'm not too worried to be
honest as our product talks to a PC based serial port at 19200 baud so from
your findings is never likely to run into the issue in the field, it's just
rather annoying that I can't seem to replicate what you found.

Andy
-----Original Message-----
From: l... [mailto:l...]On Behalf Of
Mukund Deshmukh
Sent: 23 September 2006 14:22
To: l...
Subject: Re: [lpc2000] Re: no serial port on my PC
> Thanks to an alert by a fellow forum member, the issue has been quite
> adequately documented here:
>
> http://www.cse.unsw.edu.au/~jayas/esdk/lpc2/limitations.html
>
Dear Jaya,

This is from your web site.

//
More specifically, on LPC2292 with 14.7456 MHz crystal, both PLL and MAM
disabled, VPBDIV set to 1, UART set to 8-data 1-stop and no parity, it
works
at 230400 baud and above, but drops characters at 4800 baud and below.

The problem manifests itself only when the UART is connected to devices
(for
example FTDI chip) that can send data at full speed without any delays
between characters at specific baud rates.

//

My question are,

1. What about baud rate between 4800 -230400?

2. You also said that it works at 230400 and above

3. What happen if the serial port is PC and not FTDI chip?

Finally,

Should we conclude that problem is below 4800 AND with FTDI chip AND for
LPC2292?

Best Regards,

Mukund Deshmukh.
Beta Computronics Pvt Ltd
10/1, IT Park, Parsodi,
Nagpur-440022
Cell - 9422113746 Start a New Thread

--- In l..., "Andrew Berney" wrote:
>
> Oddly enough we actually use an LPC2292 in one of our products so
i've just
> quickly done a test on it on the bench connecting to a FTDI chip dev
board
> we have and don't appear to be getting any dropped characters? I've
had a
> read through whats listed on your website (cheers for the write up)
but as
> of yet can't actually reproduce your results. I'm not too worried to be
> honest as our product talks to a PC based serial port at 19200 baud
so from
> your findings is never likely to run into the issue in the field,
it's just
> rather annoying that I can't seem to replicate what you found.
>
> Andy
>

Hi Andy,

Bearing in mind the sensitity of the observed anomaly to baud rate --
less than 0.3 percent variation at either way from 300 baud causes it
to go away, I am not surprised reproducing the results is not easy.

I am also keen on seeing what happens in Joel's case when the crystal
is replaced to see if it could be related to what I observed.

Drop me an email if you dont mind taking this further off-line to see
what is different between our two setups. It may tell us something.

Regards,

Jaya Start a New Thread