Lpc2000

Yes, to actually get back to topic, hmm.

Might seem silly, have you checked that you have proper
RS232 GND path between host and PC ?
That kind of thing would exhibit the kind of things you see too maybe.

But of course manually talking to the bootloader works OK so, hum.

If you have regular bit errors in each symbol/char, then I'd suspect
a noisy or even sagging supply line as well.
That could account for things working OK when you manually sync
with the bootloader...

-- Kris


> This board does not use RS232 control lines to reset the chip and set
> P0.14  Using LPC21ISP.EXE and hacking the source a bit to give me a
> second to reset the part AFTER the port is opened, but BEFORE it sends
> the first '?' gets me much further.  This utility manages to
> synchronize, set the oscillator value, unlock, read the bootcode
> version, read the part ID, and then issue the first write command..
> BUT.. Then it fails because the echo-back of the UUEncoded write data
> has a couple of bit errors in it.  When I comment out this failure
> detection, I get a CRC error from the LPC at the end of the block,
> meaning that it is probably seeing bit errors as well.  On the host
> side, the errors are generally 1 bit per symbol.
>
> With clock jitter, I would expect all kinds of things to give out before
> a 9600 baud RS-232 connection.  And, as far as I can tell, the
> oscillator circuit is OK.  Looking at it with a scope is a clean sine
> wave.  We're going to put a spectrum analyzer on it, but I'm betting
> this is a power-supply decoupling issue, either with the LPC or the
> MAX232..
>
> I've got a bag of caps, and I'm not afraid to use them..
>
>
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