Lpc2000

--- In lpc2100@yahoogroups.com, Robert Adsett <subscriptions@a...> 
wrote:
...snip....
> Did you try a different CPU than the one you hooked up to the 
serial port 
> directly?  The CPU is 5V tolerant but I doubt it likes RS-232 
levels very 
> much.  That would damage the Rx line on the CPU (It might even 
appear to be 
> intermittent).
> 

The first time we tried it directly from the serial port and when it 
didn't work, we thought we fried the Tx and Rx pins - subsequently, 
we connected to the Tx and Rx lines on the Ashling board. (Which went 
through the MAX3232 converter. This brought the voltage down to 3.3.

> Also you mentioned that you are pretty sure you got it into ISP 
mode 
> because the program doesn't start (sounds like a good test).  Have 
you 
> tried simply using a serial terminal to run through the first few 
steps of 
> the communication when it is in that mode?  And compared it with 
the 
> ashling board?
>

Actually we didn't try that. Would we use Hyperterminal or Telnet?
Not sure exactly how to do this. Any examples published anywhere?
I assume that using this technique we could step through the ISP 
protocol to confirm if we are talking to the device? Right?

Thanks,
Bryan 
 
> Robert
> 
> 
> " 'Freedom' has no meaning of itself.  There are always 
restrictions,
> be they legal, genetic, or physical.  If you don't believe me, try 
to
> chew a radio signal. "
> 
>                          Kelvin Throop, III