Lpc2000

----- Original Message ----- 
From: "bclapper29" <clapper@...>
To: <lpc2100@yahoogroups.com>
Sent: Friday, January 02, 2004 8:57 PM
Subject: [lpc2100] trouble programming our prototype board w/ lpc210x ISP


> We are working on a prototype board of our product with the LPC2105.
> When we try to flash our program, we are getting an error "can't
> communicate with test board". We have a serial cable connected to the
> Uart0 ports (pins 13, 14) through a MAX3232 converter.
>
> On the test board side, we have verified that the VDD3.3 and VDD1.8
> and GND are all connected correctly. RST is tied high and pin 44
> (P0.14) is tied low (to enable flash program mode). We checked to
> make sure the oscillator is operating correctly - it is.
>
> We, of course, have checked and rechecked that Tx and Rx are
> configured correctly from the pc to the test board.
>
> I'm wondering if anyone has encountered any issues when programming
> the LPC that might be helpful for us to solve our dilemma? Is there
> something missing?
>
> Also, the other thing that we are confused about is when the flash
> programming utility gives us an error, we can't see any activity on
> either the Tx or Rx lines. We put a scope on those pins. How can it
> know whether or not it can connect to the test board, if it doesn't
> communicate to it?

Is the oscillator frequency correct? Are you getting the value on the
crystal? You can check it on a SW radio if you haven't got a counter.

Also, you need to set it for the ISP utility. I forgot this when I tested my
first board; it worked but wasn't very reliable.

Start off with the baud rate set for 9600, it's less critical.

Have you got a reset switch? I use an RC circuit with the switch across the
C.

Leon
--
Leon Heller, G1HSM
Email: aqzf13@...
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html