Lpc2000

----- Original Message ----- 
From: "Jan Szymanski" <janek@...>
To: <lpc2000@yahoogroups.com>
Sent: Saturday, February 05, 2005 9:45 AM
Subject: [lpc2000] How to debug the debuging interface ?


> 
> 
> I have samples of LPC2138 and I built a prototype board.
> With an evaluation version of CrossStudio I created a simple blinking 
> LEDs application.
> Using Philips flash utility I am able to program the micro and it 
> works. Have problems however with debugging and programming through 
> JTAG. I tried both JLink and Olimex wiggler compatible jtags, which 
> are working fine with another board (IAR Kicstart Kit for LPC2106)
> using either IAR or RA software.
> With 2138 board I am able to connect to JTAG (from CrossStudio menu),
> but when trying to do anything else, JTAG is loosing communication 
> with the target.
> My JTAG interface hardware is a copy of the one used on the Keil 
> MCB2130 evaluation board (see schematic here
> http://www.keil.com/mcb2130/mcb2130-schematics.pdf )
> I checked the connections and all looks OK. 
> The supply voltage (+3.3V) is very clean and connections between 
> microcontroller and JTAG socket are rather short.
> Any hints or suggestions will be appreciated.

Have you tried using a slower interface setting for the JTAG?

Leon


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