Lpc2000

The cannot identify means that the CPU ID read back is either all zeroes
or all ones.

This can be caused by a number of things, all bad:

#1. TDO not correctly wired up so always reads 1.

#2. JTAG going too fast, set the JTAG divisor lower.  As you are using
an LPC2148, there is no possibility of adaptive clocking, so depending
upon how fast your CPU starts up, you may need to use a larger JTAG
divisor.

#3. TCK, TMS, and TDI not correctly wired.  In fact, any of these not
wired correctly will cause JTAG failure.  So, all in all, check out your
circuit...

--
Paul Curtis, Rowley Associates Ltd  http://www.rowley.co.uk
CrossWorks for MSP430, ARM, AVR and now MAXQ processors

> -----Original Message-----
> From: punkandsska123 [mailto:jeromerivard@...] 
> Sent: 24 February 2006 18:16
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] Jtag from k9spud
> 
> Hi, I have make the Wriggler from www.k9spud.com/jtag.   
> 
> I try to use it with Rowley CrossStudio for Arm but it seems 
> not works.
> 
> A message box say :   
> 
> Cannot Identify Target
> Check JTAG connection.
> 
> 
> I use a Olimex board with a Philips 2148.  My original wriggler work 
> perfectly with crossstudio so parrallel port is fonctional.
> 
> What is the problem you think. ? 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 
>