Lpc2000

When you switch the ARM7 into debug mode, all instructions and data are 
read from the jtag interface. You can just upload a ldm instruction for 
example with the data following the instruction and then use a stm 
instruction to store it in sram. Then you setup the registers to call 
the IAP routine and set a breakpoint to the same address the LR is 
pointing to. The ARM site has excelent documentation on this, so I 
suggest you browse www.arm.com and lookup the information you need.

A suggestion: use a FT2232 (see 
http://www.ftdichip.com/FTProducts.htm#FT2232C) for the low level JTAG 
stuff, they have a JTAG DLL for windows and good documentation the write 
this yourself for other platforms. All you need is this single FT2232 
and some passive components to make this work.

Richard Duits



Piotr Zbysinski wrote:

> I plan to build Flash programmer (via JTAG) for LPC2K. Is there
> anybody who knows JTAG command codes used for SRAM loading?
> Rgs
> Piotr
>
>
>
>
> SPONSORED LINKS
> Microcontrollers 
> <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=OPqm0ilH6VyGn-geZ0nNwA> 
> 	Microprocessor 
> <http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=e6n93hF7rArBsrPQJltQ_w> 
> 	Intel microprocessors 
> <http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=EENrTtKaQUw-Vd0BgTdDmw> 
>
> Pic microcontrollers 
> <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=iYT6za1gT3-VT1hwIylDpw> 
> 	8085 microprocessor 
> <http://groups.yahoo.com/gads?t=ms&k=8085+microprocessor&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=PhYMBsCkQptYbazQFyNujQ> 
>
>
>
> ------------------------------------------------------------------------
> YAHOO! GROUPS LINKS
>
>     *  Visit your group "lpc2000
>       <http://groups.yahoo.com/group/lpc2000>" on the web.
>        
>     *  To unsubscribe from this group, send an email to:
>        lpc2000-unsubscribe@yahoogroups.com
>       <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe>
>        
>     *  Your use of Yahoo! Groups is subject to the Yahoo! Terms of
>       Service <http://docs.yahoo.com/info/terms/>.
>
>
> ------------------------------------------------------------------------
>