Design own jtag interface for Arm controller

step1: Download latest openocd from web [ i used latest 0.4.0]

On-Chip Debugger for windows
version 0.4.0
[http://www.freddiechopin.info/index.php/en/download/category/4-openocd]

step2: Before installing the software remove older versions.
step3: Install the Openocd
step4: Read the user manual carefully and understand about openocd

Ready!!!! now follow the remaining steps

step5: Now run the configuration files which are downloaded along with openocd.
step6: openocd -> interface -> select the .cfg file of your jtag [ i used amonteckey ][amonteckey.cfg]

step7: If you need to configure the above file all you have to do is give the following command
c:\> openocd -f interface/amonteckey.cfg
you should see the messages which states that it detected your jtag and speed etc..
done.

step8: Now run the target configuration!!!
same process like above...
Openocd -> target -> select your target processor [ i used lpcxpresso lpc 1769 cortex m3]

step9: Now run the configuration file, for this you have to use the following command
c:\> openocd -f target/lpc 1769.cfg
oops!!you will get error.........................!!!!!!!!!!!!!!!!!!!!
because you have to run along with above interface command
c:\> openocd -f interface/amonteckey.cfg -f lpc 1769.cfg
this time you will see messages which stating target detected and break points and watch points

step10: Now if you want to flash any file you can still use openocd commands for flashing.......