# JTAG problem on LPC1766 using openocd and jtagkey-tiny

**URL:** <https://community.sparkfun.com/t/jtag-problem-on-lpc1766-using-openocd-and-jtagkey-tiny/20980>\
**Category:** MicroMod\
**Tags:** arm-lpc\
**Created:** [June 12, 2011, 9:45pm UTC](https://community.sparkfun.com/t/jtag-problem-on-lpc1766-using-openocd-and-jtagkey-tiny/20980 "2011-06-12T21:45:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![cedric\_libre](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@cedric\_libre](https://community.sparkfun.com/u/cedric_libre)\
**Post date:** [June 12, 2011, 9:45pm UTC](https://community.sparkfun.com/t/jtag-problem-on-lpc1766-using-openocd-and-jtagkey-tiny/20980/1 "2011-06-12T21:45:58Z")

</div>

Hi,

I’m using openocd 0.4.0 under windows XP, downloaded on freddie chopin’s webpage [http://www.freddiechopin.info/index.php … /4-openocd](http://www.freddiechopin.info/index.php/en/download/category/4-openocd) and the dongle I use is a jtagkey-tiny .

Here is the command I typed :

openocd.exe -f interface\jtagkey-tiny.cfg -f target/lpc1768.cfg

and I get the result that the jtag scan chain interrogation failed : all ones .

Before getting this message, two things are displayed : jtag\_nsrst\_delay: 200 and jtag\_ntrst\_delay: 200

Has someone succeeded to use openocd with jtagkey-tiny and a lpc1766 ?

If someone has a config file for a lpc1766, I would greatly appreciate .

Thanks for the help,

Bye,

Cedric