Re: SV: [Gumstix-users] JTAG IO

[Kim H. <ki...@ki...>]

> Hi David
> 
> Thanks for checking, but are you sure 5mA is the clamp current? Anyway as you write 3.3V will be the safe choice.
> 
> Kim did you have succes with your JTAG?

Well, I've made a new jig to hold my gumstix, with connector outputs to the
homemade jtag interface. However, it's still not working :( OCD commander
cannot reset the device. All the voltages seem fine, I'm running the 74HC244 at
3.3V with an LDO regular (And the stix with 3.7 from a li-poly battery).
However, I don't have an oscilloscope or logical analyzer, so I can't see any
signals. I do wonder if the stick's hardware is damaged, though it did stop
working when I was busy with software only, so I can't see how. Maybe it's a
really crap jtag interface circuit :( But how complex can be it?? Maybe I
should try the parallel port in different modes. It's in EPP mode now I think.
It's also extremely difficult to see if the gumstix is properly seated on the
pressure based molex connector. Once the board is on top, you can't see the
inner most pins at all. Although the three other corners which I can see seem
to be properly seated. Having said that, when the stix stopped working, it was
very correctly seated, as it was a software command that stopped it working.

  - Kim