JTAG using dragon

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Problems using the dragon JTAG
The ISP portion seems to work perfect, no problems. While connected to the ATMega32 using ISP, I set the
JTAG enable fuse. I then removed power from the M32 board and unplugged the ISP cable. Then I connected the
10pin JTAG plug. It does not connect. I did reverse one end of the 10 pin connector as the red strip seems to be reversed btween the two plugs.
Question: Is it possible that I damaged to dragon by reversing the 10pin connector?
I am not sure how to verify the JTAG mode even if everything was correct.

I'll believe corporations
are people when Texas executes one.

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Not sure, but you end up connecting TDI and TCK to GND so it's possible the short caused some problems.

Clancy _________________ Step 1: RTFM Step 2: RTFF (Forums) Step 3: RTFG (Google) Step 4: Post

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I have reversed the connectors many time on JTAG1 (not the Dragon) with a board that is mounted in an akward position and surprisingly it still works. Why did you have to enable the JTAG fuse anyway, it is usually enabled by default unless you had changed it previously. The only fuse you need to turn on is the OCDEN if you want to do JTAG debugging. Do you have another chip or board you can test it on?

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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It happened to me a couple of times (AVR Studio 4 not being able to contact Dragon). In both cases I solved the problem reinstalling AVR Studio.

Hope this helps