RE: [avr-chat] Atmega128, JTAG and ADC

[Ben Mann]

Placing a breakpoint (and resuming immediately it is called) on the 2nd JTD
line is enough to keep the JTAG enabled when you just want to run the
debugger.

When the pod is connected (and the debugger not running) the JTAG lines are
effectively idle, so (imo) autodetection (even on the ADC) is tricky without
some external hardware and a free GPIO line. There are some simple ways but
it depends on your hardware.

Of course I'm hoping someone will chip in with a great no-hardware solution
I'm not aware of...

Ben

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of Larry
Barello
Sent: Sunday, 17 July 2005 3:49 PM
To: address@hidden
Subject: [avr-chat] Atmega128, JTAG and ADC

Is there a sure-fire way to automagically disable the JTAG interface in code
such that when the JTAG pod is attached the code is skipped?

Right now I have to manually step to the disable code and skip it.

I though I could do something like:

if (MCUCSR & _BV(JTRF) != 1)
{
        MCUCSR |= _BV(JTD);
        MCUCSR |= _BV(JTD);
}

But find that no matter what the code is executed.




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