Steve
On 9/1/06, Andy Warner <[EMAIL PROTECTED]> wrote:
On 9/1/06, Steve Franks <[EMAIL PROTECTED]> wrote:
> Ok, now I feel like a dufus. The problem appears to be a function of the
> jtagiceII, the one variable I never changed while pulling out my hair last
> night/this morning. (At least my pcb's are proven good now) - WIth it
> (jtagice) removed, toggling the reset pin causes normal execution. So it
> would appear my jtagice interacts radically differently with the Mega644
> than with most of our other designs (which use 162 and 128 mostly). Note
> [...]
I have a 128-based project (that is mothballed for different, totally
unrelated reasons) that exhibited similar behaviour. It would not
reliably come out of reset after the jtagice was done, I did not try
single stepping through the code from the first instruction, so I have
no idea if that worked.
If I remember correctly (I'm @ a customer site w/o access to the
schematics for that project) it may have had an LCD controller that
also hung off the reset line, in addition to external Power-on-reset
and reset button circuitry... Does your design have any of this extra
stuff hanging off the reset line too ?
Because his board had a reset button, and the project got put into
hibernation soon after the prototype boards came back, I never really
drilled down into this, though I knew I'd need to figure out what was
going on.. If I can find some spare cycles, I'll see if I can't dig it out,
hook up a scope and see what's happening - maybe it'll help triangulate
on your problem..
--
Andy
--
Steve Franks, KE7BTE
Staff Engineer
La Palma Devices, LLC
http://www.lapalmadevices.com
(520) 312-0089
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