[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [avr-chat] Mega128/jtagice problem.

From: Andy Warner
Subject: Re: [avr-chat] Mega128/jtagice problem.
Date: Wed, 27 Jul 2005 09:59:43 -0500
User-agent: Mutt/1.2.5i

Russell Shaw wrote:
> [...]
> I'd first check the oscillator starts ok, if it is ever stopped,
> by using a *low capacitance* cro probe on the crystal.

It's running. It executes code, but just nothing sane until I
manually assert /RESET.

> Then check that there's no capacitive loads on the jtag avr pins.
> If the jtag is powered from the pcb suppy, checks it's not marginal
> like < 4.5V.
> 90% is hardware problems.
> If you have long serial cables or go thru a switch-box to the
> mk-I, try a much slower baud rate, as it has no error checking.

None of these problems apply. It programs the part correctly, managing
to write & verify many K of flash. It just doesn't come out of reset
cleanly. Which is odd, because as I understand it the jtag-ice
has to put the device in reset before it can program the flash..

>From the lack of other replies, I'm getting the message that this
is not a common failure mode. I plan to try a MKII jtag-ice and
see how that changes things - I suppose it is possible that the
MKI I am using is fubar'd somehow.

Andy Warner             Voice: (612) 801-8549   Fax: (208) 575-5634

reply via email to

[Prev in Thread] Current Thread [Next in Thread]