AVR-Chat

Today will debugging I had the JTAG MKII runining with it and it had 
downloaded just fine a few minuts ago and when i went to do it again 
it errored out and said power supply was down.  Quick check of the 
power with my fluke meter showed 4.99 VDC rock solid supply.

Reset circuit is a Texas Instrument TPS3828-50 with open drain reset 
with 10k pull up and 0.01 bypass on input. M128 is well bypassed, 
supplies on their own planes. 

Al Welch

--- In AVR-Chat@yahoogroups.com, "Ron" <drait1@y...> wrote:
> It could be a problem of "slowly rising power". On most Atmel chips
> you can program the fuses to get a longer start up time, thus
> delaying the chip starting to run until the power is adequate. Ron
>   ----- Original Message ----- 
>   From: Dennis Clark 
>   To: AVR-Chat@yahoogroups.com 
>   Sent: Thursday, 07 April, 2005 12:19 PM
>   Subject: Re: [AVR-Chat] Re: Oh, I am so tired of this..
> 
> 
> 
>   Hmm,
> 
>      You know, I have this happen with my Tiny26 boards too.  They 
just
>   start doing something "else" every once and a while and I can't 
figure
>   out why.  In most cases if I hold down the reset while I power 
the
>   boards on, they work.  And the vast majority of the time the 
boards
>   work fine, but every once and a while...  What the heck is it 
with
>   Atmel devices that they are so flaky?  I've tried every form of 
reset
>   circuit known to man to make my boards reliable, every kind of 
EMI
>   design trick in the book, and still, on occasion, a board goes 
flaky.
> 
>   Hmmm, maybe I should just stay with PICs, they are dead solid 
reliable.
> 
>   Hmmm,
>   DLC
>   P.S.
>      Has anyone ever gotten Atmel to address this, or any other 
issue
>   you have found?  I've yet to get any response from their tech 
support
>   that didn't sound like a robot response from a "cheat sheet".
> 
> 
>   alwelch93021 wrote:
>   > 
>   > Wow Dave, this is about the same way my last few days have 
gone with 
>   > the M128! Last week it was like when i waved a dead chicken 
over the 
>   > boards it worked.  Today I had two new (better artwork/4 layer 
>   > boards) boards with super stable supply rails and the darn 
things 
>   > refused to program. I installed SP2 for the AVRStudio, updated 
the 
>   > STK500 firmware, jtag firmware and still no joy.  Eventually, 
the 
>   > jtag mkII was happy to indicate it was downloading my code but 
then 
>   > it endlessly indicated it was in auto running mode, but never 
stopped 
>   > at the usual entry point in the main program. STK500 did not 
work at 
>   > all with the new boards.  I am miffed as to what is going on. 
I have 
>   > not read all the replies to your post will do so now but I am 
glad to 
>   > see i am not alone if feeling it is flaky to put it kindly.  I 
>   > presume I will eventually find a solution but it sure is 
frustrating 
>   > until you reach that point.
>   > 
>   > Al Welch
>   > 
>   > --- In AVR-Chat@yahoogroups.com, Dave VanHorn <dvanhorn@d...> 
wrote:
>   > 
>   >>It's delivery day, and once again, my AVR tools have all 
decided to 
>   > 
>   > go nuts.
>   > 
>   >>Anyone have any ideas for preventing this garbage?
>   >>
>   >>I have two AVRISPs, an STK-500, an Atmel Jtag ice, and two 
Olimex 
>   > 
>   > Jtag Ices.
>   > 
>   >>I have three M128 target systems in hand. Supposed to be 
identical.
>   >>
>   >>One is running, the other two not.  The two that don't run are 
>   > 
>   > fresh 
>   > 
>   >>builds, after getting to my goal with the first one.
>   >>I don't dare touch the one that's running until I can trust my 
>   > 
>   > tools again.
>   > 
>   >>I've checked everything as best I can on the new systems,  The 
>   > 
>   > chips are 
>   > 
>   >>the same date code, same 8.00 MHz crystals, same (proper 
value) 
>   > 
>   > caps, VCC 
>   > 
>   >>is in tolerance (3.0V), /Reset is pulled up with 1k.  The 
>   > 
>   > oscillator is 
>   > 
>   >>running a rail-to-rail sinewave of the right frequency, which 
at 
>   > 
>   > least 
>   > 
>   >>confirms that the CKOPT fuse has been set.
>   >>
>   >>All the programmers say that they can program and verify the 
chip 
>   >>successfully, and that all the fuses are set right. (including 
M103 
>   > 
>   > fuse, 
>   > 
>   >>CKOPT, WD, and BOD fuses)  Sometimes they fail to verify, or 
read 
>   > 
>   > wierd 
>   > 
>   >>fuse values, but they are all in agreement at the moment that 
>   > 
>   > everything's 
>   > 
>   >>fine.
>   >>
>   >>All three Jtag ices agree that they can load the program, but 
>   > 
>   > cannot read 
>   > 
>   >>the SRAM, registers, or anything else, and cannot run, or even 
>   > 
>   > single-step.
>   > 
>   >>The programmed targets do not run, and apparently do not even 
run a 
>   > 
>   > little. 
>   > 
>   >>The init code isn't even setting up the I/O ports, which is 
about 
>   > 
>   > the first 
>   > 
>   >>thing that I do after qualifying the reset, and setting up the 
>   > 
>   > stack.
>   > 
>   >>I've rebooted everything multiple times, no help
>   >>
>   >>It happens on at least four different computers, running XP 
Pro, 
>   > 
>   > and '98, 
>   > 
>   >>and with old and new studio, though USB serial ports 
and "legacy 
>   > 
>   > COM1" 
>   > 
>   >>(note, these are high end industrial USB serial boxen, not the 
$20 
>   > 
>   > junk)
>   > 
>   >>These are real machines with other software installed, that I 
>   > 
>   > actually use.
>   > 
>   >>Basically, anything studio drives will pack it up at random 
times, 
>   > 
>   > for some 
>   > 
>   >>random duration.
>   >>
>   >>
>   >>I've had this happen any number of times, and it always "goes 
away" 
>   > 
>   > after a 
>   > 
>   >>while, but I REALLY CAN"T AFFORD THIS SHIT ANYMORE. (anyone 
sensing 
>   > 
>   > a high 
>   > 
>   >>level of frustration here?)
>   >>
>   >>At this point, I feel like taking all my AVR tools out into 
the 
>   > 
>   > parking 
>   > 
>   >>lot, making a pile of them, and pounding them into sand with a 
>   > 
>   > splitting maul.
>   > 
>   >>I love the chips, but I really despise the tools.
> 
>   -- 
>   ---------------------------------------
>   Dennis Clark    TTT Enterprises
>   ---------------------------------------
> 
> 
> 
> 
> 
> -------------------------------------------------------------------
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