AVR-Chat

I have no problem in running the STK-500 without a target.
It must be something else that is causing your problem.

I look forward to hear more about the Eagle problem. I've been using
Eagle for about 3 years and made a lot of boards without noticing
such a problem. But I layout manually, so I wouldn't route such an
error (pounding chest). However, I have been routing too close to
vias sometimes, and the DRC always have found that. Perhaps it
is something in your DRC check setup ?

/Jesper


----- Original Message ----- 
From: "alwelch93021" <alwelch@axxiomchromatography.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Thursday, April 07, 2005 8:21 PM
Subject: [AVR-Chat] Re: Oh, I am so tired of this..


> 
> 
> I have found my problem (I think) and learned something about the 
> STK500 as well.
> 
> First of all, the STK500 can not even read back the firmware version 
> unless you have a working target attached.  This is strange to me as 
> It leaves you with no way to even test the rs232 comms to the skt500 
> until you have a fully working target attached!
> 
> What i found on my new prototype is the EagleCad software routed two 
> traces (sclk and mosi) right over the top of a GND via that was 
> placed to ground some SMD caps on the top side to the ground plane. 
> Thus the sclk and mosi are grounded.  Running the DRC error check on 
> the board does not even detect the problem!  I plan on emailing the 
> board files to support to ask why it fails to note the traces are 
> laying on top of the GND via! At least the traces are on the bottom 
> side of the board and can be fixed with the exacto knife, etc.
> 
> BTW I measured the voltages on the STK500 at those electrolytic caps 
> on the MAX202 as suggested by others here and sure enough some had 7 
> volts and some were way down to just a few volts. I will replace 
> with some 10UFD 25V X5R 1210 parts i have.
> 
> Al Welch
> 
> --- In AVR-Chat@yahoogroups.com, "Larry Barello" <yahoo@b...> wrote:
>> Have you checked that your JTAG clock is < 1/4 your system clock?  
> Is your
>> system clock working properly?  Are you sure?  Can you use the 
> AVRISP/STK500
>> to check?
>> 
>> -----Original Message-----
>> From: alwelch93021
>> 
>> 
>> The problem for me is that I have no clue as to what the solution 
> is.
>> Is there some problem with the way I designed my board for the 
> ISP6pin
>> and  the JTAG signals. I doublt it as I changed nothing since the 
> last
>> prototyp in that area AND the last pcb had that day last week 
> where it
>> worked after not working for hours in terms of  the tools! The deal
>> yesterday where JTAG indiated it downloaded the program.. showed 
> the
>> progress bar move along and  then spin away with the auto program
>> status and never stopped at entry point. That makes me think the
>> problem is in the tools and no where else.
>> 
>> I really need to get my program loaded and move on but have no 
> qlue as
>> to what to do other than stare at it some more today.
>> 
>> Al
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> Yahoo! Groups Links
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