AVR-Chat

From: Mark Nowell

To: AVR-Chat@yahoogroups.com

Sent: Wednesday, February 16, 2005 9:41 AM

Subject: Re: [AVR-Chat] STK500 ISP failure

I'm sure it's a dumb question that's going to resolve this and I have
therefore checked (again....) that I've got 0V on Pins 3,5,21 (GND) and 5V
on 4,6 (VCC) and 18 (AVCC).

I just found a thread on AVRFreaks regarding a similar programming problem
where, in the end, a 500kHz clock into XTAL1 fixed the ISP problem because
the AVR had the wrong (external) clock fuses set. Is this a line worth
pursuing?

Thanks again,
Mark

----- Original Message -----
From: "Kathy Quinlan"
To:
Sent: Wednesday, February 16, 2005 4:23 PM
Subject: Re: [AVR-Chat] STK500 ISP failure


>
> Bruce Parham wrote:
>
>>
>> Dumb question: Are ALL of the power and ground pin connected???
>
> Doh forgot to ask that one :|
>
>
>> Bruce
>>
>> Mark Nowell wrote:
>>
>>>Kat
>>>
>>>My older board is for DIP M8 whereas the new board has TQFP M168 - I
>>>don't
>>>actually have a TQFP M8, nor the tools (or eyesight) to solder one in.
>>>The
>>>design of new and old board are obviously not exactly the same but
>>>they're
>>>very similar and (schematically) identical so far as the ISP programming
>>>lines are concerned.
>
> Fun times ahead, ok as pointed out above, check all ground and VCC pins,
> check that MISO is MISO etc (make sure the PCB does not have pins
> swapped or pins miss counted (did that once on a PCB as I had numbered
> the BGA pins wrong :(
>
> Make sure the chip is oriented AROUND THE RIGHT WAY (I had a batch of
> PCB's hand assembled where all the QTPF parts were 90 deg out :(
>
>
>>>The M168 chips were put in for me by hand, so I'm prepared to believe
>>>there
>>>might be assembly faults but I can't find them - if I've got the
>>>necessary
>>>lines connected, and no excessive load on them, shouldn't I expect ISP to
>>>work anyway?
>
> NO the SPIEN fuse may have not been set (which has happened on past
> chips, I think the sample T26's had this problem)
>
>>>I have just taken my JTAG ICE mk-II out of its wrapper and tried the
>>>debugWire interface (not enabled). It also has a facility to enable
>>>debugWire via ISP but this won't work either - AVR Studio suggests
>>>checking
>>>;that the SPIEN fuse is enabled.
>
> DAMN
>
> Regards,
>
> Kat.
>
> --
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