AVR-Chat

Mark Nowell wrote:
>>Mark Nowell wrote:
>>
>>>>If the xtal in/out pins are VCC/2, then the xtal should be oscillating.
>>>>
>>>
>>>I appear to have ~0.2V on both xtal pins, so not VCC/2 (5V VCC).
>>>
>>>Mark
>>
>>Then the xtal isn't the problem.
>>
>>Make sure none of the programming pins or the reset pin are being
>>loaded by other components on the pcb. That includes things like
>>capacitors connected to the reset pin.
>>
> 
> I had a 10k pull-up and 0.1uF cap on Reset - I didn't think the cap was big 
> enough to cause trouble but I took it out anyway. I also had 6k2 pull-ups on 
> MOSI/MISO which I've again removed. No change.
> 
> Mark

If there's nothing interfering with the pins, then i don't know. Maybe
you could test if the stk500 works on a different chip.

See if there's any waveforms on the reset/mosi/miso pins with a cro
when attempting programming.