AVR-Chat

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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