Em 9/7/2010 08:55, Adam Field escreveu:
>> I inserted some 10 uS delay between SDA and SCL lines changing the
>>
>> state. Still no success.
>>
> Like everyone else has said, this is most likely a read-modify-write
> issue. Use a register as a "latch" like on the 18F series. As in:

It doesn't seem to be really a RMW problem. RMW will make a pin have the
*wrong* state ( 1 or 0 ), but not an *undefined* state.

The OP said that the pin stays at 1V for a long period (over 10us if I
understood correctly). This is not '1' nor '0'.

Things to check:

1) Is the pull-up really connected? Isn't it of a too low value?
2) Is the code really outputting a '0'? (check bank selection, perhaps
TRISx is not being written).


Isaac

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