Re: [avr-gcc-list] Question about gcc preprocessing and port/pin assignments

[Joel Swank]

At 04:04 PM 12/8/04, Richard Urwin wrote:
> If the programmer cannot protect against a problem then the compiler has
> to provide the tools to do it. It seems common-sense to me that that
> tool is 'volatile'.


  The programmer can and should always protect against the problem.
Hardware should always be set with a simple assignment. WOM
hardware needs have an image kept in RAM and only be set from
that image. WOM should never be read. They may not have even
gated the R/W line in. Use a simple assignment when reading
from hardware also.
  If you follow these simple rules you won't have to worry
about how the compiler encodes complex expressions.


--
Joel Swank