> Hola, I'm currently working on a project involving Analog's ADE7756
> Energy Meter chip.  It has a 40-bit energy register to store the
> accumulated energy.  I'm coding in Hi-Tech C on a 16F876 and am having
> troubles coming up with a good way to store the data and still be able
> to use it as a simple atomic variable.
>
> PICC doesn't seem to care for long int's, and even still a long isn't
> large enough to store the 40-bit number.  A character array works for
> now, but testing is becoming a pain since I'd like to be able to add and
> multiply this number easily as well as output it using printf to my
> console.
>
> A side note, Hi-Tech's printf produces G's, H's and I's when I print
> using the %x format, last I heard those weren't hex values. :)
>
> Ideas?  Suggestions?  Is there a way to make a 40-bit int?

Write 5 byte math routines in assembler and call them from C.  You
probably only need add, subtract, and maybe multiply and divide.  These
are easily extended from 4 byte routines.


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