Has been a long time for me but Once Upon A Time it wasn’t just a matter of
“not using functions in the library”. AVR-gcc required primatives other than
startup code. It couldn’t do most operations on longs in-line, called library
functions with names outside of usual C-space. I remember being concerned about
using those inside an interrupt service routine. Unrolled my uint32_t in a
union for ++ or — on the least significant 16, test and repeat in most
significant if necessary for carry or borrow.
if( ! ++val.low ) ++val.high;
Or:
if( val.low || val.high ) // I like to count down to zero
if( val.low— ) val.high—;
Back then AVR-gcc was not smart enough to do the above automatically.
I used a lot of uint32_t and uint64_t as counters to mark the passage of time.
--
David Kelly N4HHE, dke...@hiwaay.net
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Whom computers would destroy, they must first drive mad.
