> No, this would slow us down because these are per-pin. > We need a sum of interrupts so that config space > can be updated by a single command. > Interrupts are a fastpath, extra loops there should be avoided.
It's really not that much of a fast path. Unless you're doing something particularly obscure then even under heavy load you're unlikely to exceed a few kHz. Compared to the average PIC implementation, and the overhead of the actual CPU interrupt, I find it hard to believe that looping over precisely 4 entries has any real performance hit. Paul
