Byron A Jeff <piclist@mit.edu> wrote:

> proc clearbits(copy char count, copy char start)
>   while (count)
>      portb:start = 0 // Clear the bit in PORTB referenced by
>                      // start.
>      start = start+1
>      count = count-1
>   endwhile
> endproc
> 
> The portb:start=0 line is a significant chunk of code because it
> represents a variable bit number. But the compiler gives a compact
> abstraction for the concept. 

    Not disputing your point, but the existence of just one macro
    makes the assembly code even MORE compact than the high-level
    code: 

        clearbits:
            CLRBIT  portb,start
            inc     start
            decfsz  count
            goto    clearbits

    Seems likely that most proficient PIC programmers would have a
    library of reusable macros and subroutines by now. 

    -Andy

=== Andrew Warren -- aiw@cypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
=== 
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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