AVR-Chat

At 10:24 PM 12/16/2004, Tony Vandiver wrote:

>The real savings if you've got more than one place that this is done is 
>that you could just initialize the pertinent data in each location :
>
> > TSM_Curr2Ptr:
> >     ldi      counter,5      ;a register such as r17
> >
> >     ldi   xl,low(TSM_Data_Curr)      ;Setup origin
> >     ldi   xl,high(TSM_Data_Curr)
> >
> >     ldi   yl,low(TSM_Data_Ptr)        ;Setup destination
> >     ldi   yl,high(TSM_Data_Ptr)
>
>Then jump to the common cleanup to complete the subroutine :


I do a number of buffer routines like this.
Load pointers, then call the routine to do the operation.
Middlin' efficient.

Remember in the time it takes us to load two 16 bit pointers, the pic has 
flipped it's bank select, and loaded a byte into W. :)