Lpc2000

At 05:20 PM 12/3/03 +0000, you wrote:
>if you wanted to get better IOSET/IOCLR then you could do
>
>    while (1)
>    {
>      unsigned int val, vali;
>
>      acc = acc + adder;      //update phase accumulator
>      ptr = (acc &= 0xFF);    //pointer into table
>      val = swatooth[ptr] << 8;  // get our value
>      vali = ~val;
>
>      // set our value onto the output lines..
>      IOSET = val;
>      IOCLR = vali;
>    }
>
>which should pre-compute the inverse of val and then do the
>set of the two registers. You could possibly get a little more
>perfomance to go to assembly.

Even with assembly I would expect to see a significant glitch.  Even at max 
speed I was seeing several hundred nS to perform both operations.  (see 
earlier thread of discussion "Simple test program - is now instruction")

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III