Lpc2000

At 12:21 PM 1/3/04 -0500, you wrote:
>At 09:58 AM 1/2/04 -0800, you wrote:
> >
> >BTW, so far this will be entirely adequate for my needs.  I was just
> >testing the lower boundary to see how it would perform...
>
>Great.  I still think I'll make it a little bit better though.

I did say I was going to improve the timing routines.  I have, and release 
2 of the newlib support routines is available at 
http://www.aeolusdevelopment.com along with some additional documentation 
and a couple of application notes on the timer, including one that 
documents the test results.

Just a quick subset of the tests here.  This covers the small wait area 
previously talked about.  Everything is in microseconds.

req     actual_us       Error
0       1.3     1.3
1       9.2     8.2
2       9.3     7.3
3       9.2     6.2
4       9.2     5.2
5       9.2     4.2
6       9.3     3.3
7       9.2     2.2
8       9.2     1.2
9       9.3     0.3
10      9.2     -0.8
11      9.2     -1.8
12      11.9    -0.1
13      12.9    -0.1
14      13.9    -0.1
15      14.9    -0.1
16      15.9    -0.1
17      16.9    -0.1
18      17.9    -0.1
19      18.9    -0.1
20      20.2    0.2
21      20.9    -0.1
22      22.2    0.2
23      22.9    -0.1
24      24.2    0.2
25      25.2    0.2
26      25.9    -0.1
27      27.2    0.2
28      28.2    0.2
29      28.9    -0.1
30      30.2    0.2

As you can see, it plateaus below 12uS but the constant offset is gone.

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