Lpc2000

Hi Leon,

> apart from glitches - spurs on the waveforms. I think I had the ~ in the
> wrong place.
>
> I didn't get those glitches with the AVR, using the same DAC. I've got
some
> LEDs on some of the lines to the DAC, so I'll try disconnecting them -
they

I figured it had to do something with the IOCLR write of complemented
values.
I think you'll find that the glitches represent the time it takes between
the IOSET and the IOCLR
operation to update the I/O (ie. there are a few instructions involved).

The only way probably will be to use a latch, unless your DAC has a strobe.

Tip : Try declaring a long* for IOCLR and one for IOSET, and write to the
port that way.
Register move instructions are then generated instead of the LDR, which
takes less cycles/time.
If you find the glitches get "narrower", then it's definitely the update
time between IOSET, and
writing the complement to IOCLR.

-- Kris
www.microbit.com.au