Lpc2000

* dasbento@... <dasbento@...>:
> anyone knows if is possible change the mode of
> the external interrupt when the arm is in
> operation,

It seems the external interrupt registers are
seriously broken.

I have read the LPC2214's errata sheet, namely
version 1.6. Three erratas concern the external
interrupt registers: EXTINT.1, EXTINT.2 and
VPBDIV.1. 

However what I found was that the workarounds
suggested:
   
   a. were not always necessary
   b. didn't always work

Which is a bit unfortunate.

In a bit more detail:

I was able to configure EXTINT0 as rising edge
sensitive *without* implementing any of the
workarounds.

I was *not* able to configure EXTINT0 as rising
edge *with* all the workarounds.

I was able to configure EXTINT3 as rising edge
sensitive only with all the workarounds *and* only
if EXTINT0 had not been configured previously.

If EXTINT0 had been configured as rising-edge
sensitive first, then I wasn't able to configure
EXTINT3 as rising-edge at all, workaround or not.

JR