Lpc2000

Hi,

First, I think this topic was hashed over a bit awhile back, you might
do a search of the archives for more info.

IAR uses the following in their include files that shipped with my
2148 demo board:

/* GPIO registers */
typedef struct {
  __REG32 P0_0            :1;
  __REG32 P0_1            :1;
  __REG32 P0_2            :1;
  __REG32 P0_3            :1;
  __REG32 P0_4            :1;
  __REG32 P0_5            :1;
  __REG32 P0_6            :1;
  __REG32 P0_7            :1;
  __REG32 P0_8            :1;
  __REG32 P0_9            :1;
  __REG32 P0_10           :1;
  __REG32 P0_11           :1;
  __REG32 P0_12           :1;
  __REG32 P0_13           :1;
  __REG32 P0_14           :1;
  __REG32 P0_15           :1;
  __REG32 P0_16           :1;
  __REG32 P0_17           :1;
  __REG32 P0_18           :1;
  __REG32 P0_19           :1;
  __REG32 P0_20           :1;
  __REG32 P0_21           :1;
  __REG32 P0_22           :1;
  __REG32 P0_23           :1;
  __REG32 P0_24           :1;
  __REG32 P0_25           :1;
  __REG32 P0_26           :1;
  __REG32 P0_27           :1;
  __REG32 P0_28           :1;
  __REG32 P0_29           :1;
  __REG32 P0_30           :1;
  __REG32 P0_31           :1;
} __gpio_bits;

Which is maybe what you're asking for; if IOCLR0 is declated of type
__gpio_bits in your headers, you can say IOCLR0.P0_12

Now there's a few reasons you might not want to do this, but that's
for the experts on this list to point out, cause I was never clear
about exactly what they were.  Possibly issues with endian-ness and
the like...

Steve