Lpc2000

From: "peterburdine"
> While not lpc2000 specific, I wanted to see if anyone else here was
> using bit packing to access registers or if they were writing macros
> or just doing to shifts and masking (w/o macros).

Bitfields for I/O access are a definite no-no when using GCC (at least the
GCCgcc-arm-xxx versions I tried). They are optimized into smaller width
accesses, and trying to R/W a byte on a 32-bit wide I/O register will cause
major problems.

Thus, I use macro's, or just write all the low-level stuff into a heavily
commented low-level driver (with shifts and masking).
Of course I first create a header file with #defines for all bit positions
and register addresses.

Regards,
Arie de Muynck