Lpc2000

Just my 2 cents ...

Using bit fields is defenitely not the best way to do bitwise I/O on the 
lpc21xx

The LED2 = 1 instruction will not be an atomic instruction when done 
using bit fields.
Use:

    #define LED2 (1<<12)
    port0_set = LED2

makes use of the special I/O set register. This is faster (it saves a 
read from port0_reg) and atomic

Bit fields will do the job. But if - in the end - you discover that you 
need to optimize your code this will cost you some time ...

        Rob

Joel Winarske wrote:

>>I was looking for something that would let me do:
>>
>>if(LED1)
>>  LED2 = 1;
>>
>>This would require associating LED1 and LED2 with a particular bit in
>>the appropriate IOPIN register.  Judging from your response, this is
>>not possible with GCC and ARM?
>>    
>>
>
>If you're ok with bit fields, try this (it works in IAR, should work in
>GCC):
>
>struct PORT  {
>     unsigned bit0:1;
>  
>
...