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Different ways to set registers in C and delays

Andrew Preston over 12 years ago

Good Morning everyone.

A long time ago I seam to remember in AVR-GCC I could set registers using something like:

Wonder if there is a variant like this in C51.

Also, are are there any standard delay function.

Begard Regards

Andy

0 J. dl2iac over 12 years ago

A variant? Yes, put into a global header file:

/* Helper macros HEX__ and B8__ not to be used directly */
#define HEX__(n) 0x##n##UL
#define B8__(x) (\ 
    (((x)&0xF0000000UL)?0x80:0) | \ 
    (((x)&0x0F000000UL)?0x40:0) | \ 
    (((x)&0x00F00000UL)?0x20:0) | \ 
    (((x)&0x000F0000UL)?0x10:0) | \ 
    (((x)&0x0000F000UL)?0x08:0) | \ 
    (((x)&0x00000F00UL)?0x04:0) | \ 
    (((x)&0x000000F0UL)?0x02:0) | \ 
    (((x)&0x0000000FUL)?0x01:0))

/* For up to 8-bit binary constants */
#define BIN(b) ((unsigned char)B8__(HEX__(b)))

and use it like this:

unsigned char temp = BIN(01010110);