m168-programming/AVR-Programming-Library/macros.h

27 lines
744 B
C

/* Standard Macros */
/* You can totally get by without these, but why? */
/* Make sure we've already got io / sfr / pindefs loaded */
#ifndef _AVR_IO_H_
#include <avr/io.h>
#endif
/* Reminder: the following useful bit-twiddling macros are
always included in avr/sfr_defs.h, which is called from
avr/io.h
bit_is_set(sfr, bit)
bit_is_clear(sfr, bit)
loop_until_bit_is_set(sfr, bit)
loop_until_bit_is_clear(sfr, bit)
*/
/* Define up the full complement of bit-twiddling macros */
#define BV(bit) (1 << bit)
#define set_bit(sfr, bit) (_SFR_BYTE(sfr) |= BV(bit)) // old sbi()
#define clear_bit(sfr, bit) (_SFR_BYTE(sfr) &= ~BV(bit)) // old cbi()
#define toggle_bit(sfr, bit) (_SFR_BYTE(sfr) ^= BV(bit))