avrlib macros

[pomprocker]

Here are a couple good avrlib macros I came across while hanging out in arduino land

#define set_output(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#define set_input(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))


#define high(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#define low(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))

[izua]

that's nice, but IMO it's always better to use the bit operators instead of macros.
this way everyone who reads your code will know easily what's going on.