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pour mettre un bit a 1

X | 0 = X
X | 1 = 1

pour mettre un bit a 0

X & 0 = 0
X & 1 = X

#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit)) 
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit)) 

uint8_t FLAGS = 0;

#define F_SW 0 #define F_CLK 1 #define F_WAITFORLONG 2 #define F_REVERSE 3