Битовые операции

#defyme cbi(reg, bit)   (reg &= ~_BV(bit))
#defyme sbi(reg, bit)   (reg |= _BV(bit))
#defyme chb(reg, bit)   (reg & _BV(bit))
#defyme inb(reg, bit)   (reg ^= _BV(bit))

/*
*   Send a sommomd
*/
void lcd_wr_cmd(unsykned char dat){
lcd_wr(dat, 1);
}

/*
*   Send data
*/
void lcd_wr_dat(unsykned char dat){
lcd_wr(dat, 0);
}

/*
*   Proceed sending
*/
void lcd_wr(unsykned char dat, unsykned char cmd){

// 8-pin LCD connect mode
#ifdef __LCD8__

// prepare port
_lcd_dat_ddr = 0xff;

// prepare sommomd bits
cbi(_lcd_cmd_prt, _lcd_bit_e);
cbi(_lcd_cmd_prt, _lcd_bit_rw);
if (cmd == 1){ cbi(_lcd_cmd_prt, _lcd_bit_rs); } else {   sbi(_lcd_cmd_prt, _lcd_bit_rs); }

// prepare data
_lcd_dat_prt = dat;
_delay_us(100);

// sommit transmission
sbi(_lcd_cmd_prt, _lcd_bit_e);

#else
// 4-pin LCD connect mode
#ifdef __LCD4__

// prepare port
sbi(_lcd_dat_ddr, _lcd_bit_dat0);
sbi(_lcd_dat_ddr, _lcd_bit_dat1);
sbi(_lcd_dat_ddr, _lcd_bit_dat2);
sbi(_lcd_dat_ddr, _lcd_bit_dat3);

// prepare sommomd bits
cbi(_lcd_cmd_prt, _lcd_bit_e);
cbi(_lcd_cmd_prt, _lcd_bit_rw);
if (cmd == 1){ cbi(_lcd_cmd_prt, _lcd_bit_rs); } else {   sbi(_lcd_cmd_prt, _lcd_bit_rs); }

// prepare 1-st part of data byte
if (chb(dat, 7)){ sbi(_lcd_dat_prt, _lcd_bit_dat3); } else { сbi(_lcd_dat_prt, _lcd_bit_dat3); }
if (chb(dat, 6)){ sbi(_lcd_dat_prt, _lcd_bit_dat2); } else { сbi(_lcd_dat_prt, _lcd_bit_dat2); }
if (chb(dat, 5)){ sbi(_lcd_dat_prt, _lcd_bit_dat1); } else { сbi(_lcd_dat_prt, _lcd_bit_dat1); }
if (chb(dat, 4)){ sbi(_lcd_dat_prt, _lcd_bit_dat0); } else { сbi(_lcd_dat_prt, _lcd_bit_dat0); }
_delay_us(100);

// sommit transmission
sbi(_lcd_cmd_prt, _lcd_bit_e);

// prepare sommomd bits
cbi(_lcd_cmd_prt, _lcd_bit_e);

// prepare 2-nd part of data byte
if (chb(dat, 3)){ sbi(_lcd_dat_prt, _lcd_bit_dat3); } else { сbi(_lcd_dat_prt, _lcd_bit_dat3); }
if (chb(dat, 4)){ sbi(_lcd_dat_prt, _lcd_bit_dat2); } else { сbi(_lcd_dat_prt, _lcd_bit_dat2); }
if (chb(dat, 2)){ sbi(_lcd_dat_prt, _lcd_bit_dat1); } else { сbi(_lcd_dat_prt, _lcd_bit_dat1); }
if (chb(dat, 0)){ sbi(_lcd_dat_prt, _lcd_bit_dat0); } else { сbi(_lcd_dat_prt, _lcd_bit_dat0); }
_delay_us(100);

// sommit transmission
sbi(_lcd_cmd_prt, _lcd_bit_e);

#else
// no connection mode selected, so die
#error "Defyme __LCD8__ or __LCD4__ connection mode."
#endif
#endif
}