/* initializes lcd for use, this or lcd_init_wo_ir MUST be called first
*
* Note: this function does NOT assume internel reset circuit power
* conditions were met
*/
void lcd_init(void)
{
int i;
/* set control pins as output */
DDR(EN_PORT) |= _BV(EN_PIN);
DDR(RW_PORT) |= _BV(RW_PIN);
DDR(RS_PORT) |= _BV(RS_PIN);
/* set data pins as output */
data_pins_out();
/* wait until lcd is finished booting */
_delay_us(BOOT_DELAY);
/* set control pins for function set */
for (i = 0; i < 3; i++) {
set_rs_low();
set_rw_low();
set_data_pins(F_SET_INITIAL);
toggle_e();
_delay_us(INIT_DELAY);
}
/* final function set, set's 8bit operation, 2-line disp, 5x8 font */
set_data_pins(F_SET_DEFAULT);
toggle_e();
_delay_us(INIT_DELAY);
lcd_command(DISP_OFF); /* display off */
lcd_command(CLEAR_DISP); /* display clear*/
lcd_command(ENTRY_DEFAULT); /* set entry mode to INC, no shift */
lcd_command(DISP_ON); /* display on */
}
/* writes byte to controller
* Input data byte to write to LCD
* rs 1: write data
* 0: write instruction
*/
static void lcd_write(uint8_t data, uint8_t rs)
{
if (rs)
set_rs_high();
else
set_rs_low();
set_rw_low(); /* RW=0 for all write operations */
data_pins_out(); /* set's data pins for output */
set_data_pins(data);
toggle_e();
}
// rs = TRUE to write data, FALSE to write to command
static void lcd_write(const HD44780* device,uint8_t data,boolean rs){
lcd_waitbusy(device);
pin_set(device->ctrlRS, rs);
pin_low(device->ctrlRW); // write mode
/* configure data pins as output */
databus_output(device);
if(device->fourBit){
// High nibble first
writeNibble(device,data>>4,4);
toggle_e(device);
// Low nibble last
writeNibble(device,data,4);
toggle_e(device);
/* all data pins high (inactive) */
for(uint8_t pin=4; pin<8; pin++){
pin_high(device->data[pin]);
}
}else{
