void output_byte(uint8_t rs, uint8_t data, uint8_t en)
{
output_nibble(rs, HIGH_NIBBLE(data), en);
output_nibble(rs, LOW_NIBBLE(data), en);
#ifdef HD44780_READBACK
/* wait until command is executed by checking busy flag, with timeout */
/* max execution time is for return home command,
* which takes at most 1.52ms = 1520us */
uint8_t busy, timeout = 200;
do {
busy = input_byte(0,en) & _BV(BUSY_FLAG);
_delay_us(10);
timeout--;
} while (busy && timeout > 0);
#ifdef DEBUG
if (timeout == 0)
debug_printf("lcd timeout!\n");
#endif
#else
/* just wait the maximal time a command can take... */
_delay_ms(2);
#endif
}
void config_lcd_display() {
clear_rs();
clear_rw();
clear_e();
rs_output();
rw_output();
e_output();
config_bus_output();
_delay_ms(15);
output_nibble(0x30);
_delay_ms(6);
output_nibble(0x30);
_delay_ms(2);
output_nibble(0x30);
_delay_ms(2);
output_nibble(0x20);
busy_wait();
write_command_lcd(0x28);
write_command_lcd(0x08);
write_command_lcd(0x01);
write_command_lcd(0x06);
}
static void write_register(uint8_t data, bool register_sel) {
busy_wait();
if(register_sel) set_rs();
else clear_rs();
clear_rw();
config_bus_output();
output_nibble(data);
output_nibble(data << 4);
config_bus_input();
}
void hd44780_init(void)
{
/* verschiedene Hardware initialisieren */
hd44780_hw_init();
_delay_ms(40);
#if HD44780_TYPE == HD44780_KS0066U
/* Hardware initialisiert -> Standardprozedur KS0066U Datenblatt 4bit Mode */
output_nibble(0, 0x02);
#else
/* Hardware initialisiert -> Standardprozedur HD44780 Datenblatt 4bit Mode */
output_nibble(0, 0x03);
_delay_ms(4);
clock_write();
_delay_ms(1);
clock_write();
_delay_ms(1);
output_nibble(0, 0x02); //4bit mode
_delay_ms(1);
/* init done */
#endif
/* configure for 4 bit, 2 lines, 5x9 font (datasheet, page 24) */
output_byte(0, CMD_FUNCTIONSET(0, 1, 0));
/* turn on display, cursor and blinking */
hd44780_config(0,0);
/* clear display */
hd44780_clear();
/* set shift and increment */
output_byte(0, CMD_ENTRY_MODE(1, 0));
/* set ddram address */
output_byte(0, CMD_SETDRAMADR(0));
/* open file descriptor */
lcd = fdevopen(hd44780_put, NULL);
/* set current virtual postion */
current_pos = 0;
}
//push a nibble of data through the the LCD's DB4~7 pins, clocking with the Enable pin.
//We don't care what RS and RW are, here.
void pushNibble(uint8_t value) {
output_nibble(LCD_INTERFACE_PORT, value);
pulseEnablePin();
}
void hd44780_init(void)
{
/* verschiedene Hardware initialisieren */
hd44780_hw_init();
_delay_ms(40);
#if CONF_HD44780_TYPE == HD44780_KS0066U
/* Hardware initialisiert -> Standardprozedur KS0066U Datenblatt 4bit Mode */
output_nibble(0, 0x02, 1);
#else
/* Hardware initialisiert -> Standardprozedur HD44780 Datenblatt 4bit Mode */
output_nibble(0, 0x03,1);
_delay_ms(4);
#ifdef HD44780_2WIRE
output_nibble(0, 0x03,1);
#else
clock_write(1);
#endif /*HD44780_2WIRE*/
_delay_ms(1);
#ifdef HD44780_2WIRE
output_nibble(0, 0x03,1);
#else
clock_write(1);
#endif /*HD44780_2WIRE*/
_delay_ms(1);
output_nibble(0, 0x02,1); //4bit mode
_delay_ms(1);
/* init done */
#endif /*CONF_HD44780_TYPE*/
/* configure for 4 bit, 2 lines, 5x8 font (datasheet, page 24) */
output_byte(0, CMD_FUNCTIONSET(0, 1, 0), 1);
/* turn on display, cursor and blinking */
hd44780_config(0,0,1);
/* clear display */
hd44780_clear(1);
/* set shift and increment */
output_byte(0, CMD_ENTRY_MODE(1, 0),1);
/* set ddram address */
output_byte(0, CMD_SETDRAMADR(0),1);
/*Configure Controller 2 */
#ifdef HD44780_MULTIENSUPPORT
/* verschiedene Hardware initialisieren */
hd44780_hw_init();
_delay_ms(40);
#if CONF_HD44780_TYPE == HD44780_KS0066U
/* Hardware initialisiert -> Standardprozedur KS0066U Datenblatt 4bit Mode */
output_nibble(0, 0x02, 2);
#else
/* Hardware initialisiert -> Standardprozedur HD44780 Datenblatt 4bit Mode */
output_nibble(0, 0x03,2);
_delay_ms(4);
clock_write(2);
_delay_ms(1);
clock_write(2);
_delay_ms(1);
output_nibble(0, 0x02,2); //4bit mode
_delay_ms(1);
/* init done */
#endif
/* configure for 4 bit, 2 lines, 5x9 font (datasheet, page 24) */
output_byte(0, CMD_FUNCTIONSET(0, 1, 0), 2);
/* turn on display, cursor and blinking */
hd44780_config(0,0,2);
/* clear display */
hd44780_clear(2);
/* set shift and increment */
output_byte(0, CMD_ENTRY_MODE(1, 0),2);
/* set ddram address */
output_byte(0, CMD_SETDRAMADR(0),2);
#endif
/* set current virtual postion */
current_pos = 0;
}