void setup_LCD() {
uint8_t i;
// wait 50ms for LCD to come up
Delay(50);
// reset pins to all 0
send_LCD(0);
DelayUS(4500);
for(i = 0; i < 3; i++) { // try three times to set LCD into a known state (re-sync half-byte stream)
// start by setting 8 bit mode
send_halfbyte(LCD_FUNCTIONSET|LCD_8BITMODE);
DelayUS(4500); // wait a minimum of 4.1ms
}
// set in 4 bit mode
send_halfbyte(LCD_FUNCTIONSET|LCD_4BITMODE);
// set # of lines, font size, etc
send_byte(LCD_FUNCTIONSET|LCD_2LINE|LCD_4BITMODE|LCD_5x8DOTS, 0);
// TODO: does this need a modifier?
// turn on display
send_byte(LCD_BACKLIGHT|LCD_DISPLAYON|LCD_CURSOROFF|LCD_BLINKOFF, 0);
LCD_clear();
// left to right
send_byte(LCD_ENTRYMODESET|LCD_ENTRYLEFT|LCD_ENTRYSHIFTDECREMENT, 0);
LCD_home();
LCD_print_char('B');
}
/*
Initialize the LCD using proper delays and commands.
*/
void LCD_init( void )
{
// Set pins as outputs
LCDPORT->DIR |= (~LCD_MASK & 0xFFF);
LCDPORT_CTRL_RS->DIR |= (1<<RS);
LCDPORT_CTRL_E->DIR |= (1<<ENABLE);
// Initial delay
_delay_ms( 15 );
// Initial instuctions
unsigned char i;
for (i = 0; i < 3; i++ )
{
LCDPORT->DATA &= LCD_MASK ; //Set used pins to zero
LCDPORT_CTRL_RS->DATA &= ~(1<<RS);
LCDPORT->DATA |= 0x03 << LCD_OFFSET; //And set up the command
_LCD_pulse();
_delay_ms( 5 );
}
// Set 4bit mode
LCDPORT->DATA &= LCD_MASK;
LCDPORT->DATA |= 0x02<<LCD_OFFSET;
_LCD_pulse();
// Set 2-row display
LCD_sendCmd( 0x28 );
// Display off
LCD_sendCmd( 0x08 );
// Clear display
LCD_clear();
// Set incrementmode, no shift
LCD_sendCmd( 0x06 );
// Turn LCD on and set cursor to home
LCD_sendCmd( 0x0C );
LCD_home();
}
uint8 LCD_init(){
i2c_master_start();
i2c_master_writeByte(LCD_ADDRESS << 1);
if (!i2c_master_checkAck()) {
i2c_master_stop();
return 0;
}
i2c_master_stop();
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
if (LCD_ROW > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = LCD_ROW;
// for some 1 line displays you can select a 10 pixel high font
if ((LCD_DOTSIZE != 0) && (LCD_ROW == 1)) {
_displayfunction |= LCD_5x10DOTS;
}
// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
// according to datasheet, we need at least 40ms after power rises above 2.7V
// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
os_delay_us(50000);
// Now we pull both RS and R/W low to begin commands
LCD_expanderWrite(0); // reset expanderand turn backlight off
os_delay_us(1000000);
//put the LCD into 4 bit mode
// this is according to the hitachi HD44780 datasheet
// figure 24, pg 46
// we start in 8bit mode, try to set 4 bit mode
LCD_write4bits(0x30);
os_delay_us(4500); // wait min 4.1ms
// second try
LCD_write4bits(0x30);
os_delay_us(4500); // wait min 4.1ms
// third go!
LCD_write4bits(0x30);
os_delay_us(150);
// finally, set to 4-bit interface
LCD_write4bits(0x20);
// set # lines, font size, etc.
LCD_command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
LCD_display();
// clear it off
LCD_clear();
// Initialize to default text direction (for roman languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
LCD_command(LCD_ENTRYMODESET | _displaymode);
LCD_home();
return 1;
}
