/*
writedata - Output a byte to the LCD display data register
*/
void writedata(unsigned char x)
{
PORTB |= (1<<PB0);//sets RS as 1 for data
writenibble(x);
writenibble(x<<4);
_delay_ms(2);
}
void init_lcd()
{
DDRD &= ~((1<<PD4)|(1<<PD5)|(1<<PD6)|(1<<PD7));//clear register D
DDRD |= ((1<<PD4)|(1<<PD5)|(1<<PD6)|(1<<PD7));//sets D4-D7 as output; used for sending bits
DDRB &= ~((1<<PB0)|(1<<PB1));//clear register B
DDRB |= ((1<<PB0)|(1<<PB1));//sets D8 & D9 as output; PB0/D8 used for Register Select(RS), PB1/D9 used for Enable
_delay_ms(15);
PORTB &= ~(1<<PB0); // Delay at least 15ms
writenibble(0b00110000);
// Use writenibble to send 0011
_delay_ms(5); // Delay at least 4msec
writenibble(0b00110000);
// Use writenibble to send 0011
_delay_us(100); // Delay at least 100usec
writenibble(0b00110000);
// Use writenibble to send 0011, no delay needed
writenibble(0b00100000);
// Use writenibble to send 0010 // Function Set: 4-bit interface
_delay_ms(2);
writecommand(0x28); // Function Set: 4-bit interface, 2 lines
writecommand(0x0f); // Display and cursor on
_delay_ms(2);
}
/*
init_lcd - Do various things to initialize the LCD display
*/
void init_lcd()
{
DDRD |= (1 << PD7) | (1 << PD6) | (1 << PD5) | (1 << PD4); // initialize data lines
DDRB |= (1 << PB1) | (1 << PB0); // initialize Reg select & Enable
_delay_ms(15); // Delay at least 15ms
// Use writenibble to send 0011
writenibble(0x30);
_delay_ms(5); // Delay at least 4msec
// Use writenibble to send 0011
writenibble(0x30);
_delay_us(120); // Delay at least 100usec
// Use writenibble to send 0011, no delay needed
writenibble(0x30);
// Use writenibble to send 0010 // Function Set: 4-bit interface
writenibble(0x20);
_delay_ms(2);
writecommand(0x28); // Function Set: 4-bit interface, 2 lines
_delay_ms(2);
writecommand(0x0F); // Display and cursor on
_delay_ms(2);
}
/*
writecommand - Output a byte to the LCD display instruction register.
*/
void writecommand(unsigned char x)
{
PORTB &= ~(1<<PB0);//sets RS as 0 for command
writenibble(x);
writenibble(x<<4);
_delay_ms(2);
}
/*
writedata - Output a byte to the LCD display data register
*/
void writedata(unsigned char x)
{
PORTB |= (1 << PB0);//set register select to 1 (data register)
writenibble(x);//send 4 msb in first (lsb cleared to 0 in writenibble)
writenibble(x << 4);//shift left logical by 4 to send in lsb
_delay_ms(2);
}
/*
writecommand - Output a byte to the LCD display instruction register.
*/
void writecommand(unsigned char x)
{
PORTB &= ~(1 << PB0); // set RS = 0, for the command register
writenibble(x); // read the upper 4 bits
writenibble(x << 4); // read lower 4 bits
_delay_ms(2);
}
/*
writedata - Output a byte to the LCD display data register
*/
void writedata(unsigned char x)
{
PORTB |= (1 << PB0); // set RS = 1, for the data register
writenibble(x); // read the upper 4 bits
x = (x << 4); // shift lower 4 bits
writenibble(x); // read lower 4 bits
_delay_ms(2);
}
/*
writebyte - Output a byte to the LCD display instruction register.
*/
void writebyte(unsigned char x, unsigned char rs) {
if(rs == 0x00) {
PORTB &= ~(0x01);
} else {
PORTB |= 0x01;
}
// Set upper and lower bits
unsigned char upper = ((x & 0xF0) >> 4);
unsigned char lower = (x & 0x0F);
// Write upper bits
writenibble(upper);
// Write lower bits
writenibble(lower);
// Delay to finish
_delay_ms(2);
}
/*
init_lcd - Do various things to initialize the LCD display
*/
void init_lcd()
{
DDRD |= (1 << PD7);//configure port as output
DDRD |= (1 << PD6);
DDRD |= (1 << PD5);
DDRD |= (1 << PD4);
DDRB |= (1 << PB0);
DDRB |= (1 << PB1);
_delay_ms(15); // Delay at least 15ms
writenibble(0x30); // Use writenibble to 78send 0011
_delay_ms(5); // Delay at least 4msec
writenibble(0x30); // Use writenibble to send 0011
_delay_us(120); // Delay at least 100usec
writenibble(0x30); // Use writenibble to send 0011, no delay needed
writenibble(0x20); // Use writenibble to send 0010 // Function Set: 4-bit interface
_delay_ms(2);
writecommand(0x28); // Function Set: 4-bit interface, 2 lines
_delay_ms(2);
writecommand(0xf0); // Display and cursor on
_delay_ms(2);
}
/*
init_lcd - Do various things to initialize the LCD display
*/
void init_lcd()
{
_delay_ms(15); // Delay at least 15ms
writenibble(0b00110000);
// Use writenibble to send 0011
_delay_ms(5); // Delay at least 4msec
writenibble(0b00110000);
// Use writenibble to send 0011
_delay_us(120); // Delay at least 100usec
writenibble(0b00110000);
// Use writenibble to send 0011, no delay needed
writenibble(0b00100000);
// Use writenibble to send 0010 // Function Set: 4-bit interface
_delay_ms(2);
writecommand(0x28); // Function Set: 4-bit interface, 2 lines
writecommand(0x0f); // Display and cursor on
writecommand(1);
}
/*
init_lcd - Do various things to initialize the LCD display.
*/
void init_lcd() {
_delay_ms(15); // Delay at least 15ms
writenibble(0x03); // Use writenibble to send 0011
_delay_ms(5); // Delay at least 4msec
writenibble(0x03); // Use writenibble to send 0011
_delay_us(120); // Delay at least 100usec
writenibble(0x03); // Use writenibble to send 0011
writenibble(0x02); // Use writenibble to send 0010
_delay_ms(2);
writebyte(0x28, 0x00); // Function Set: 4-bit interface, 2 lines
_delay_ms(2);
writebyte(0x0F, 0x00); // Display and cursor on
_delay_ms(2);
clear(); // Clear everything
PORTB |= 0x04; // Enable backlight
}
