// PURPOSE: Initialize LCD to 4 bit I/O mode
void HD44780::lcd_init()
{
// configure all port bits as output (LCD data and control lines on different ports
LCD_DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
LCD_DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
LCD_DDR(LCD_4BIT_D4_PORT) |= _BV(LCD_4BIT_D4_PIN);
LCD_DDR(LCD_4BIT_D5_PORT) |= _BV(LCD_4BIT_D5_PIN);
LCD_DDR(LCD_4BIT_D6_PORT) |= _BV(LCD_4BIT_D6_PIN);
LCD_DDR(LCD_4BIT_D7_PORT) |= _BV(LCD_4BIT_D7_PIN);
// wait 25ms or more after power-on
fcpu_delay_us(25000);
// initial write to lcd is 8bit
LCD_4BIT_D5_PORT |= _BV(LCD_4BIT_D5_PIN); // _BV(LCD_FUNCTION)>>4;
LCD_4BIT_D4_PORT |= _BV(LCD_4BIT_D4_PIN); // _BV(LCD_FUNCTION_8BIT)>>4;
lcd_toggle_e();
fcpu_delay_us(2000); //2000 // delay, busy flag can't be checked here
// repeat last command
lcd_toggle_e();
fcpu_delay_us(64); //64 // delay, busy flag can't be checked here
// now configure for 4bit mode
LCD_4BIT_D4_PORT &= ~_BV(LCD_4BIT_D4_PIN); // LCD_FUNCTION_4BIT_1LINE>>4
lcd_toggle_e();
fcpu_delay_us(2000); // some displays need this additional delay
// set 4 bit IO
lcd_instr(LCD_FUNCTION_4BIT_2LINES); // 4-bit interface, dual line, 5x7 dots
lcd_toggle_e();
fcpu_delay_us(2000); // some displays need this additional delay
lcd_instr(LCD_ENTRY_INC_);//cursor move right, no shift display
lcd_toggle_e();
fcpu_delay_us(2500); // some displays need this additional delay
lcd_instr(LCD_DISP_ON);// display on, cursor off, blink char off
lcd_toggle_e();
fcpu_delay_us(2500); // some displays need this additional delay
lcd_home();//set cursor to home and clear the cursor
}
//-----------------------------------------------------------------------------------------
// FUNCTION: lcd_newline
// PURPOSE: Move cursor on specified line
void lcd_setline(uint8_t line)
{
uint8_t addressCounter = 0;
switch(line)
{
case 0: addressCounter = LCD_START_LINE1; break;
case 1: addressCounter = LCD_START_LINE2; break;
case 2: addressCounter = LCD_START_LINE3; break;
case 3: addressCounter = LCD_START_LINE4; break;
default:addressCounter = LCD_START_LINE1; break;
}
g_nCurrentLine = line;
lcd_instr((1<<LCD_DDRAM)+addressCounter);
}
//-----------------------------------------------------------------------------------------
// FUNCTION: lcd_gotoxy
// PURPOSE: Set cursor to specified position
// Input: x horizontal position (0: left most position)
// y vertical position (0: first line)
void lcd_gotoxy(uint8_t x, uint8_t y)
{
#if LCD_LINES==1
lcd_instr((1<<LCD_DDRAM)+LCD_START_LINE1+x);
#elif LCD_LINES==2
switch (y)
{
case 0:lcd_instr((1<<LCD_DDRAM)+LCD_START_LINE1+x);break;
case 1:lcd_instr((1<<LCD_DDRAM)+LCD_START_LINE2+x);break;
default: break;
}
#elif LCD_LINES==4
switch (y)
{
case 0:lcd_instr((1<<LCD_DDRAM)+LCD_START_LINE1+x);break;
case 1:lcd_instr((1<<LCD_DDRAM)+LCD_START_LINE2+x);break;
case 2:lcd_instr((1<<LCD_DDRAM)+LCD_START_LINE3+x);break;
case 3:lcd_instr((1<<LCD_DDRAM)+LCD_START_LINE4+x);break;
default: break;
}
#endif
}
/* Initialisierung des Display's 4-BIT , 2 Zeilen */
int lcd_init(void)
{
int ret;
ret = iic_tx_pcf8574(8,PCF_ADRESS); // BL EIN RS/RW 0
usleep(15000);
ret=lcd_write_nibble(LCD_IR,0x03);
usleep(5000);
ret=lcd_write_nibble(LCD_IR,0x03);
usleep(200);
ret=lcd_write_nibble(LCD_IR,0x03);
usleep(50);
ret=lcd_write_nibble(LCD_IR,0x02);
ret=lcd_instr(0x28); // 4 BIT-Mode , 2 Zeilen
ret=lcd_instr(LCD_OFF); // LCD_Off
ret=lcd_instr(LCD_CLR); // LCD_Clear
ret=lcd_instr(0x02); // Cursor an 1. Stelle
ret=lcd_instr(0x06); // Cursor Richtung +1
ret=lcd_instr(0x0E); // Display an , Cursor klein , kein Blinken
lcd_ADRESS=0; // Aktuelle Adresse = 0
lcd_BACKLIGHT=1; // Licht ein
lcadr=0;
return ret;
}
//-----------------------------------------------------------------------------------------
// FUNCTION: lcd_home
// PURPOSE: Set cursor to home position
void lcd_home(void)
{
g_nCurrentLine = 0;
lcd_instr(1<<LCD_HOME);
}
//-----------------------------------------------------------------------------------------
// FUNCTION: lcd_clrscr
// PURPOSE: Clear display and set cursor to home position
void lcd_clrscr(void)
{
g_nCurrentLine = 0;
lcd_instr(1<<LCD_CLR);
_delay_us(500);
}
// PURPOSE: Set cursor to home position
void HD44780::lcd_home(void)
{
//g_nCurrentLine = 0;
lcd_instr(1<<LCD_HOME);
lcd_setline(0);
}
// PURPOSE: Clear display and set cursor to home position
void HD44780::lcd_clrscr(void)
{
g_nCurrentLine = 0;
lcd_instr(1<<LCD_CLR);
fcpu_delay_us(500);
}
