Ansteuerung LCD Display an Port C

#define LCD_CLEAR    0x01  // clear display     0b 0000 0001

#define LCD_HOME    0x02  // cursor home      0b 0000 0010

#define LCD_ON      0x0C  // cursor invisible    0b 0000 1100

#define LCD_OFF      0x08  // display off      0b 0000 1000

#define POS_01      0x80  // line 1 - column 0  0b 1000 0000

#define POS_02      0xC0  // line 2 - column 0  0b 1100 0000

#define  LCDPORT      PORTC  // define port with LCD attached

#define  LCDDDR      DDRC  // and its data direction

// define pins of LCD port

#define LCD_PIN_RS    2    

#define LCD_PIN_E    3

#define LCD_PIN_D4    4

#define LCD_PIN_D5    5

#define LCD_PIN_D6    6

#define LCD_PIN_D7    7

// DEFINITIONS

#define sbi(PORT, bit)     (PORT|=(1<<bit))  // set bit        

#define cbi(PORT, bit)     (PORT&=~(1<<bit))  // claear bit

#define tbi(PORT, bit)     (PORT^=(1<<bit))  // toggle bit

#define  COMMAND      0

#define DATA      1

// Function: Toggle enable pin 

void toggle_enable_pin(void)

{

  sbi(LCDPORT, LCD_PIN_E);

  cbi(LCDPORT, LCD_PIN_E);  

}

// Send Byte to LCD Controller

void lcd_send(unsigned char type, unsigned char c)

{

  unsigned char sic_c;          // Backup for c

  // send high nibble

  sic_c = c;                // save original c

  sic_c &= ~0x0f;              // set bit 0-3 == 0

  if (type==DATA)

    sic_c |= (1<<LCD_PIN_RS);      // Data: RS = 1

  LCDPORT = sic_c;            // send high nibble

  toggle_enable_pin();

  // send low nibble

  sic_c = c;                // save original c

  sic_c = sic_c<<4;            // exchange nibbles

  sic_c &= ~0x0f;              // set bit 0-3 == 0

  if (type==DATA)

    sic_c |= (1<<LCD_PIN_RS);      // Data: RS = 1

  LCDPORT = sic_c;            // send low nibble

  toggle_enable_pin();

  _delay_ms(5);              // Wait for LCD controller

}

// set cursor to line x and column y

void lcd_set_cursor(uint8_t x, uint8_t y)

{

  uint8_t i;

  switch (x) 

  {

    case 1: i=0x80+0x00+y; break;    // 1. line

    case 2: i=0x80+0x40+y; break;    // 2. line

    default: return;                   // invalid line

  }

  lcd_send(COMMAND, i);

}

// Display String on LCD

void lcd_write(char *t)

{

  unsigned char i;

  for (i=0;i<255;i++)

  {

    if (t[i]==0) // End of String -> EXIT

      return;

    else 

      lcd_send(DATA, t[i]);

  }

}

// initializing LCD Controller see data sheet for details

void lcd_init()

{

  // Set LCD port to Output

  LCDPORT = 0x00;

  LCDDDR  = 0xFF;

  _delay_ms(50); // wait for LCD

  // 4-bit Modus config

  sbi(LCDPORT, LCD_PIN_D5);

  cbi(LCDPORT, LCD_PIN_D4);

  // 4-Bit mode start 

  sbi(LCDPORT, LCD_PIN_E);

  cbi(LCDPORT, LCD_PIN_E);

  _delay_ms(5); 

  // 2 Lines, 4-Bit Mode

  lcd_send(COMMAND, 0x28);

  lcd_send(COMMAND, LCD_OFF);

  lcd_send(COMMAND, LCD_CLEAR);

  lcd_send(COMMAND, 0x06);

  lcd_send(COMMAND, LCD_ON);

}

int main()

{  lcd_init();

  lcd_send(COMMAND, LCD_CLEAR); ;

  lcd_set_cursor(1, 0); lcd_write (" Test Hallo");

while (1)    

  {  

  }

}