LCD_Routine_atmega32

[cler (Gast)]

Hallo!

Habe ein Problem bezüglich einer LCD_Routine.

Und zwar: Es wird zwar der einzelne Buchstabe angezeigt, jedoch wird 
dieser  von der angegebenen Position verschoben.


Meine Frage ist daher: Was mach ich falsch?

Takt: 4 MHz
LCD_display: HD44780 2 zeilig
AVR: atmega32

Pinkonfigurationen:

DB7...PC7
 6      6
 5      5
 4      4
EN     PC2
RW     GND
RS      3


Da ich das Busyflag nicht abfragen kann, musste ich dies durch 
Delayfunktionen lösen.

siehe Quellcode:

//LCD
void    _long_delay(void);
void    _lcd_write_command(unsigned char);
void    LCD_Write(unsigned char *);
void    LCD_Init(void);
char    LCD_Putchar(char);
#define LCD_Clear  {_lcd_write_command(0x01); _long_delay();_long_delay();}
void    LCD_Gotoxy(unsigned char  , unsigned char );
void    LCD_Gotoxy2(unsigned char  , unsigned char );
void    LCD_DezAusgabe(unsigned long wert , char stellen , unsigned char punkt);
void LCD_Puts(const char *s);


void _long_delay(void)
{
long t = 3000;
while (t--);
}

void _short_delay(void)
{
int t = 350;
while (t--);
}


void _lcd_write_command(unsigned char data)
{
  DDRC |= (0x80+0x40+0x20+0x10+0x08);
  LCD_PORT_w = (data & 0xf0) | DISPLAY_EN;
  LCD_PORT_w = (data & 0xf0) | DISPLAY_EN;
  LCD_PORT_w = (data & 0xf0) | DISPLAY_EN;
  LCD_PORT_w = (data & 0xf0);
  LCD_PORT_w = (data & 0xf0);
  LCD_PORT_w = (data & 0xf0);
  LCD_PORT_w = (data << 4) | DISPLAY_EN;
  LCD_PORT_w = (data << 4) | DISPLAY_EN;
  LCD_PORT_w = (data << 4) | DISPLAY_EN;
  LCD_PORT_w = (data << 4);
    DDRC &= ~(0x80+0x40+0x20+0x10+0x08);
   PORTD &= ~0x08;
 
}

void _lcd_write_4bit(unsigned char data)
{
 DDRC |= (0x80+0x40+0x20+0x10+0x08);
  LCD_PORT_w = (data << 4) | DISPLAY_EN;
  LCD_PORT_w = (data << 4) | DISPLAY_EN;
  LCD_PORT_w = (data << 4) | DISPLAY_EN;
  LCD_PORT_w = (data << 4);
  LCD_PORT_w = (data << 4);
    DDRC &= ~(0x80+0x40+0x20+0x10+0x08);
 PORTD &= ~0x08;
 
}

void lcd_write_byte(unsigned char data)
{
 DDRC |= (0x80+0x40+0x20+0x10+0x08);
  LCD_PORT_w = (data & 0xf0) | DISPLAY_EN | DISPLAY_RS;
  LCD_PORT_w = (data & 0xf0) | DISPLAY_EN | DISPLAY_RS;
  LCD_PORT_w = (data & 0xf0) | DISPLAY_RS;
  LCD_PORT_w = (data & 0xf0) | DISPLAY_RS;
  LCD_PORT_w = (data << 4)   | DISPLAY_EN | DISPLAY_RS;
  LCD_PORT_w = (data << 4)   | DISPLAY_EN | DISPLAY_RS;
  LCD_PORT_w = (data << 4)   | DISPLAY_RS;
    DDRC &= ~(0x80+0x40+0x20+0x10+0x08);
 PORTD &= ~0x08;
 
}


int my_pput(int zeichen)
{
 lcd_write_byte((char) zeichen);
 return(1);
}

// initialize the LCD controller
void LCD_Init(void)
{

LCD_PORT_DDR = 0xff;// - (0x01 + 0x02) ;//0xf0 | DISPLAY_RS | DISPLAY_EN;
_long_delay();
_long_delay();
_lcd_write_4bit(0x03);     // noch 8 Bit
_long_delay();
_lcd_write_4bit(0x03);     // noch 8 Bit
_long_delay();
_lcd_write_4bit(0x03);     // noch 8 Bit
_long_delay();
_lcd_write_4bit(0x02);     // jetzt 4 Bit
_long_delay();

_lcd_write_command(0x28);     // 4 Bit Zweizeilig
//-
_long_delay();
_long_delay();
_lcd_write_command(0x1C);     
_long_delay();
_lcd_write_command(0x74);     
_long_delay();
_lcd_write_command(0x52);     // 
_long_delay();
_lcd_write_command(0x69);     // Contrast 

// ----------------------------
//-
_long_delay();
_lcd_write_command(0x08);     // Display aus
_long_delay();
_lcd_write_command(0x01);     // Clear
_long_delay();
_lcd_write_command(0x06);     //Entry mode
_long_delay();
_lcd_write_command(0x08 + 4); // Display an
_long_delay();
}


void LCD_Gotoxy(unsigned char x , unsigned char y)
 {
  _short_delay();
  switch(y)
  { case 0 : _lcd_write_command(x + 0x80); break;
    case 1 : _lcd_write_command(x + 0xC0); break;
    case 2 : _lcd_write_command(x + (0x80 + 20)); break;
    case 3 : _lcd_write_command(x + (0xC0 + 20)); break;
  }
  
}


void LCD_Write(unsigned char *this_text)
{
 unsigned char i = 0;
  
 while(this_text[i] != 0) 
  {
   lcd_write_byte(this_text[i++]);
   _long_delay();
   
  }
    
  
}


char LCD_Putchar(char zeichen)
{
_short_delay();
 lcd_write_byte((char) zeichen);
 return(1);
}
void LCD_Puts(const char *s)
{
   register char c;

    while ( (c = *s++) ) {
        LCD_Putchar(c);
    }
}



int main()
{
LCD_Init();
LCD_Clear;
LCD_Gotoxy(0,0);
LCD_Puts("Hallo Welt");
for(;;)
{
}
return 0;
}

[Stefan B. (Gast)]

> Und zwar: Es wird zwar der einzelne Buchstabe angezeigt, jedoch wird
> dieser von der angegebenen Position verschoben.

Wundert mich, weil du im angegebenen Programm nur eine Ausgabe eines 
Textes (Hallo Welt") machst und keinen einzelnen Buchstaben aus gibst.