LCD routinen in C

[_maddin]

vielen dank, habs gleich in die tat umgesetzt, funzt jedoch immer noch nicht.
 

das programm sieht jetzt so aus:

(definitionen......)

//Prototypen
void delay_ms(unsigned int);
void io_init(void);
//LCD
void lcd_data(unsigned char);
void lcd_command(unsigned char);
void lcd_enable(void);
void lcd_init(void);
void lcd_clear(void);

//

//
void main(void) { 
	ioinit();
	lcd_init();
	lcd_data("T");
	lcd_data("e");
	lcd_data("s");
	lcd_data("t");
	while(1);
}



// Initialisierung
void ioinit(void){//0EINGANG 1AUSGANG
	DDRD=0b11100011;
    DDRB=0b00111111;
}

void delay_ms(unsigned int ms){
    unsigned int zaehler;
   
    while (ms) {
        zaehler = F_CPU / 5000;
       
        while (zaehler) {
            asm volatile("nop");
            zaehler--;
        }
        ms--;
    }
}


void lcd_init(){
	LCD_PORT=0xFF;
	delay_ms(31);
	LCD_PORT=0b00000011;//zur initialisierung
	lcd_enable();
	delay_ms(5);
	lcd_enable();
	delay_ms(5);
	lcd_enable();
	delay_ms(5);
	lcd_command(0b00000010);//4bit
	lcd_enable();
	delay_ms(5);
	lcd_command(0b00101000);//4bit,2Zeilen
	delay_ms(5);
	lcd_command(0b00001100);//Display on, Cursor off
	delay_ms(5);
	lcd_command(0b00000100);
}

void lcd_enable(){
	LCD_PORT |= (1 << LCD_E);//1
	delay_ms(1);
	LCD_PORT &=~(1 << LCD_E);//0
	delay_ms(1);
}

void lcd_data(unsigned char data){
	unsigned char nibble;
	nibble=data>>4; //ersatz für "swap"
	LCD_PORT=nibble&00001111;
	LCD_PORT |= (1 << LCD_RS);//1
	lcd_enable();
	LCD_PORT=data&00001111;
	LCD_PORT |= (1 << LCD_RS);//1
	lcd_enable();
	delay_ms(1);
}

void lcd_command(unsigned char data){
	unsigned char nibble;
	nibble=data>>4;
	LCD_PORT=nibble&00001111;
	lcd_enable();
	LCD_PORT=data&00001111;
	lcd_enable();
	delay_ms(1);
}

wenn ich das programm auf den mega32 lade, kommt nur mist raus.
beim compilen kommen diese warnings hier :

ZumExperimentieren.c:44: warning: passing argument 1 of 'lcd_data' makes integer from pointer without a cast
ZumExperimentieren.c:45: warning: passing argument 1 of 'lcd_data'
......

was bedeutet das ???
mfg maddin