fugitivus

habe den timer auf 600Hz warte jetzt mit einem flag die halbe bitzeit dennoch kommt nur müll raus... was mach ich falsch ?

Code:

#include <avr/io.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <util/delay.h>

#include "init.h"
#include "lcd.h"


//SoftUART PINS
#define RXPIN 2
#define RXINT INT0
#define UARTDDR DDRD
#define UARTPIN PIND
#define UARTPORT PORTD
#define T0REL 152

char iOut[20];

unsigned char bitFlag = 0;
unsigned char bitCnt = 0;
unsigned char udr = 0;


void cfgInt0(void)
{
    MCUCR |= (1<<ISC01);        //INT0 falling edge
    GICR |= (1<<INT0);            //INT0 interrupt enable
}

void cfgTimer0(void)
{
    TCNT0 = T0REL;
    TCCR0 |= (1<<CS02);
    //TIMSK |=(1<<TOIE0);
}

void cfgSoftUart(void)
{
    UARTDDR &=~ (1<<RXPIN);        //RX Pin als Input
    UARTPORT &=~ (1<<RXPIN);    //RX Pin auf 0

    cfgInt0();                    //Software Uart Interrupt
    cfgTimer0();                //Software Uart Timer
}


int main(void)
{
    cfgPorts();
    cfgSoftUart();
    cfgLcd(LCD_ON_CURSOR_OFF);
    lcdCls();
    enableInterrupts();

    _delay_ms(200);
    lcdPrint("Software Uart",1,1);

    while(1)

    {    
        itoa(udr,iOut,10);
        lcdPrint("                    ",1,3);
        lcdPrint(iOut,1,3);
        itoa(udr,iOut,2);
        lcdPrint(iOut,5,3);
        
        _delay_ms(1000);
    }
      return 0;
}


ISR(INT0_vect)
{
    GICR &=~ (1<<INT0);
    TCNT0 = T0REL;
    TIMSK |=(1<<TOIE0);
}

ISR(TIMER0_OVF_vect)
{
    TCNT0 = T0REL;
    if(bitFlag == 0)
    {
        bitFlag = 1;
    }else 
    {
        bitFlag = 0;
        if(!(PIND & (1 << PD2)))
        {
            udr &=~ (1<<bitCnt++);
        }else
        {
            udr |= (1<<bitCnt++);
        }

        if(bitCnt == 7)
        {
            bitCnt = 0;
            TIMSK &=~(1<<TOIE0);
            GIMSK |= (1<<INT0);
        }
    }
}

mfg Fugitivus