I2C-Test with oscilloscope

Hello,

I have a atmega328 which I want to test with a MLX90614 temperature sensor. Unfortunately the sensor is not available on simulide so I thought of measuring the SCL and SDA lines with an oscillosope.

In the following you can see my code.

Code:



#define F_CPU 1000000UL
#include <avr/io.h>
#include <util/delay.h>

void BusWaitForFlagToBeSet()
{
   while(!(TWCR & (1<<TWINT))); // Wait for Flag to be set
}
void BusClearFlagandEnable ()
{
    TWCR=(1<<TWINT) | (1<<TWEN); //Clear Flag and Enable
}
void Bus_StartOrRestart ()
{
   TWCR= (1<<TWEN) | (1<<TWINT) | (1<<TWSTA);
}
void BusClearFlagandEnablewithACK ()
{
   TWCR= (1<<TWINT) | (1<<TWEN) | (1<<TWEA);
}


int main(void)
{
   DDRC=0xFF;
   //Initalizie Bus
   PRR &= ~(1<<PRTWI); // Turn off power reduction so I2C is not disabled
   TWCR &= ~(1<<TWIE); // Turn of Interrupt Enable
   TWBR=2;  // Set the Bit Rate Register at 2 for 1MHz CPU Clock and SCL Clock at 50kHz
   TWSR &= ~(1<<TWPS1)| (1<<TWPS0); // No Prescaler
   //Start Condition
   Bus_StartOrRestart ();
   BusWaitForFlagToBeSet();
   //Send Slave-Adress+W,only one sensor: 0x00
   TWDR=0x00;
   BusClearFlagandEnable ();
   BusWaitForFlagToBeSet();
   // Write Data (Register Adress), Command
   TWDR=0x07;
   BusClearFlagandEnable ();
   BusWaitForFlagToBeSet();
   //Repeat Start
   Bus_StartOrRestart ();
   BusWaitForFlagToBeSet();
   //Send Slave Adress and R, one sensor: 0x00
   TWDR=0x00;
   BusClearFlagandEnable ();
   BusWaitForFlagToBeSet();
   //Read Data  Byte Low
   uint8_t data1 =0;
   data1=TWDR;
   BusClearFlagandEnable ();
   BusWaitForFlagToBeSet();



   //Read Data  Byte High
   uint8_t data2 =0;
   data2=TWDR;
   BusClearFlagandEnable ();
   BusWaitForFlagToBeSet();
    uint8_t data=(data2<<8)+data1;
   //Stop Condition
   TWCR=(1<<TWINT)|(1<<TWEN)|(1<<TWSTO);
 
    while (1)
    {
    }

}



But on the simulation nothing happens. Can anyone tell me where my mistake is?