Atmega328 Uart , Stream nicht zum entschlüsseln

#define BAUDRATE 9600

#define BAUD_PRESCALLER (((F_CPU / (BAUDRATE * 16UL))) - 1)

//---------------------------------

// initialize uart

//---------------------------------

    UBRR0H = (uint8_t)(BAUD_PRESCALLER>>8);

    UBRR0L = (uint8_t)(BAUD_PRESCALLER);

    UCSR0B = (1<<RXEN0)|(1<<TXEN0);

    UCSR0C = (3<<UCSZ00);

for(uint8_t i=0; i<6; i++){

            USART_putstring("Reading channel ");

            USART_send('0' + i);            //This is a nifty trick when we only want to send a number between 0 and 9

            USART_putstring(" : ");            //Just to keep things pretty

            uint16_t adc_value = read_adc(i);        //Read one ADC channel

            itoa(adc_value, buffer, 10);        //Convert the read value to an ascii string

            USART_putstring(buffer);        //Send the converted value to the terminal

            USART_putstring("  ");            //Some more formatting

            _delay_ms(500);                //You can tweak this value to have slower or faster readings or for max speed remove this line

        }