I am trying to learn AVR programming with Arduino. But there is an issue when ı try to activate the usart register bits.
UBRR0H = (BRC >> 8);
UBRR0L = BRC;
UCSR0B |= (1<<TXEN0);
UCSR0C |= (1<<UCSZ01) | (1<<UCSZ01) ;
while(1) //infinite loop
{
UDR0 = 'H';
_delay_ms(1000);
}
When ı use | operator to activate TXEN and Some bit frames it activates and prints 'H' to my Serial port. That is the result that i want!
UCSR0B = (1<<TXEN0);
UCSR0C = (1<<UCSZ01) | (1<<UCSZ01) ;
when ı use like this, I get 'È' to my serial port!
Why is that? What is the problem?
UCSR0C = (1<<UCSZ01) | (1<<UCSZ01);
There might be 2 problems here:
The statement above sets one bit in UCSR0C, notice that UCSZ01 is specified twice. So this might be a typo, but even if not, it's confusing at least.
We don't know which device you are using, so we have to guess here. Assuming it's something like ATmega48/88/168/328, the reset status of UCSR0C is 0b00000110, i.e. bits UCSZ00 and UCSZ01 are set!
Thus UCSR0C = (1<<UCSZ01) will set UCSZ00 to zero, while UCSR0C |= (1<<UCSZ01) does not and UCSZ00 will stay at its previous value.