Added usage of the parity function in demo/main

avr_usart.c

@@ -25,6 +25,10 @@ int main() {
 
     init_usart0(); 
 
+    //enable parity, because the internal 
+    //crystal is garbage
+    serial0_enable_parity_bit(2);
+
     //enable interrupts
     sei();
     unsigned char data[8] = "AT+BAUD3";
@@ -210,8 +214,9 @@ void serial0_set_stop_bits(uint8_t number) {
             UCSR0C |= (1<<USBS0);
         default:
             ;
-}
 
+    }
+}
 
 
 /*