#define F_CPU 9216000UL
#include <avr/io.h>
#include <util/delay.h>

#define BAUDRATE 230400
#define BAUD_PRESCALLER 8

//Declaration of our functions

void USART_init(void);
unsigned char USART_receive(void);
void USART_send( unsigned char data);
void USART_putstring(char* StringPtr);

char String[]="Hello world!!";    //String[] is in fact an array but when we put the text between the " " symbols the compiler threats it as a String and automatically puts the null termination character in the end of the text

int main(void){
	USART_init();        //Call the USART initialization code

	while(1){        //Infinite loop
		USART_putstring(String);    //Pass the string to the USART_putstring function and sends it over the serial
		_delay_ms(5000);        //Delay for 5 seconds so it will re-send the string every 5 seconds
	}

	return 0;
}

void USART_init(void){

	UCSR0A = (1<<U2X0);
	UBRR0H = (uint8_t)(BAUD_PRESCALLER>>8);
	UBRR0L = (uint8_t)(BAUD_PRESCALLER);
	UCSR0B = (1<<RXEN0)|(1<<TXEN0);
	UCSR0C = (3<<UCSZ00);
}

unsigned char USART_receive(void){

	while(!(UCSR0A & (1<<RXC0)));
	return UDR0;

}

void USART_send( unsigned char data){

	while(!(UCSR0A & (1<<UDRE0)));
	UDR0 = data;

}

void USART_putstring(char* StringPtr){

	while(*StringPtr != 0x00){
		USART_send(*StringPtr);
	StringPtr++;}

}