USART.c

/*
* USART.C
*
* Created: 05.02.2021 13:05:49
*  Author: RedBull
*/
#define F_CPU 16000000UL // System clock
#define USART_BAUDRATE 9600 // desired baud rate
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1) // UBRR value
#include <avr/io.h>
#include "USART.h"
#include <util/setbaud.h>

void initUSART(void) { /* requires BAUD */
	UBRR0H = UBRRH_VALUE; /* defined in setbaud.h */
	UBRR0L = UBRRL_VALUE;
	#if USE_2X
	UCSR0A |= (1 << U2X0);
	#else
	UCSR0A &= ~(1 << U2X0);
	#endif
	/* Enable USART transmitter/receiver */
	UCSR0B = (1 << TXEN0) | (1 << RXEN0);
	UCSR0C = (1 << UCSZ01) | (1 << UCSZ00); /* 8 data bits, 1 stop bit */
}
void transmitByte(uint8_t data) {
	/* Wait for empty transmit buffer */
	loop_until_bit_is_set(UCSR0A, UDRE0);
	UDR0 = data; /* send data */
}
uint8_t receiveByte(void) {
	loop_until_bit_is_set(UCSR0A, RXC0); /* Wait for incoming data */
	return UDR0; /* return register value */
}
// Example of a useful printing command
void printString(const char myString[]) {
	uint8_t i = 0;
	while (myString[i]) {
		transmitByte(myString[i]);
		i++;
	}
}

void printByte(uint8_t byte) {
	/* Converts a byte to a string of decimal text, sends it */
	transmitByte('0' + (byte / 100));                        /* Hundreds */
	transmitByte('0' + ((byte / 10) % 10));                      /* Tens */
	transmitByte('0' + (byte % 10));                             /* Ones */
}

void printWord(uint16_t word) {
	transmitByte('0' + (word / 10000));                 /* Ten-thousands */
	transmitByte('0' + ((word / 1000) % 10));               /* Thousands */
	transmitByte('0' + ((word / 100) % 10));                 /* Hundreds */
	transmitByte('0' + ((word / 10) % 10));                      /* Tens */
	transmitByte('0' + (word % 10));                             /* Ones */
}