msaynevirta / GPS tracker - Files

usart.c
#include <avr/io.h>
#include <stdlib.h>
#include "usart.h"
#define USART_BAUDRATE 115200
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1



int main()
{
    
    USART_init();
    for(;;) // continuous loop
    {
       unsigned char ReceivedByte = USART_receive();
       USART_transmit(ReceivedByte);
    }
}

// Initialize USART 
void USART_init()
{
    UCSR1B = (1 << RXEN1) | ( 1<< TXEN1);     // Enable Receiver and Transmitter
    UCSR1C = (1 << UMSEL11) | (1 << UCSZ11) | (1 << UCSZ10);   // use 8-bit character sizes 

    UBRR1L = (uint8_t)(BAUD_PRESCALE);       // Load lower 8-bits of the baud rate
    UBRR1H = (uint8_t)(BAUD_PRESCALE >> 8);  // Load upper 8-bits
}

// function to receive data
unsigned char USART_receive(void)
{
    while(!(UCSR1A) & ( 1<< RXC1))  // wait while data is being received
        return UDR1;                // return the value of the received data stored in UDR
}

// function to send data
void USART_transmit(unsigned char data)
{
    while ((UCSR1A & (1 << RXC1)) == 0)  // Wait till data is received and is ready to be read from UDR
        UDR1 = data;                     // load the 8-bit data into the UDR
}