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#include <avr/io.h>
#include <inttypes.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include "main.h"
#include "rs232.h"

volatile uint8_t read_index, write_index;
volatile uint8_t rs232_buffer[16];

ISR(USART_RXC_vect)
{
        rs232_buffer[write_index++] = UDR;
        write_index &= 15;
}

void RS232_init (void)
{
        UCSRB = (1<<RXEN)|(1<<TXEN)|(1<<RXCIE);
//      UBRRL = 7;              // 57600 Baud @ 7,372800 MHz
//      UBRR = 7;               // 57600 Baud @ 7,372800 MHz

        UBRR=(F_CPU / (BAUD_RATE * 16L) - 1);
}

uint8_t RS232_get (void)
{
        uint8_t c;

        rs232_timer = 10;
       
        while ((read_index == write_index) && (rs232_timer > 0));
        if (rs232_timer != 0)
        {
        c = rs232_buffer[read_index++];
        read_index &= 15;
        }
        else
        {
                c=0;
        }
        return c;
}
void RS232_send (uint8_t data)
{
//      while ((UCSRA & (1<<UDRE)) == 0);
        while ((USR & (1<<UDRE)) == 0);
        UDR = data;
}
void RS232_text (uint8_t *text)
{
        while (*text)
        {
                RS232_send(*text);
                text++;
        }
}