#include <stdlib.h>
#include <avr/io.h>
#include <string.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "lcd.h"
#include "uart.h"

#ifndef F_CPU
#define F_CPU 16000000
#endif

#define UART_BAUD_RATE      4800        //Baud = 4800
#define LENGTH 7                                        //Textl�nge ab welcher Empfangen beendet wird

int main(void)
{
	uint8_t i;
	char c;
	char* s;
	char string[LENGTH];
	char gpgga[] = "$GPGGA";

	uart_init(UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU));

	sei();

	lcd_init(LCD_DISP_ON);

	lcd_clrscr();
	lcd_home();
	lcd_puts("Bereit");

	i = LENGTH;
	while(1)
	{
		c = uart_getc();

		if(c == '$')
		{
			i = 1;		//i'tes Zeichen. dh (i-1) Zeichen bereits empfangen
			s = string;
		}

		if(i < LENGTH)
		{
			*s = c;
			s++;
			i++;
		}

		if(i == LENGTH)
		{
			*s = 0x00;	//terminierung

			if(strcmp(gpgga, string) == 0)
			{
				lcd_clrscr();
				lcd_home();
				lcd_puts(string);
				_delay_ms(300);
			}
			else
			{
				lcd_clrscr();
				lcd_home();
				lcd_puts("Noe");
				_delay_ms(300);
			}
			i++;
		}
	}
}