/*
 * UART_InputCapture_Mittelwert_neu.c
 *
 * Created: 17.07.2016 08:33:32
 * Author : BC
 */ 

#define F_CPU 8000000UL

#include <avr/io.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <util/delay.h>

#include "lcd-routines.h"
#include "uart.h"

#define UART_BAUD_RATE 9600L


#define TRUE 1
#define FALSE 0

volatile unsigned char Overflow = 0;
volatile unsigned int StartTime= 0;
volatile unsigned int EndTime = 0; 
volatile float Erg = 0;
volatile float Summe = 0;
uint8_t AnzahlMessung = 50; //hier die Anzahl der Messung ändern

static unsigned char UpdateDisplay = FALSE;
static unsigned char ErsteFlanke = TRUE;



ISR ( TIMER1_CAPT_vect)
{//start ICP-Interrupt
	
	
	
	if (UpdateDisplay)
	{//start if-UpdateDiplay		
		return; //zurück zu main		
	}//end if-UpdateDisplay
	
	else
	{//start else UpdateDisplay
		

		
		for (uint8_t iMessung = 0; iMessung < AnzahlMessung; iMessung++)
		{//start for iMessung	
					
			if (ErsteFlanke == TRUE)
			{//start if-ErsteFlanke
							
				StartTime = ICR1; //Timerwert in StartTime sichern
				Overflow = 0; 
				ErsteFlanke = FALSE; //ErsteFlanke beendet			
			}//end if-ErsteFlanke
		
			else
			{//start else-ErsteFlanke
				EndTime = ICR1; //Timerwert in EndTime sichern
			
				Erg = (Overflow * 65536) + EndTime - StartTime; //allg. Formel
			
				Erg = F_CPU/Erg; //f=1/t
			
				Summe += Erg;
				
				Erg = 0;						
				ErsteFlanke = TRUE;		
			}//end else-ErsteFlanke
			
		}//end for iMessung
		
		UpdateDisplay = TRUE;
		
	}//end else UpdateDisplay
	
	
}//end ICP-Interrupt


ISR( TIMER1_OVF_vect )
{//start OVF-Interrupt
	Overflow++;
}//end OVF-Interrupt



int main(void)
{//start main
    
	DDRC = 0xFF; //PortC als Ausgang
	
	
	
 	lcd_init(); //Initialisierung des LC-Displays
 	uart_init(UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU)); //Initialisierung der UART-Schnittstelle
	
	TCCR1B	=	(1<<ICES1)	| (1<<CS10); // Input-Capture-Edge-Select (0=fallende Flanke, 1=steigende Flanke), kein PreScale
	TIMSK	=	(1<<TICIE1)	| (1<<TOIE1); //Interrupts aktivieren, Overflow-interrupt-enable
	
	sei(); //Global interrupt enable 
	
    while (1) 
    {//start main while
		PORTC = 0xFF; //Betriebs-LED ein
		
		
		if (UpdateDisplay == TRUE)
		{//start if-UpdateDisplay
			
			Summe /= AnzahlMessung; 
			
			char lcdCounterString[8];
			
			dtostrf(Summe, 8, 3, lcdCounterString);
			
 			uart_puts(lcdCounterString);
 			uart_putc('\n');
 			
 			lcd_setcursor(1,1);				// Zeile,Spalte
 			lcd_string(" f[Hz]= ");				// f[Hz]
 			lcd_setcursor(1,9);				// Zeile, Spalte
 			lcd_string(lcdCounterString);			// f in Hz
 			lcd_setcursor(9,3);
 			lcd_string("FEV15");
 			lcd_setcursor(9,4);
 			lcd_string("Team-NFA");
			
			Summe = 0;
			UpdateDisplay = FALSE;
		}//end if-UpdateDisplay
		
    }//end main while
}//end main