// velocity measurement - target ATmega32

#define XTAL			8e6
#define F_CPU			XTAL

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

#include "..\..\includes\BitUtilities.h"				
#include "..\..\includes\LCD_display_on_Port_C.h"
#include "..\..\includes\LED_display_degrees.h"

// Deklarationen Drehzahlmessung //
volatile double 		sec	  = 0;
volatile double 		n  	  = 0;
volatile double 		n_max = 200;  // Sollwert max. Drehzahl Rotor
volatile unsigned char 	run	  = 0;	  // 0 = stop, 1 = run
volatile unsigned int 	ctr	  = 0;	  // counter latch
char t1[8];							  // text1 for LCD display

// Deklarationen Windgeschwindigkeitsmessung //
#define      calibrator 210.0         // (Anemometer)
char         str2[5];
unsigned int gatetime = 2500;         // in ms
float        value;


ISR (TIMER1_COMPA_vect)		// Compare Match			
{	if (run) {run = 0; ctr =1; sec = 100;}	
}

ISR (TIMER1_CAPT_vect) 		// Capture Event 
{	if (run) {ctr = ICR1; sec = ctr/(F_CPU/256.0); run = 0;}
	else {sbi(PORTB, 0); TCNT1 = 0; run = 1;}
}


int main()
{
// D I S P L A Y - A N Z E I G E //
    lcd_init();

	lcd_send(COMMAND, LCD_CLEAR);
	lcd_send(COMMAND, LCD_CLEAR);
	lcd_set_cursor(1, 0);  lcd_write("R:");
	lcd_set_cursor(1, 5);  lcd_write("rpm");
	lcd_set_cursor(1, 9);  lcd_write("W:");
	lcd_set_cursor(1, 13); lcd_write("m/s");

// I N I T I A L I S I E R U N G   D R E H Z A H L M E S S U N G   R O T O R //
	TIMSK |= (1<<TICIE1) | (1<<OCIE1A);	// input capture & compare match
	OCR1A = F_CPU/128;					// compare for 2 sec
	TCCR1B |= (1<<WGM12) | (1 << CS12);	// CTC mode & Prescaler = 1/256
	sei();

	while (1)		
	{	

// M E S S U N G   W I N D G E S C H W I N D I G K E I T //
      value = 0;             // start counter
	  cbi(DDRB,1);           // PB1 as input
      TCNT1 = 0;             // reset counter
	  // Ext. Clock @ T1, rising edge
	  TCCR1B = (1<<CS02)|(1<<CS01)|(1<<CS00);
	  _delay_ms(gatetime);   // wait one gate period
	  value = TCNT1;
      TCCR1B = 0;            // stop counter
      value = calibrator*value/gatetime;
	  dtostrf(value, 5, 1, str2); lcd_set_cursor(1, 8); lcd_write(str2);


// D R E H Z A H L M E S S U N G   R O T O R //
	  n = 60/sec;
	  if (ctr)						
	  {	cbi(PORTB, 0);
        lcd_set_cursor(1, 2); dtostrf (n, 3, 0, t1); lcd_write (t1);
		ctr = 0;
		DDRB = 0b010000; // PortB4 as output
	    if(n > n_max)
        { PORTB = 0b010000;
        }
	    else
	    { PORTB = 0b000000;
	    }
	  }



    }  // While-Schleife

    return 0;
	
}