Snippet revisions — Bitbucket

+#include <avr/IO.h>

+#include <util/delay.h>

+#include <avr/interrupt.h>

+char com;

+char oct;

+unsigned int TM = 0;

+unsigned long AN = 0;

+unsigned int last = 0;

+unsigned char cht = 0;

+ISR(TIMER1_CAPT_vect)

+{

+	unsigned int time;

+	time = TCNT1;

+	cht++;

+	if (cht%2 != 0)

+		last = time;

+	else

+		TM = time - last;

+}

+void lcd(unsigned int p)

+{

+	_delay_ms(1);

+	if (com == 1)

+		PORTB &= ~_BV(PB0);

+	else

+		PORTB |= _BV(PB0);

+	unsigned int PH,PL;

+	PH = p / 16;

+	PL = p % 16;

+	PORTB |= _BV(PB2);

+	PORTD = PH;

+	_delay_ms(1);

+	PORTB &= ~_BV(PB2);

+	if (oct == 1)

+	{

+		_delay_ms(1);

+		PORTB |= _BV(PB2);

+		PORTD = PL;

+		_delay_ms(1);

+		PORTB &= ~_BV(PB2);

+	}

+	_delay_ms(1);

+}

+void lcd_init(void)

+{

+	com = 1;

+	oct = 0;

+	lcd(0x30); _delay_ms(5);

+	lcd(0x30); _delay_ms(5);

+	lcd(0x30); _delay_ms(5);

+	lcd(0x28); _delay_ms(5);

+	oct = 1;

+	lcd(0x28); _delay_ms(5);

+	lcd(0x08); _delay_ms(5);

+	lcd(0x01); _delay_ms(5);

+	lcd(0x06); _delay_ms(5);

+	lcd(0x0C); _delay_ms(5);

+}

+void lcd_clear(void)

+{

+	com = 1;

+	lcd(0x01); _delay_ms(2);

+	lcd(0x06);

+}

+void lcd_text(char *str)

+{

+	com = 0;

+	unsigned int len = strlen(str);

+	for (int i=0; i<12; i++)

+	lcd(str[i]);

+}

+void lcd_num(unsigned long int a)

+{

+	unsigned long int b = 0, c = a;

+	while (a > 0)

+	{

+		b = b*10 + (a%10);

+		a /= 10;

+	}

+	com = 0;

+	while (b > 0)

+	{

+		lcd( b%10+48 );

+		b = b / 10;

+	}

+	while (c%10 == 0)

+	{

+		c /= 10;

+		lcd('0');

+	}

+}

+void main(void)

+{

+   DDRB   = 0x05;

+	DDRD   = 0x0F;

+	PORTB  = 0xFF;

+	PORTD  = 0xFF;

+	SREG  |= 0x80;

+	TIMSK |= 0x08;

+	TCCR1B = 0xC1;

+	lcd_init();

+	lcd_text("I am ready!");

+	while (bit_is_set(PINB,PB4));

+	while(1)

+	{

+		while (TM == 0);

+		unsigned int time = TM;

+		unsigned long K = 3e7;

+		AN = K / TM;

+		if (2*(K%time) >= time) AN++;

+		lcd_clear();

+		lcd_num(AN);

+		_delay_ms(500);

+		if (bit_is_clear(PINB,PB4))

+		{

+			com = 0;

+			lcd('+');

+			_delay_ms(5);

+			while (bit_is_clear(PINB,PB4));

+			_delay_ms(5);

+			while (bit_is_set(PINB,PB4));

+			lcd_clear();

+		}

+	}

+}

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