구차니의 잡동사니 모음

#include "avr/io.h"
#include "avr/interrupt.h"

volatile unsigned int sv1_high, sv1_low, sv1_flag, sv1_range, sec;
volatile unsigned char Bout;
volatile unsigned char inputval;
volatile unsigned char lastinput;

ISR(USART0_RX_vect)
{
	if(UDR0 == 0x0A || UDR0 == 0x0D)
	{
		if(lastinput != UDR0)
		{
			sv1_range = inputval;
			inputval = 0;
			PORTF = 0x01;
		}
	}
	else
	{
		inputval = inputval * 10 + UDR0 - '0';
		PORTF = PORTF << 1;
	}

	lastinput= UDR0;
}

ISR(TIMER0_OVF_vect)
{
	if(sv1_flag == 0)
	{
		if(sv1_low == 1250)
		{
			if(sec > 49)	sec = 0;
			else			sec++;

			sv1_flag = 1;
			sv1_low = 0;
			Bout = 0xFF;
		}
		else
		{
			sv1_low++;
		}
	}
	else
	{
		sv1_high++;
		if(sv1_high > sv1_range)
		{
			sv1_flag = 0;
			sv1_high = 0;
			Bout = 0x00;
		}

		TCNT0 = 0;
	}
}

void init_uart0()
{
	UBRR0H = 0;
    UBRR0L = 8; // 115k with U2X = 0
    UCSR0A = 0x00; // U2X = 0;
    UCSR0B = 0xD8;
    UCSR0C = 0x06; //Asyncronous - no parity - 1bits(stop) - 8bits(data)
}

int main(void)
{
	SREG = 0x80;

	DDRF = 0xFF;
	DDRC = 0xFF;
	TIMSK = 1 << TOIE0;
	TCNT0 = 0x00;
	TCCR0 = 0x01;

	PORTF = 0x01;
//	sv1_range = 32; // 0 degree
	sv1_range = 76; // 90 degree
//	sv1_range = 112; // 180 degree
	
	init_uart0();

	sei();

	for(;;)
	{
		// 1msec = 62.5
		sec = 0;
		while(sec < 49)
		{
			PORTC = Bout;
		}
	}
}