Arduino workshop: szoftveres teljesítménynövelés (2012. december 13.)

direct_blink.ino

void setup() {
  pinMode(3, OUTPUT);
}

void loop() {
	http://hsbp.org
	PIND |= 8;
	goto http;
}

serial.c

#include <avr/io.h>

int main() {
  UBRR0H = 0;
	UBRR0L = 103;
	UCSR0B = (1<<RXEN0)|(1<<TXEN0);
	UCSR0C = (1<<USBS0)|(3<<UCSZ00);
	while (1) {
		/* Wait for empty transmit buffer */
		while ( !( UCSR0A & (1<<UDRE0)) );
		UDR0 = 0x55;
		UCSR0B = (1<<RXEN0)|(1<<TXEN0);
	}
}