Click on file name in tab to download the code /* * flashLED.c * * Created on: 21-Feb-2011 * Author: user * */ #include #include // This program will turn the LEDs on for 100ms, // then off for 200ms, endlessly. int main(void) { // Set Port B pins for 3 and 4 as outputs // PORTB bit 3 = physical pin #2 on the ATTINY45 // PORTB bit 4 = physical pin #3 on the ATTINY45 DDRB = 0x18; // In binary this is 0001 1000 (note that is bit 3 and 4) // AVR-GCC also would accept 0b00011000, by the way. // Set up a forever loop using your favorite C-style 'for' loop for ( ; 1==1 ; ) // loop while 1 equals 1 { // Set Port B pins for 3 and 4 as HIGH (i.e. turn the LEDs on) PORTB = 0x18; // If we wanted only PB4 on, it'd be PORTB=0x10 // Use a function (defined in delay.h) to pause 100 milliseconds _delay_ms(100); // Set PORTB to be all LOWs (i.e. turn the LEDs off) PORTB = 0x00; // Delay for a 200ms _delay_ms(200); } return 1; }