diff -r f01fb659e54d -r e4ac5a591dcd hello.c
--- a/hello.c	Thu Apr 03 18:49:18 2014 +0300
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,116 +0,0 @@
-#include <avr/io.h>
-#include "stdlib.h"
-
-#include <avr/interrupt.h>
-
-#define TIMER_FLAGS     GPIOR0
-#define TIMER1_BUSY     1
-
-/*
- * Setup timers.
- */
-void timer_init (void)
-{
-    TCCR1A = (
-            // OC1A output pin disconnected
-            0b00 << COM1A0
-            // OC1B output pin disconnected
-        |   0b00 << COM1B0
-            // no PWM
-        |   0b00 << WGM10
-    );
-    TCCR1B = (
-            // CTC mode
-            0b01 << WGM12 
-    );
-    TCCR1C = 0;
-}
-
-void timer1_start (short cycles)
-{
-    // count up from zero...
-    TCNT1 = 0;
-
-    // ...to the given number of timer cycles
-    OCR1A = cycles;
-
-    // start!
-    sbi(&TIMER_FLAGS, TIMER1_BUSY);
-    TIMSK1 = (
-            // OCA interrupt
-            0b1 << OCIE1A       // enable
-    );
-    TCCR1B = (
-            // WGM
-            0b01  << WGM12      // CTC
-
-            // clocksource
-        |   0b101 << CS10       // 1024'th
-    );
-}
-
-static void timer1_stop ()
-{
-    // WGM: normal
-    // clocksource: stop
-    TCCR1B = 0;
-
-    cbi(&TIMER_FLAGS, TIMER1_BUSY);
-}
-
-ISR(TIMER1_COMPA_vect)
-{
-    timer1_stop();
-
-    // XXX: cpu will automatically wake up from sleep()
-}
-
-/*
- * Sleep on timer1 interrupt.
- */
-void timer_sleep (int cycles)
-{
-    // set timer
-    timer1_start(cycles);
-
-    // sleep
-    // TODO: PRR
-    SMCR = (
-            // idle sleep
-            (0b00 << SM0)
-
-            // enable sleep
-        |   (0b1 << SE)
-    );
-    
-    // sleep
-    while (tbi(&TIMER_FLAGS, TIMER1_BUSY)) {
-        __asm__ ( "sleep" :: );
-    }
-
-    // cleanup
-    SMCR = 0;
-}
-
-int main (void)
-{
-    timer_init();
-
-    // LED
-    sbi(&DDRB, DDB5);
-
-    sei();
-
-    // blink
-    short timeout = 1000;
-    short delta = 10;
-
-    while (true) {
-        // bitflip
-        xbi(&PORTB, PORTB5);
-        
-        timer_sleep(timeout);
-        
-        timeout += delta;
-    }
-}