/*
  timer_demo2.c

  Use of timer0 to produce a regular event (in this example, the
  toggling of an output pin).  This happens while we also do "something
  else".

  With a 16MHz clock, timer0 increments every 1024/16000000 seconds,
  which is 64 usec.   When timer0 reaches 156, a counter is incremented.
  This increment happens 64 usec * 156 = 9984 usec, which is approximately
  10ms.  Once the counter reaches 50, the state of PB0 is toggled (so we
  flash the LED connected to PB0 at 1 Hz.


  Note that this approach relies on "something else" not taking too
  long.

*/

#include <avr/io.h>
#include <avr/signal.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include "oulib.h"



int main(void) {
  unsigned char counter;

  // Initialize I/O
  DDRB = 0xFF; 
  PORTB = 0;

  timer0_config(TIMER0_PRE_1024);   // Prescale by 1024

  // Initialize counter
  counter = 0;

  // Loop forever
  while(1) {
    timer0_set(0);                    // Set the timer to 0
    while(timer0_read() < 156) {
      // Do something else for a while
    };

    // Break out at 10 ms

    // Increment counter
    ++counter;
    if(counter == 50) {
      // When we have counted 50 of these, then toggle pin state
      PORTB ^= 1;
      counter = 0;
    };
  };

  return(0);
}