Projects/Webserver/Lib/uip/clock.c

   1 #include <stdint.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <avr/interrupt.h>
   5 #include <avr/io.h>
   6 #include <avr/sfr_defs.h>
   7
   8 #include "clock.h"
   9
  10 //Counted time
  11 volatile clock_time_t clock_datetime = 0;
  12
  13 //Overflow interrupt
  14 ISR(TIMER1_COMPA_vect)
  15 {
  16         clock_datetime += 1;
  17 }
  18
  19 //Initialise the clock
  20 void clock_init()
  21 {
  22         OCR1A  = (((F_CPU / 1024) / 100) - 1);
  23         TCCR1B = ((1 << WGM12) | (1 << CS12) | (1 << CS10));
  24         TIMSK1 = (1 << OCIE1A);
  25 }
  26
  27 //Return time
  28 clock_time_t clock_time()
  29 {
  30         clock_time_t time;
  31
  32         ATOMIC_BLOCK(ATOMIC_FORCEON)
  33         {
  34                 time = clock_datetime;
  35         }
  36
  37         return time;
  38 }
  39