Projects/Incomplete/Webserver/Lib/uip/conf/clock-arch.c

   1 #include "global-conf.h"
   2 #include <stdint.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <avr/interrupt.h>
   6 #include <avr/io.h>
   7 #include <avr/sfr_defs.h>
   8
   9 #include "clock-arch.h"
  10
  11 //Counted time
  12 volatile clock_time_t clock_datetime = 0;
  13
  14 //Overflow interrupt
  15 ISR(TIMER0_OVF_vect)
  16 {
  17         clock_datetime += 1;
  18 }
  19
  20 //Initialise the clock
  21 void clock_init()
  22 {
  23         //Activate overflow interrupt for timer0
  24         TIMSK0 |= (1<<TOIE0);
  25
  26         //Use prescaler 1024
  27         TCCR0B |= ((1<<CS12)|(1<<CS10));
  28
  29         //Activate interrupts
  30         sei();
  31 }
  32
  33 //Return time
  34 clock_time_t clock_time()
  35 {
  36         clock_time_t time;
  37
  38         cli();
  39                 time = clock_datetime;
  40         sei();
  41
  42         return time;
  43 }