125 lines
2.3 KiB
C
125 lines
2.3 KiB
C
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#include "sys/clock.h"
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#include "dev/clock-avr.h"
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#include "sys/etimer.h"
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#include <avr/io.h>
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#include <avr/interrupt.h>
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static volatile clock_time_t count, scount;
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static volatile unsigned long seconds;
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/*---------------------------------------------------------------------------*/
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//SIGNAL(SIG_OUTPUT_COMPARE0)
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ISR(AVR_OUTPUT_COMPARE_INT)
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{
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count++;
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if(++scount == CLOCK_SECOND) {
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scount = 0;
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seconds++;
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}
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if(etimer_pending()) {
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etimer_request_poll();
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}
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}
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/* External clock source does not work ? */
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#if 0
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void
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clock_init(void)
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{
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cli ();
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TIMSK &= ((unsigned char)~(1 << (TOIE0)));
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TIMSK &= ((unsigned char)~(1 << (OCIE0)));
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/* Disable TC0 interrupt */
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/**
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* set Timer/Counter0 to be asynchronous
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* from the CPU clock with a second external
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* clock(32,768kHz)driving it
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*/
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ASSR |= (1 << (AS0));
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TCCR0 = _BV (CS02) | _BV (CS01) | _BV (WGM1);
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TCNT0 = 0;
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OCR0 = 128;
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TIMSK |= (1 << (OCIE0));
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TIMSK |= (1 << (TOIE0));
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sei ();
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}
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#endif
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/*---------------------------------------------------------------------------*/
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void
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clock_init(void)
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{
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cli ();
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OCRSetup();
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/*
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* Counts the number of ticks. Since clock_time_t is an unsigned
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* 16 bit data type, time intervals of up to 524 seconds can be
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* measured.
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*/
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scount = count = 0;
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sei ();
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}
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/*---------------------------------------------------------------------------*/
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clock_time_t
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clock_time(void)
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{
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clock_time_t tmp;
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do {
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tmp = count;
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} while(tmp != count);
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return tmp;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Delay the CPU for a multiple of TODO
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*/
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void
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clock_delay(unsigned int i)
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{
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for (; i > 0; i--) { /* Needs fixing XXX */
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unsigned j;
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for (j = 50; j > 0; j--)
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asm volatile("nop");
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Wait for a multiple of 1 / 125 sec = 0.008 ms.
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*
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*/
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void
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clock_wait(int i)
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{
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clock_time_t start;
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start = clock_time();
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while(clock_time() - start < (clock_time_t)i);
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_set_seconds(unsigned long sec)
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{
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// TODO
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}
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unsigned long
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clock_seconds(void)
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{
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unsigned long tmp;
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do {
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tmp = seconds;
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} while(tmp != seconds);
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return tmp;
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}
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