76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/*
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* sys_tick.c
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*
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* Created on: Sep 25, 2015
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* Author: tkl
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*/
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#include <stddef.h>
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#include <stdbool.h>
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#include "timer.h"
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#include "sys_tick.h"
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#include "irq.h"
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#include "stack.h"
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#include "queue.h"
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#include "thread.h"
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#include "schedule.h"
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#include "kernel.h"
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struct sys_tick_obj
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{
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struct loki_timer *hw_timer;
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unsigned long tick;
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unsigned int used;
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};
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extern volatile struct thread_context *current_thread;
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extern volatile struct thread_list threads;
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static struct sys_tick_obj sys_tick_obj;
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void *timer_cb(void *arg)
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{
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int i;
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sys_tick_obj.tick++;
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for(i = 0; i < threads.count; i++) {
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if(threads.list[i]->status == THREAD_STATUS_SLEEPING) {
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if(threads.list[i]->next_executing_time <= sys_tick_obj.tick) {
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threads.list[i]->status = THREAD_STATUS_EXECUTING;
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sys_tick_obj.used--;
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if(sys_tick_obj.used == 0)
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timer_close(sys_tick_obj.hw_timer);
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}
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}
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}
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return arg;
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}
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void sys_tick_init(const struct loki_timer *hw_timer)
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{
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if(NULL == hw_timer)
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return;
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sys_tick_obj.tick = 0;
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sys_tick_obj.used = 0;
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sys_tick_obj.hw_timer = (struct loki_timer *)hw_timer;
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timer_set_it_callback(hw_timer, timer_cb, NULL);
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}
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unsigned long sys_tick_get_ms(void)
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{
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return sys_tick_obj.tick;
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}
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void sleep_ms(unsigned int ms)
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{
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int irq;
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irq = disable_irq();
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current_thread->next_executing_time = sys_tick_obj.tick + ms;
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current_thread->status = THREAD_STATUS_SLEEPING;
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sys_tick_obj.used++;
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if(sys_tick_obj.used == 1)
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timer_open(sys_tick_obj.hw_timer);
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restore_irq(irq);
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schedule();
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}
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