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source/rt_thread/src/clock.c

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+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-12     Bernard      first version
+ * 2006-05-27     Bernard      add support for same priority thread schedule
+ * 2006-08-10     Bernard      remove the last rt_schedule in rt_tick_increase
+ * 2010-03-08     Bernard      remove rt_passed_second
+ * 2010-05-20     Bernard      fix the tick exceeds the maximum limits
+ * 2010-07-13     Bernard      fix rt_tick_from_millisecond issue found by kuronca
+ * 2011-06-26     Bernard      add rt_tick_set function.
+ * 2018-11-22     Jesven       add per cpu tick
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+static rt_tick_t rt_tick = 0;
+
+/**
+ * This function will initialize system tick and set it to zero.
+ * @ingroup SystemInit
+ *
+ * @deprecated since 1.1.0, this function does not need to be invoked
+ * in the system initialization.
+ */
+void rt_system_tick_init(void)
+{
+}
+
+/**
+ * @addtogroup Clock
+ */
+
+/**@{*/
+
+/**
+ * This function will return current tick from operating system startup
+ *
+ * @return current tick
+ */
+rt_tick_t rt_tick_get(void)
+{
+    /* return the global tick */
+    return rt_tick;
+}
+
+/**
+ * This function will set current tick
+ */
+void rt_tick_set(rt_tick_t tick)
+{
+    rt_base_t level;
+
+    level = rt_hw_interrupt_disable();
+    rt_tick = tick;
+    rt_hw_interrupt_enable(level);
+}
+
+/**
+ * This function will notify kernel there is one tick passed. Normally,
+ * this function is invoked by clock ISR.
+ */
+void rt_tick_increase(void)
+{
+    struct rt_thread *thread;
+
+    /* increase the global tick */
+    ++ rt_tick;
+
+    /* check time slice */
+    thread = rt_thread_self();
+
+    -- thread->remaining_tick;
+    if (thread->remaining_tick == 0)
+    {
+        /* change to initialized tick */
+        thread->remaining_tick = thread->init_tick;
+
+        /* yield */
+        rt_thread_yield();
+    }
+
+    /* check timer */
+    rt_timer_check();
+}
+
+/**
+ * This function will calculate the tick from millisecond.
+ *
+ * @param ms the specified millisecond
+ *           - Negative Number wait forever
+ *           - Zero not wait
+ *           - Max 0x7fffffff
+ *
+ * @return the calculated tick
+ */
+rt_tick_t rt_tick_from_millisecond(rt_int32_t ms)
+{
+    rt_tick_t tick;
+
+    if (ms < 0)
+    {
+        tick = (rt_tick_t)RT_WAITING_FOREVER;
+    }
+    else
+    {
+        tick = RT_TICK_PER_SECOND * (ms / 1000);
+        tick += (RT_TICK_PER_SECOND * (ms % 1000) + 999) / 1000;
+    }
+
+    /* return the calculated tick */
+    return tick;
+}
+
+/**@}*/
+