2.5 时间管理

概述

时间管理，提供了一族与时间相关的函数，可以获取/设置系统时钟滴答数（systick）、systick与毫秒单位之间互相转化、按毫秒、墙上时钟等单位进行任务睡眠的功能。

API讲解

编程实例

1、配置每秒钟的系统滴答数TOS_CFG_CPU_TICK_PER_SECOND：

#define TOS_CFG_CPU_TICK_PER_SECOND 1000u

2、编写main.c示例代码：

#include "tos.h"
#include "mcu_init.h"
 
#define STK_SIZE_TASK_DEMO      512
 
k_stack_t stack_task_demo[STK_SIZE_TASK_DEMO];
 
k_task_t task_demo;
 
extern void entry_task_demo(void *arg);
 
void entry_task_demo(void *arg)
{
    k_time_t ms;
    k_tick_t systick, after_systick;
 
    // 因为TOS_CFG_CPU_TICK_PER_SECOND为1000，也就是一秒钟会有1000个systick，因此1000个systick等于1000毫秒。
    systick = tos_millisec2tick(2000);
    printf("%d millisec equals to %lld ticks\n", 2000, systick);
 
    ms = tos_tick2millisec(1000);
    printf("%lld ticks equals to %d millisec\n", (k_tick_t)1000, ms);
 
    systick = tos_systick_get();
    printf("before sleep, systick is %lld\n", systick);
 
    tos_msleep(2000);
 
    after_systick = tos_systick_get();
    printf("after sleep %d ms, systick is %lld\n", 2000, after_systick);
 
    printf("milliseconds sleep is about: %d\n", tos_ticks2millisec(after_systick - systick));
}
 
int main(void)
{
    board_init();
    tos_knl_init();
    (void)tos_task_create(&task_demo, "receiver_higher_prio", entry_task_demo, NULL,
                            4, stack_task_demo, STK_SIZE_TASK_DEMO, 0);
    tos_knl_start();
}

运行效果

2000 millisec equals to 2000 ticks1000 ticks equals to 1000 millisecbefore sleep, systick is 7after sleep 2000 ms, systick is 2009milliseconds sleep is about: 2002

实例代码