定时器的高级用法

全局变量一共用4次声明+创建+开始+结束

time_ops_type timer =
{
.creat = timer_register_isr,
.stop = timer_stop_time ,
.start = timer_start_time,
};

然后先看简单的

uint8_t timer_stop_time(uint8_t handle)
{
   time_type *priv = time;

   while( priv != NULL )
{
if( priv->handle == handle)
{
priv->start = false;
           priv->cnt = 0;
return true;
}
priv = priv->next;
   }

return false;
}

uint8_t timer_start_time(uint8_t handle)
{
   time_type *priv = time;

   while( priv != NULL )
{
if( priv->handle == handle)
{
priv->start = true;
return true;
}
priv = priv->next;
   }

return false;
}

基本是一样的开始和结束就是在链表里面去找这个handle 找到以后就设置它true/false

看创建

uint8_t timer_register_isr( uint32_t time_out ,uint8_t start, time_call_back call_back)
{
time_type *priv;
time_type *this;

   this = (time_type *)timer_malloc(sizeof(time_type));
   if( this != NULL)
   {

       this->cnt = 0;
       this->start = start;
       this->handle = timerTaskId++;
       this->time_out = time_out;
       this->fun = call_back;
       this->next = NULL;
if( time == NULL)
       {
          time = this;
       }
       else
       {
           priv = time;
           while( priv->next != NULL )   priv = priv->next;
           priv->next = this;
       }
   }
   else
   {
       return 0xFF;
   }

return (this->handle);

}
这是一个链表并且每次都是尾巴插入做成一个链表呀

全局变量 //osal time queue
time_type *time = NULL;

是头后面都是尾巴插入

最后怎么用呢？

链表做好了时驱函数一样的需要一个后台的程序在定时器不停的扫描

start为1就是开启的为0就是关闭的

handle就是编号

cnt tinmeout 是变量和常量的比较

next指针

还有一个回调函数

定时器的高级用法

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