Timer Handler（定时器处理程序）

显示原文

To drive the timers of LVGL you need to call lv_timer_handler() periodically in one of the following:

while(1) of main() function, or
an OS task periodically. (See LVGL and Threads（LVGL 与线程）.)

Example:

while(1) {
  uint32_t time_till_next = lv_timer_handler();
  my_delay_ms(time_till_next);
}

If you want to use lv_timer_handler() in a super-loop, a helper function lv_timer_handler_run_in_period() is provided to simplify supplying LVGL with time awareness:

while(1) {
   ...
   lv_timer_handler_run_in_period(5); /* run lv_timer_handler() every 5ms */
   ...
}

Or use the sleep time automatically calculated by LVGL:

while(1) {
  ...
  lv_timer_periodic_handler();
  ...
}

In an OS environment, you can use it together with the delay or sleep provided by OS to release CPU whenever possible:

while (1) {
   uint32_t time_till_next = lv_timer_handler();
   os_delay_ms(time_till_next); /* delay to avoid unnecessary polling */
}

See Timers（定时器） section to learn more about timers. .. raw:: html

</details> <br>

要驱动 LVGL 的定时器，需要在以下情况之一中定期调用 lv_timer_handler() 函数： - 在 main() 函数的 while(1) 循环中，或者 - 在操作系统任务中定期调用。（请参阅 LVGL and Threads（LVGL 与线程）。）

示例：

while(1) {
  uint32_t time_till_next = lv_timer_handler();
  my_delay_ms(time_till_next);
}

如果想在主循环中使用 lv_timer_handler() ，提供了一个辅助函数 lv_timer_handler_run_in_period() 来简化为 LVGL 提供时间感知的操作：

while(1) {
   ...
   lv_timer_handler_run_in_period(5); /* run lv_timer_handler() every 5ms */
   ...
}

或者使用由 LVGL 自动计算出的休眠时间：

while(1) {
  ...
  lv_timer_periodic_handler();
  ...
}

在操作系统环境中，可以将它与操作系统提供的延迟或休眠功能一起使用，以便在可能的情况下释放 CPU 资源：

while (1) {
   uint32_t time_till_next = lv_timer_handler();
   os_delay_ms(time_till_next); /* delay to avoid unnecessary polling */
}

要了解更多关于定时器的内容，请参阅 Timers（定时器）部分。 API *** .. Autogenerated

lv_timer.h