Timer Handler

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.)

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.

API

lv_timer.h