App:Library:LVGL:docs:Porting:Tick interface

https://docs.lvgl.io/8.2/porting/tick.html

英文	自動翻訳

Tick interface

英文

自動翻訳

LVGL needs a system tick to know elapsed time for animations and other tasks. You need to call the lv_tick_inc(tick_period) function periodically and provide the call period in milliseconds. For example, lv_tick_inc(1) when calling every millisecond. lv_tick_inc should be called in a higher priority routine than lv_task_handler() (e.g. in an interrupt) to precisely know the elapsed milliseconds even if the execution of lv_task_handler takes more time. With FreeRTOS lv_tick_inc can be called in vApplicationTickHook. On Linux based operating systems (e.g. on Raspberry Pi) lv_tick_inc can be called in a thread like below: void * tick_thread (void *args) { while(1) { usleep(5*1000); /*Sleep for 5 millisecond*/ lv_tick_inc(5); /*Tell LVGL that 5 milliseconds were elapsed*/ } }

戻る : Previous

API

英文

自動翻訳

Provide access to the system tick with 1 millisecond resolution Functions uint32_t lv_tick_get(void) Get the elapsed milliseconds since start up Returns the elapsed milliseconds uint32_t lv_tick_elaps(uint32_t prev_tick) Get the elapsed milliseconds since a previous time stamp Parameters prev_tick -- a previous time stamp (return value of lv_tick_get() ) Returns the elapsed milliseconds since 'prev_tick'

戻る : Previous