Animation wont start

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1

Hi all
I need to use the lvgl lib version 8.4.0 and I wnat create a anmitation that update every second a text field. I was able create the textfiel and wirte in it.

I have the created to functions, one for setting up the animation, and one for calling every 1 sewcond

void lv_label_set_time(void* text_label_value, int32_t v) {
    Serial.println("lv_label_set_time");
    char time_str_[9];
    time_t now_ = time(nullptr);
    struct tm* timeinfo_ = localtime(&now_);
    sprintf(time_str_, "%02d:%02d:%02d", timeinfo_->tm_hour, timeinfo_->tm_min, timeinfo_->tm_sec);
    
    lv_label_set_text((lv_obj_t*)text_label_value, time_str_);

    Serial.println(time_str_);
}

void lv_create_anim_update_time(void) {
    // Create an animation to update the time every second
    lv_anim_t a_;
    lv_anim_init(&a_);

    lv_anim_set_var(&a_, text_label_time_value);
    lv_anim_set_values(&a_, 0, 59);
    lv_anim_set_time(&a_, 1000); 
    lv_anim_set_repeat_count(&a_, LV_ANIM_REPEAT_INFINITE); 

    lv_anim_set_exec_cb(&a_, (lv_anim_exec_xcb_t)lv_label_set_time);

    lv_anim_start(&a_);
    Serial.println("Animation started");
}

void loop(){
    lv_task_handler();  // let the GUI do its work
    lv_tick_inc(5);     // tell LVGL how much time has passed
    delay(5);           // let this time pass
}

lv_label_set_time is called once at the creation time, but then it is not anymore called. Any idea why it is not working?

2

Animations isnt designed for this purpose, but can be used.
For change text is more flexible use lv timer.

3

Thanks @Marian_M

I have created a call back method for the timer

void lv_label_set_datetime(lv_timer_t* timer) {
	Serial.println("lv_label_set_datetime");
}

I intizalize the timer in setup this way

type or paste code here

I create the UI

    Serial.println("Create UI");
    /* Lock the mutex due to the LVGL APIs are not thread-safe */
    lvgl_port_lock(-1);

    lv_create_main_ui();

    lv_timer_t* timer_time_ = lv_timer_create(lv_label_set_datetime, 1000, NULL);
    lv_timer_ready(timer_time_);

    /* Release the mutex */
    lvgl_port_unlock();

As soon I add this line to the loop

    lv_timer_handler();

The program is not running anymore. To I forgot something?

4

It seams that I have not to add

lv_timer_handler

The timer will be executed without this line

5

You read docu or completely not?
Timer cb func is normal with parameter as describe docu

void (*lv_timer_cb_t)(lv_timer_t *) prototype

and this isnt required

lv_timer_ready(timer_time_);

and all this work only if lvgl tick is ok handled.