Lv6 roller sometime return wrong value

aaront · November 2, 2019, 11:19am

Description

all 4 roller also have same behaviour sometime return wrong value.

What MCU/Processor/Board and compiler are you using?

ESP32 with arduino

What do you want to achieve?

4 roller to set temperature setting

What have you tried so far?

lv_roller_get_selected_str(roller, buf, buf_size);
lv_roller_get_selected(roller)`

Code to reproduce

The code block(s) should be formatted like:
roller0 = lv_roller_create(h, NULL);
lv_obj_set_pos(roller0, -320, 50); //set roller position --Aaron
lv_obj_set_width(roller0, 50); //set roller width --Aaron
lv_roller_set_options(roller0,
" 0 \n"
" 1 \n"
" 2 \n"
" 3 \n"
" 4 \n"
" 5 \n"
" 6 \n"
" 7 \n"
" 8 \n"
" 9 ",
LV_ROLLER_MODE_NORMAL);
lv_roller_set_visible_row_count(roller0, 3);
lv_obj_set_event_cb(roller0, B0roller_event);
lv_obj_align(roller0, NULL, LV_ALIGN_OUT_RIGHT_BOTTOM, -240, 0);

static void B0roller_event(lv_obj_t * obj, lv_event_t event)
{
if(event == LV_EVENT_VALUE_CHANGED) {

 char buf0[32];
 char buf1[32];
 char buf2[32];
 char buf3[32];
 
    lv_roller_get_selected_str(roller0, buf0, sizeof(buf0));
    lv_roller_get_selected_str(roller1, buf1, sizeof(buf1));
    lv_roller_get_selected_str(roller2, buf2, sizeof(buf2));
    lv_roller_get_selected_str(roller3, buf3, sizeof(buf3));

BTRolSave = BTRolSelected0 + BTRolSelected1 + BTRolSelected2 + BTRolSelected3 ;

   Serial.print("BTRolSave:");
     Serial.print(BTRolSave);
     Serial.println(":BTRolSave");

int rol0 = lv_roller_get_selected(roller0);
int rol1 = lv_roller_get_selected(roller1);
int rol2 = lv_roller_get_selected(roller2);
int rol3 = lv_roller_get_selected(roller3);

char buff0[10];
snprintf(buff0, 10, “%d%”, rol0);
lv_label_set_text(rol0label, buff0);

char buff1[10];
snprintf(buff1, 10, “%d%”, rol1);
lv_label_set_text(rol1label, buff1);

char buff2[10];

snprintf(buff2, 10, “%d%”, rol2);
lv_label_set_text(rol2label, buff2);

char buff3[10];
snprintf(buff3, 10, “%d%”, rol3);
lv_label_set_text(rol3label, buff3);

Serial.print(“rol0 :” );
Serial.println(rol0);
Serial.print(“rol1 :” );
Serial.println(rol1);
Serial.print(“rol2 :” );
Serial.println(rol2);
Serial.print(“rol3 :” );
Serial.println(rol3);

}

Screenshot and/or video

lv6 roller.zip (1.8 MB)

embeddedt · November 3, 2019, 5:58pm

Please format your code blocks correctly. You appear to have ignored the guidelines provided in the template.

Have you updated to the latest master branch? I think this issue was reported before and fixed.

Another suggestion is to try a larger font - maybe the roller items are too small for you to accurately press them and/or your touchscreen is not calibrated correctly.

aaront · November 4, 2019, 2:20pm

hi embeddedt thank you for helping me.
any idea where i can find the code blocks format?

i use arduino IDE install LittlevGL Version 2.0.1 via Library Manager .
i will try larger font.

before i have read few site and say capacitive touchscreen no need to calibrated, but i also feel my capacitive touchscreen someting is like a bit not respone very smooth. do you have any idea how to calibrate capacitive touchscreen ?

embeddedt · November 4, 2019, 8:00pm

It’s provided in the template.

You should format the code blocks like this:
```c
/*You code here*/
```

aaront · November 5, 2019, 5:17pm

code to create 4 roller and 4 label.

static void create_tab1(lv_obj_t * parent)
{
    lv_page_set_scrl_layout(parent, LV_LAYOUT_PRETTY);

    lv_theme_t * th = lv_theme_get_current();

    static lv_style_t h_style;
    lv_style_copy(&h_style, &lv_style_transp);
    h_style.body.padding.inner = LV_DPI / 10;
    h_style.body.padding.left = LV_DPI / 4;
    h_style.body.padding.right = LV_DPI / 4;
    h_style.body.padding.top = LV_DPI / 10;
    h_style.body.padding.bottom = LV_DPI / 10;

    lv_obj_t * h = lv_cont_create(parent, NULL);
    lv_obj_set_style(h, &h_style);
    lv_obj_set_click(h, false);
    lv_cont_set_fit(h, LV_FIT_TIGHT);
  /*  lv_cont_set_layout(h, LV_LAYOUT_COL_M); */


   rol0label = lv_label_create(h, NULL);
   lv_label_set_text(rol0label, "N1");
   lv_obj_set_style(rol0label, th->style.label.prim);
   lv_obj_align(rol0label, NULL, LV_ALIGN_IN_TOP_LEFT, -30, 0); 

   rol1label = lv_label_create(h, NULL);
   lv_label_set_text(rol1label, "N2");
   lv_obj_set_style(rol1label, th->style.label.sec);
   lv_obj_align(rol1label, rol0label, LV_ALIGN_OUT_RIGHT_TOP, 30, 0); 

   rol2label = lv_label_create(h, NULL);
   lv_label_set_text(rol2label, "N2");
   lv_obj_set_style(rol2label, th->style.label.hint);
   lv_obj_align(rol2label, rol1label, LV_ALIGN_OUT_RIGHT_MID,   30, 0);

   rol3label = lv_label_create(h, NULL);
   lv_label_set_text(rol3label, "N2");
   lv_obj_set_style(rol3label, th->style.label.hint);
   lv_obj_align(rol3label, rol2label, LV_ALIGN_OUT_RIGHT_MID,   30, 0);


     roller0 = lv_roller_create(h, NULL);  
     lv_obj_set_pos(roller0, -320, 50); 
     lv_obj_set_width(roller0, 50); 
     lv_roller_set_options(roller0,
                           " 0 \n"
                           " 1 \n"
                           " 2 \n"
                           " 3 \n"
                           " 4 \n"
                           " 5 \n"
                           " 6 \n"
                           " 7 \n"
                           " 8 \n"
                           " 9 ",
                           LV_ROLLER_MODE_NORMAL);
    lv_roller_set_visible_row_count(roller0, 3);
    lv_obj_set_event_cb(roller0, B0roller_event);
    lv_obj_align(roller0, NULL, LV_ALIGN_OUT_RIGHT_BOTTOM, -240, 0);  
 
 
    roller1 = lv_roller_create(h, NULL);
    lv_roller_set_options(roller1,
                           " 0 \n"
                           " 1 \n"
                           " 2 \n"
                           " 3 \n"
                           " 4 \n"
                           " 5 \n"
                           " 6 \n"
                           " 7 \n"
                           " 8 \n"
                           " 9 ",
                           LV_ROLLER_MODE_NORMAL);
    lv_roller_set_visible_row_count(roller1, 3);
    lv_obj_align(roller1, roller0, LV_ALIGN_OUT_RIGHT_TOP, 15, 0);        
    lv_obj_set_event_cb(roller1, B0roller_event);


lv_obj_t * btnDot = lv_btn_create(h, NULL); 
lv_obj_set_size(btnDot, 5, 5);
lv_obj_align(btnDot, roller1, LV_ALIGN_OUT_RIGHT_BOTTOM, 10, 0);    

    roller2 = lv_roller_create(h, NULL);
    lv_roller_set_options(roller2,
                           " 0 \n"
                           " 1 \n"
                           " 2 \n"
                           " 3 \n"
                           " 4 \n"
                           " 5 \n"
                           " 6 \n"
                           " 7 \n"
                           " 8 \n"
                           " 9 ",
                           LV_ROLLER_MODE_NORMAL);
    lv_roller_set_visible_row_count(roller2, 3);
    lv_obj_align(roller2, btnDot, LV_ALIGN_OUT_RIGHT_MID,   10, -40);  
    lv_obj_set_event_cb(roller2, B0roller_event);
 
    roller3 = lv_roller_create(h, NULL);
    lv_roller_set_options(roller3,
                           " 0 \n"
                           " 1 \n"
                           " 2 \n"
                           " 3 \n"
                           " 4 \n"
                           " 5 \n"
                           " 6 \n"
                           " 7 \n"
                           " 8 \n"
                           " 9 ",
                           LV_ROLLER_MODE_NORMAL);
    lv_roller_set_visible_row_count(roller3, 3);
    lv_obj_align(roller3, roller2, LV_ALIGN_OUT_RIGHT_TOP, 15, 0);      
    lv_obj_set_event_cb(roller3, B0roller_event);

 
}

below is roller event update the label

static void B0roller_event(lv_obj_t * obj, lv_event_t event)
{
    if(event == LV_EVENT_VALUE_CHANGED) {
      
     char buf0[32];
     char buf1[32];
     char buf2[32];
     char buf3[32];
     
        lv_roller_get_selected_str(roller0, buf0, sizeof(buf0));
        lv_roller_get_selected_str(roller1, buf1, sizeof(buf1));
        lv_roller_get_selected_str(roller2, buf2, sizeof(buf2));
        lv_roller_get_selected_str(roller3, buf3, sizeof(buf3));


 BTRolSave = BTRolSelected0 + BTRolSelected1 + BTRolSelected2 + BTRolSelected3 ; 

         Serial.print("BTRolSave:");
         Serial.print(BTRolSave);
         Serial.println(":BTRolSave"); 
         

 int rol0 = lv_roller_get_selected(roller0);
 int rol1 = lv_roller_get_selected(roller1);
 int rol2 = lv_roller_get_selected(roller2);
 int rol3 = lv_roller_get_selected(roller3);
 
 
  char buff0[10];
  snprintf(buff0, 10, "%d%", rol0);
  lv_label_set_text(rol0label, buff0);

  char buff1[10];
  snprintf(buff1, 10, "%d%", rol1);
  lv_label_set_text(rol1label, buff1);

   char buff2[10];
  snprintf(buff2, 10, "%d%", rol2);
  lv_label_set_text(rol2label, buff2);

  char buff3[10];
  snprintf(buff3, 10, "%d%", rol3);
  lv_label_set_text(rol3label, buff3);
  
     
    Serial.print("rol0 :" );
    Serial.println(rol0);
    Serial.print("rol1 :" );
    Serial.println(rol1);
    Serial.print("rol2 :" );
    Serial.println(rol2);
    Serial.print("rol3 :" );
    Serial.println(rol3);
             
    }
}

after few days testing. i found sometime when slide the roller, the roller not moving but the value change and label get update with new value.

kisvegabor · November 15, 2019, 11:12am

I’ve tried this code but it worked well for me in the simulator.

aaront · November 18, 2019, 3:49pm

hi kisvegabor,

thank you for your geat work with geat support. i will buy another ESP32 to test out. i will report back here the result.