LVGL V9.2.0, Adafruit ANO Rotary Encoder (I2C), Example_Menu_3

General discussion
1

Hi All,

I am trying to understand why the LVGL Menu demo is not showing any indication of selection using an encoder with 5 buttons. I have tried creating a group, followed many of the examples in the forum, mostly they don’t compile due them referencing old LVGL versions. I am not sure what I am missing or overlooking. I want to first get the UP/DOWN/LEFT/RIGHT/SELECT buttons working before I get the Encoder part working, Currently I just want my display to indicate Item 1/Item 2/Item 3 in example 3 “selected” when I press UP/DOWN.

All I can see are these 3 labels displayed, no other activity.
Item 1 (Click me!)
Item 2 (Click me!)
Item 3 (Click me!)

Global declaration

static lv_obj_t * menu;      //created in example_menu_3
static lv_group_t * menu_group;
static lv_indev_t * indev;

I have included lv_example_menu_3 (identical to the lvgl example) including what is listed below in my setup()

  menu_group = lv_group_create();

  indev = lv_indev_create();
  lv_indev_set_type(indev, LV_INDEV_TYPE_KEYPAD);
  lv_indev_set_read_cb(indev, ANO_Rotary_read);

  lv_indev_set_group(indev, menu_group);

  lv_example_menu_3();
  lv_group_add_obj(menu_group, menu);
  lv_group_set_default(menu_group);

The Callback works as I can see the Serial.println(…) in my Serial monitor, so when I press a button I set the UART message. The data->key and data->state is not being actioned.

void ANO_Rotary_read(lv_indev_t * indev, lv_indev_data_t*data) {

  if (! ss.digitalRead(SS_SWITCH_UP)) {
    data->key = LV_KEY_PREV;
    data->state = LV_INDEV_STATE_PRESSED;
  Serial.println("UP pressed!");
  } else { 
    data->key = LV_KEY_PREV;
    data->state = LV_INDEV_STATE_RELEASED;
  }

  if (! ss.digitalRead(SS_SWITCH_DOWN)) {
    data->key = LV_KEY_NEXT;
    data->state = LV_INDEV_STATE_PRESSED;
  Serial.println("DOWN pressed!");
  } else { 
    data->key = LV_KEY_NEXT;
    data->state = LV_INDEV_STATE_RELEASED;
  }

  if (! ss.digitalRead(SS_SWITCH_SELECT)) {
    data->key = LV_KEY_ENTER;
    data->state = LV_INDEV_STATE_PRESSED;
  Serial.println("SELECT pressed!");
  } else { 
    data->key = LV_KEY_ENTER;
    data->state = LV_INDEV_STATE_RELEASED;
  }

  if (! ss.digitalRead(SS_SWITCH_LEFT)) {
    data->key = LV_KEY_LEFT;
    data->state = LV_INDEV_STATE_PRESSED;
  Serial.println("LEFT pressed!");
  } else { 
    data->key = LV_KEY_LEFT;
    data->state = LV_INDEV_STATE_RELEASED;
  }

  if (! ss.digitalRead(SS_SWITCH_RIGHT)) {
    data->key = LV_KEY_RIGHT;
    data->state = LV_INDEV_STATE_PRESSED;
  Serial.println("RIGHT pressed!");
  } else { 
    data->key = LV_KEY_RIGHT;
    data->state = LV_INDEV_STATE_RELEASED;
  }
}

What am I overlooking here? What have I not included/implemented?

Any assistance would be most appreciated.

Regards
Paul

2

I have managed to get navigation “working”.

Simple fix is to assign a lv_obj_flag_t to each label in the menu group.

Navigation “works” with Encoder, rotating CW and CCW → highlighted bar moves up and down the menu list as I wanted, center button on encoder selects/executes focused menu line item and moves screen onto a sub page correctly. I have managed to get only 1 KEYPAD button namely LV_KEY_NEXT working with the Encoder navigation.

I have create an encoder_indev and keypad_indev, added both to the menu group. I can still see my “debug” Serial messages but the data->key = LV_KEY_XXXX except NEXT does nothing on the screen.