Inkplate 6Flick ESP-IDF LVGL Hello World - Loops between black text on white, and white text on black, showing full and partial updates.

Inkplate 6Flick ESP-IDF LVGL Hello World.cpp

#include "sdkconfig.h"
#ifndef CONFIG_INKPLATE_BOARD_INKPLATE6FLICK
#error "Select Inkplate6Flick in menuconfig"
#endif
#include "Inkplate.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"

static Inkplate *display = nullptr;

static void createHelloWorld(bool topToBottom, bool inverted) {
    lv_obj_t *screen = lv_scr_act();
    lv_obj_clean(screen);

    lv_color_t bg = inverted ? lv_color_black() : lv_color_white();
    lv_color_t fg = inverted ? lv_color_white() : lv_color_black();

    lv_obj_set_style_bg_color(screen, bg, 0);
    lv_obj_set_style_bg_opa(screen, LV_OPA_COVER, 0);

    const char *text = "Hello World!";

    lv_obj_t *l1 = lv_label_create(screen);
    lv_obj_t *l2 = lv_label_create(screen);
    lv_obj_t *l3 = lv_label_create(screen);

    lv_label_set_text(l1, text);
    lv_label_set_text(l2, text);
    lv_label_set_text(l3, text);

    lv_obj_set_style_text_color(l1, fg, 0);
    lv_obj_set_style_text_color(l2, fg, 0);
    lv_obj_set_style_text_color(l3, fg, 0);

    lv_obj_set_style_text_font(l1, &lv_font_montserrat_14, 0);
    lv_obj_set_style_text_font(l2, &lv_font_montserrat_20, 0);
    lv_obj_set_style_text_font(l3, &lv_font_montserrat_28, 0);

    lv_obj_align(l1, LV_ALIGN_CENTER, 0, topToBottom ? -60 : 60);
    lv_obj_align(l2, LV_ALIGN_CENTER, 0, 0);
    lv_obj_align(l3, LV_ALIGN_CENTER, 0, topToBottom ? 60 : -60);
}

extern "C" void app_main(void) {
    display = new Inkplate(LV_DISPLAY_RENDER_MODE_PARTIAL);
    display->setDisplayMode(BLACK_AND_WHITE);
    display->setFullUpdateThreshold(0);
    display->frontlight.setState(false);

    int step = 0;
    bool topToBottom = true;

    while (true) {
        bool inverted = (step >= 2);
        bool full = (step == 0 || step == 2);

        createHelloWorld(topToBottom, inverted);

        lv_refr_now(lv_display_get_default());

        if (full)
            display->display();
        else
            display->partialUpdate(true, true);

        vTaskDelay(pdMS_TO_TICKS(1000));

        topToBottom = !topToBottom;
        step = (step + 1) % 4;
    }
}