/*********************************************************************************
 *      Copyright:  (C) 2021 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  lvgl_demo.c
 *    Description:  This file is LVGL demo program.
 *                 
 *        Version:  1.0.0(2021年09月27日)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "2021年09月27日 22时16分52秒"
 *                 
 ********************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
#include <time.h>
#include <sys/time.h>

#include "lvgl/lvgl.h"
#include "lv_drivers/display/fbdev.h"
#include "lv_drivers/indev/evdev.h"
#include "lv_demos/lv_demo.h"

#define DISP_BUF_SIZE (128 * 1024)


int main(void)
{
    lv_disp_drv_t               disp_drv;
    lv_indev_drv_t              indev_drv;
    static lv_color_t           buf[DISP_BUF_SIZE]; /* buffer for LVGL to draw the screen's content */
    static lv_disp_draw_buf_t   disp_buf; /* Initialize a descriptor for the buffer */

    /* LVGL context init */
    lv_init();

    /* Linux frame buffer device init */
    fbdev_init();

    /* linux touchscreen device init */
    lv_indev_drv_init(&indev_drv);
    indev_drv.type =LV_INDEV_TYPE_POINTER;
    indev_drv.read_cb =evdev_read;
    lv_indev_drv_register(&indev_drv);

    /* Initialize and register a display driver */
    lv_disp_draw_buf_init(&disp_buf, buf, NULL, DISP_BUF_SIZE);
    lv_disp_drv_init(&disp_drv);
    disp_drv.draw_buf   = &disp_buf;
    disp_drv.flush_cb = fbdev_flush;
    disp_drv.hor_res    = 800;
    disp_drv.ver_res    = 480;
    lv_disp_drv_register(&disp_drv);

    /* Create a Demo */
    //lv_demo_widgets();
    lv_demo_music();
    //lv_demo_keypad_encoder();
    //lv_demo_stress();

    /* Handle LitlevGL tasks (tickless mode) */
    while(1) {
        lv_task_handler();
        usleep(5000);
    }

    return 0;
}

/* Set in lv_conf.h as LV_TICK_CUSTOM_SYS_TIME_EXPR */
uint32_t millis(void)
{
    static uint64_t start_ms = 0;
    struct timeval tv_start;
    struct timeval tv_now;
    uint64_t now_ms;
    uint32_t time_ms;

    if(start_ms == 0) 
    {
        gettimeofday(&tv_start, NULL);
        start_ms = (tv_start.tv_sec * 1000000 + tv_start.tv_usec) / 1000;
    }

    gettimeofday(&tv_now, NULL);
    now_ms = (tv_now.tv_sec * 1000000 + tv_now.tv_usec) / 1000;

    time_ms = now_ms - start_ms;
    return time_ms;
}