text: /*
   * Copyright (c) 2006-2021, RT-Thread Development Team
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * Change Logs:
   * Date           Author       Notes
   * 2021-10-18     Meco Man     The first version
   */
  #include <lvgl.h>
  #include <drv_clcd.h>
  
  /*A static or global variable to store the buffers*/
  static lv_disp_draw_buf_t disp_buf;
  
  static rt_device_t lcd_device = 0;
  static struct rt_device_graphic_info info;
  
  static lv_disp_drv_t disp_drv;  /*Descriptor of a display driver*/
  
  /*Flush the content of the internal buffer the specific area on the display
   *You can use DMA or any hardware acceleration to do this operation in the background but
   *'lv_disp_flush_ready()' has to be called when finished.*/
  static void lcd_fb_flush(lv_disp_drv_t *disp_drv, const lv_area_t *area, lv_color_t *color_p)
  {
      uint32_t x;
      uint32_t y;
      uint32_t location = 0;
  
      /* 16 bit per pixel */
      lv_color16_t *fbp16 = (lv_color16_t *)info.framebuffer;
  
      for (y = area->y1; y <area->y2 + 1; y++)
      {
          for (x = area->x1; x <area->x2 + 1; x++)
          {
              location = x + y * info.width;
              fbp16[location].full = color_p->full;
              color_p++;
          }
      }
  
      lv_disp_flush_ready(disp_drv);
  }
  
  void lv_port_disp_init(void)
  {
      rt_err_t result;
      lv_color_t *fbuf1, *fbuf2;
  
      lcd_device = rt_device_find("lcd");
      if (lcd_device == 0)
      {
          rt_kprintf("error!\n");
          return;
      }
      result = rt_device_open(lcd_device, 0);
      if (result != RT_EOK)
      {
          rt_kprintf("error!\n");
          return;
      }
      /* get framebuffer address */
      result = rt_device_control(lcd_device, RTGRAPHIC_CTRL_GET_INFO, &info);
      if (result != RT_EOK)
      {
          rt_kprintf("error!\n");
          /* get device information failed */
          return;
      }
  
      RT_ASSERT(info.bits_per_pixel == 8 || info.bits_per_pixel == 16 ||
                info.bits_per_pixel == 24 || info.bits_per_pixel == 32);
  
      fbuf1 = rt_malloc(info.width * info.height * sizeof(lv_color_t));
      if (fbuf1 == RT_NULL)
      {
          rt_kprintf("Error: alloc disp buf fail\n");
          return;
      }
  
      fbuf2 = rt_malloc(info.width * info.height * sizeof(lv_color_t));
      if (fbuf2 == RT_NULL)
      {
          rt_kprintf("Error: alloc disp buf fail\n");
          rt_free(fbuf1);
          return;
      }
  
      /*Initialize `disp_buf` with the buffer(s). With only one buffer use NULL instead buf_2 */
      lv_disp_draw_buf_init(&disp_buf, fbuf1, fbuf2, info.width * info.height);
  
      lv_disp_drv_init(&disp_drv); /*Basic initialization*/
  
      /*Set the resolution of the display*/
      disp_drv.hor_res = info.width;
      disp_drv.ver_res = info.height;
  
      /*Set a display buffer*/
      disp_drv.draw_buf = &disp_buf;
  
      /*Used to copy the buffer's content to the display*/
      disp_drv.flush_cb = lcd_fb_flush;
  
      /*Finally register the driver*/
      lv_disp_drv_register(&disp_drv);
  }
  