转：【STM32746G-Discovery】双层图像显示

两层时的配置与一层时的配置很类似。

第一图层配置

位置从（0，0）到（320，240）

图像地址为L8_320x240

图像大小为320*240

查看原代码
  pLayerCfg.WindowX0 = 0;
  pLayerCfg.WindowX1 = 320;
  pLayerCfg.WindowY0 = 0;
  pLayerCfg.WindowY1 = 240;
  
  /* Pixel Format configuration*/
  pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_L8;
  
  /* Start Address configuration : frame buffer is located at FLASH memory */
  pLayerCfg.FBStartAdress = (uint32_t)&L8_320x240;
  
  /* Alpha constant (255 totally opaque) */
  pLayerCfg.Alpha = 255;
  
  /* Default Color configuration (configure A,R,G,B component values) */
  pLayerCfg.Alpha0 = 0;
  pLayerCfg.Backcolor.Blue = 0;
  pLayerCfg.Backcolor.Green = 0;
  pLayerCfg.Backcolor.Red = 0;
  
  /* Configure blending factors */
  pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;
  pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;
  
  /* Configure the number of lines and number of pixels per line */
  pLayerCfg.ImageWidth = 320;
  pLayerCfg.ImageHeight = 240;
第一图层配置

位置从（160，32）到（480，272）

图像地址为RGB565_320x240

图像大小为320*240

查看原代码
  pLayerCfg1.WindowX0 = 160;
  pLayerCfg1.WindowX1 = 480;
  pLayerCfg1.WindowY0 = 32;
  pLayerCfg1.WindowY1 = 272;
  
  /* Pixel Format configuration*/
  pLayerCfg1.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;
  
  /* Start Address configuration : frame buffer is located at FLASH memory */
  pLayerCfg1.FBStartAdress = (uint32_t)&RGB565_320x240;
  
  /* Alpha constant (255 totally opaque) */
  pLayerCfg1.Alpha = 200;
  
  /* Default Color configuration (configure A,R,G,B component values) */
  pLayerCfg1.Alpha0 = 0;
  pLayerCfg1.Backcolor.Blue = 0;
  pLayerCfg1.Backcolor.Green = 0;
  pLayerCfg1.Backcolor.Red = 0;
  
  /* Configure blending factors */
  pLayerCfg1.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;
  pLayerCfg1.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;
  
  /* Configure the number of lines and number of pixels per line */
  pLayerCfg1.ImageWidth = 320;
  pLayerCfg1.ImageHeight = 240;  

以下程序，将图层1移动到图层2的位置，简单的动画

查看原代码
    for (index = 0; index < 32; index++)
    {
      /* calculate new picture position */
       PicturesPosition(&Xpos1, &Ypos1, &Xpos2, &Ypos2, (index+1));
      
       /* reconfigure the layer1 position  without Reloading*/
       HAL_LTDC_SetWindowPosition_NoReload(&LtdcHandle, Xpos1, Ypos1, 0);
       /* reconfigure the layer2 position  without Reloading*/
       HAL_LTDC_SetWindowPosition_NoReload(&LtdcHandle, Xpos2, Ypos2, 1);
       /*Ask for LTDC reload within next vertical blanking*/
       ReloadFlag = 0;
       HAL_LTDC_Reload(&LtdcHandle,LTDC_RELOAD_VERTICAL_BLANKING);

      while(ReloadFlag == 0)
      {
        /* wait till reload takes effect (in the next vertical blanking period) */
      }
    }
以下程序，还原两个图层的位置。最后的运行结果就是两个图层上的两个图像反复变换位置。

查看原代码
for (index = 0; index < 32; index++)
    {
      /* calculate new picture position */
       PicturesPosition(&Xpos2, &Ypos2, &Xpos1, &Ypos1, (index+1));
      
       /* reconfigure the layer1 position  without Reloading*/
       HAL_LTDC_SetWindowPosition_NoReload(&LtdcHandle, Xpos1, Ypos1, 0);
       /* reconfigure the layer2 position  without Reloading*/
       HAL_LTDC_SetWindowPosition_NoReload(&LtdcHandle, Xpos2, Ypos2, 1);
       /*Ask for LTDC reload within next vertical blanking*/
       ReloadFlag = 0;
       HAL_LTDC_Reload(&LtdcHandle,LTDC_RELOAD_VERTICAL_BLANKING);

      while(ReloadFlag == 0)
      {
        /* wait till reload takes effect (in the next vertical blanking period) */
      }
    }

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