请教下，使用dma2d的透明功能改如何设置？

hpdell 提问时间：2018-1-14 17:02 /

请教下，使用dma2d的透明功能改如何设置？

配置函数如下

static void BMP_DMA2D_ConverBuffer(uint32_t *pSrc, uint32_t *pDst,
                                 uint16_t _usX, uint16_t _usY,
                                 uint16_t _usWidth, uint16_t _usHeight,
                                 uint32_t InputColorMode, uint32_t OutputColorMode)
{

  uint32_t source ;
  uint32_t destination = 0;

uint16_t  OutputOffset = 0;    // 行偏移
uint16_t  NumberOfLine = 0;    // 行数,表示我们显示的数据需要的行数
uint16_t  PixelPerLine = 0;       // 每行像素数, 每行需要显示多少个像素点

  __IO uint32_t  XaddrPutPixel = 0;
  source    = (uint32_t)pSrc;
  destination = (uint32_t)pDst;

  XaddrPutPixel = (BYTES_PER_PIXEL * (uint32_t)((_usY * LCD_PIXEL_WIDTH) + (_usX)));
  OutputOffset =  LCD_PIXEL_WIDTH - _usWidth;
  NumberOfLine =  _usHeight ;
  PixelPerLine =  _usWidth  ;

  __HAL_RCC_DMA2D_FORCE_RESET();          // 强制复位
  __HAL_RCC_DMA2D_RELEASE_RESET();          // 释放复位

  DMA2D->CR    &= ~DMA2D_CR_START; // 停止dma2d

  DMA2D_Handle.Init.Mode       = DMA2D_M2M_PFC;
  DMA2D_Handle.Init.OutputOffset  = OutputOffset;       //OutputOffset;
  DMA2D_Handle.Init.AlphaInverted = DMA2D_REGULAR_ALPHA;  // No Output Alpha Inversion
  DMA2D_Handle.LayerCfg[1].AlphaMode = DMA2D_REPLACE_ALPHA;
  DMA2D_Handle.LayerCfg[1].InputAlpha = 0xFF;

  DMA2D_Handle.Init.RedBlueSwap = DMA2D_RB_REGULAR;

  DMA2D_Handle.XferCpltCallback  = NULL;

  DMA2D_Handle.LayerCfg[1].InputColorMode = InputColorMode; // 输入颜色模式
  DMA2D_Handle.Init.ColorMode          = OutputColorMode;  // 输出颜色模式

  DMA2D_Handle.LayerCfg[1].InputOffset = 0;
  DMA2D_Handle.LayerCfg[1].RedBlueSwap = DMA2D_RB_REGULAR; /* No ForeGround Red a Blue swap */
  DMA2D_Handle.LayerCfg[1].AlphaInverted = DMA2D_REGULAR_ALPHA; /* No ForeGround Alpha inversion */
  DMA2D_Handle.Instance       = DMA2D;

  if(HAL_DMA2D_Init(&DMA2D_Handle) == HAL_OK)
  {
if(HAL_DMA2D_ConfigLayer(&DMA2D_Handle, 1) == HAL_OK)
{
   uint32_t timeout = 0;

      if (HAL_DMA2D_Start(&DMA2D_Handle, source, destination + XaddrPutPixel, PixelPerLine, NumberOfLine ) == HAL_OK)
      {
         while((DMA2D->ISR & (DMA2D_FLAG_TC)) == 0)    //等待传输完成
         {
            timeout++;
            if(timeout > 0X1FFFFF) break;       //超时退出
         }

         __HAL_DMA2D_CLEAR_FLAG(&DMA2D_Handle, DMA2D_FLAG_TC | DMA2D_FLAG_CTC);
         DMA2D_Handle.State = HAL_DMA2D_STATE_READY;
         __HAL_UNLOCK(&DMA2D_Handle);

      }
}
  }
}