STM32H7的DMA2D做Alpha混合和颜色混合比之前F429方便很多了

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楼主 | 2018-8-9 18:16 | 只看该作者回帖奖励

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Alpha, STM32H7, DMA, pc, TI

后实测下Alpha混合的性能。

/**
  * @brief  DMA2D Alpha blending bulk
  * @param  pColorFG : Foregroung color
  * @param  pColorBG : Backgroung color
  * @param  pColorDst: Destination color
  * @param  NumItems : Number of lines
  * @retval None
  */
static void _DMA_AlphaBlendingBulk(LCD_COLOR * pColorFG, LCD_COLOR * pColorBG, LCD_COLOR * pColorDst, U32 NumItems)
{
  /* Wait if there is a transfer in progress */
  _DMA2D_ExecOperation();

  /* Take the TransferInProgress flag */
  TransferInProgress = 1;

  /* Setup DMA2D Configuration */
  DMA2D->CR    = 0x00020000UL | (1 << 9);
  DMA2D->FGMAR = (U32)pColorFG;
  DMA2D->BGMAR = (U32)pColorBG;
  DMA2D->OMAR = (U32)pColorDst;
  DMA2D->FGOR = 0;
  DMA2D->BGOR = 0;
  DMA2D->OOR    = 0;
  DMA2D->FGPFCCR = LTDC_PIXEL_FORMAT_ARGB8888;
  DMA2D->BGPFCCR = LTDC_PIXEL_FORMAT_ARGB8888;
  DMA2D->OPFCCR  = LTDC_PIXEL_FORMAT_ARGB8888;
  DMA2D->NLR    = (U32)(NumItems << 16) | 1;

  /* Start the transfer, and enable the transfer complete IT */
  DMA2D->CR    |= (1|DMA2D_IT_TC);

  /* Wait for the end of the transfer */
  _DMA2D_ExecOperation();
}

/**
  * @brief  Mixing bulk colors
  * @param  pColorFG : Foregroung color
  * @param  pColorBG : Backgroung color
  * @param  pColorDst: Destination color
  * @param  Intens : Color intensity
  * @param  NumItems : Number of lines
  * @retval None
  */
static void _DMA_MixColorsBulk(LCD_COLOR * pColorFG, LCD_COLOR * pColorBG, LCD_COLOR * pColorDst, U8 Intens, U32 NumItems)
{
  /* Wait if there is a transfer in progress */
  _DMA2D_ExecOperation();

  /* Take the TransferInProgress flag */
  TransferInProgress = 1;

  /* Setup DMA2D Configuration */
  DMA2D->CR    = 0x00020000UL | (1 << 9);
  DMA2D->FGMAR = (U32)pColorFG;
  DMA2D->BGMAR = (U32)pColorBG;
  DMA2D->OMAR = (U32)pColorDst;
  DMA2D->FGPFCCR = LTDC_PIXEL_FORMAT_ARGB8888
               | (1UL << 16)
               | ((U32)Intens << 24);
  DMA2D->BGPFCCR = LTDC_PIXEL_FORMAT_ARGB8888
               | (0UL << 16)
               | ((U32)(255 - Intens) << 24);
  DMA2D->OPFCCR  = LTDC_PIXEL_FORMAT_ARGB8888;
  DMA2D->NLR    = (U32)(NumItems << 16) | 1;

  /* Start the transfer, and enable the transfer complete IT */
  DMA2D->CR    |= (1|DMA2D_IT_TC);

  /* Wait for the end of the transfer */
  _DMA2D_ExecOperation();
}复制代码

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STM32H7的DMA2D做Alpha混合和颜色混合比之前F429方便很多了

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