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

eric2013

后实测下Alpha混合的性能。

1. /**
   
2.   * @brief  DMA2D Alpha blending bulk
   
3.   * @param  pColorFG : Foregroung color
   
4.   * @param  pColorBG : Backgroung color
   
5.   * @param  pColorDst: Destination color
   
6.   * @param  NumItems : Number of lines
   
7.   * @retval None
   
8.   */
   
9. static void _DMA_AlphaBlendingBulk(LCD_COLOR * pColorFG, LCD_COLOR * pColorBG, LCD_COLOR * pColorDst, U32 NumItems)
   
10. {  
    
11.   /* Wait if there is a transfer in progress */
    
12.   _DMA2D_ExecOperation();
    
13.   
    
14.   /* Take the TransferInProgress flag */
    
15.   TransferInProgress = 1;
    
16.   
    
17.   /* Setup DMA2D Configuration */  
    
18.   DMA2D->CR      = 0x00020000UL | (1 << 9);
    
19.   DMA2D->FGMAR   = (U32)pColorFG;
    
20.   DMA2D->BGMAR   = (U32)pColorBG;
    
21.   DMA2D->OMAR    = (U32)pColorDst;
    
22.   DMA2D->FGOR    = 0;
    
23.   DMA2D->BGOR    = 0;
    
24.   DMA2D->OOR     = 0;
    
25.   DMA2D->FGPFCCR = LTDC_PIXEL_FORMAT_ARGB8888;
    
26.   DMA2D->BGPFCCR = LTDC_PIXEL_FORMAT_ARGB8888;
    
27.   DMA2D->OPFCCR  = LTDC_PIXEL_FORMAT_ARGB8888;
    
28.   DMA2D->NLR     = (U32)(NumItems << 16) | 1;
    
29.   
    
30.   /* Start the transfer, and enable the transfer complete IT */
    
31.   DMA2D->CR     |= (1|DMA2D_IT_TC);
    
32.   
    
33.   /* Wait for the end of the transfer */
    
34.   _DMA2D_ExecOperation();
    
35. }
    
36. 
    
37. /**
    
38.   * @brief  Mixing bulk colors
    
39.   * @param  pColorFG : Foregroung color
    
40.   * @param  pColorBG : Backgroung color
    
41.   * @param  pColorDst: Destination color
    
42.   * @param  Intens   : Color intensity
    
43.   * @param  NumItems : Number of lines
    
44.   * @retval None
    
45.   */
    
46. static void _DMA_MixColorsBulk(LCD_COLOR * pColorFG, LCD_COLOR * pColorBG, LCD_COLOR * pColorDst, U8 Intens, U32 NumItems)
    
47. {
    
48.   /* Wait if there is a transfer in progress */
    
49.   _DMA2D_ExecOperation();
    
50.   
    
51.   /* Take the TransferInProgress flag */
    
52.   TransferInProgress = 1;
    
53. 
    
54.   /* Setup DMA2D Configuration */
    
55.   DMA2D->CR      = 0x00020000UL | (1 << 9);
    
56.   DMA2D->FGMAR   = (U32)pColorFG;
    
57.   DMA2D->BGMAR   = (U32)pColorBG;
    
58.   DMA2D->OMAR    = (U32)pColorDst;
    
59.   DMA2D->FGPFCCR = LTDC_PIXEL_FORMAT_ARGB8888
    
60.                  | (1UL << 16)
    
61.                  | ((U32)Intens << 24);
    
62.   DMA2D->BGPFCCR = LTDC_PIXEL_FORMAT_ARGB8888
    
63.                  | (0UL << 16)
    
64.                  | ((U32)(255 - Intens) << 24);
    
65.   DMA2D->OPFCCR  = LTDC_PIXEL_FORMAT_ARGB8888;
    
66.   DMA2D->NLR     = (U32)(NumItems << 16) | 1;
    
67.   
    
68.   /* Start the transfer, and enable the transfer complete IT */
    
69.   DMA2D->CR     |= (1|DMA2D_IT_TC);
    
70. 
    
71.   /* Wait for the end of the transfer */
    
72.   _DMA2D_ExecOperation();
    
73. }

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hpdell

看来后续的 gui 界面很快就要出来了哟，期待中 ...