STM32F4 DMA2D_R2M

時間 2019-12-01

標籤 stm32f4 stm dma2d dma r2m 简体版

原文原文鏈接

圖像處理的專門DMAide

看一段示例代碼函數

 1 /**
 2   * @brief  Displays a line.
 3   * @param Xpos: specifies the X position.
 4   * @param Ypos: specifies the Y position.
 5   * @param Length: line length.
 6   * @param Direction: line direction.
 7   *   This parameter can be one of the following values: Vertical or Horizontal.
 8   * @retval None
 9   */
10 void LCD_DrawLine(uint16_t Xpos, uint16_t Ypos, uint16_t Length, uint8_t Direction)
11 {
12   DMA2D_InitTypeDef      DMA2D_InitStruct;
13   
14   uint32_t  Xaddress = 0;
15   uint16_t Red_Value = 0, Green_Value = 0, Blue_Value = 0;
16   
17   Xaddress = CurrentFrameBuffer + 2*(LCD_PIXEL_WIDTH*Ypos + Xpos);
18  
19   Red_Value = (0xF800 & CurrentTextColor) >> 11;
20   Blue_Value = 0x001F & CurrentTextColor;
21   Green_Value = (0x07E0 & CurrentTextColor) >> 5;
22 
23   /* Configure DMA2D */    
24   DMA2D_DeInit();  
25   DMA2D_InitStruct.DMA2D_Mode = DMA2D_R2M;       
26   DMA2D_InitStruct.DMA2D_CMode = DMA2D_RGB565;      
27   DMA2D_InitStruct.DMA2D_OutputGreen = Green_Value;      
28   DMA2D_InitStruct.DMA2D_OutputBlue = Blue_Value;     
29   DMA2D_InitStruct.DMA2D_OutputRed = Red_Value;                
30   DMA2D_InitStruct.DMA2D_OutputAlpha = 0x0F;                  
31   DMA2D_InitStruct.DMA2D_OutputMemoryAdd = Xaddress;                  
32   
33   if(Direction == LCD_DIR_HORIZONTAL)
34   {                                                      
35     DMA2D_InitStruct.DMA2D_OutputOffset = 0;                
36     DMA2D_InitStruct.DMA2D_NumberOfLine = 1;            
37     DMA2D_InitStruct.DMA2D_PixelPerLine = Length; 
38   }
39   else
40   {                                                            
41     DMA2D_InitStruct.DMA2D_OutputOffset = LCD_PIXEL_WIDTH - 1;                
42     DMA2D_InitStruct.DMA2D_NumberOfLine = Length;            
43     DMA2D_InitStruct.DMA2D_PixelPerLine = 1;  
44   }
45   
46   DMA2D_Init(&DMA2D_InitStruct);  
47   /* Start Transfer */ 
48   DMA2D_StartTransfer();  
49   /* Wait for CTC Flag activation */
50   while(DMA2D_GetFlagStatus(DMA2D_FLAG_TC) == RESET)
51   {
52   }
53   
54 }

LCD_DrawLine

裏面很差理解的是offset那塊，其餘統一模式設置看看手冊便可，這個offset設置咱們先看寄存器是哪一個ui

/* Configure the line Offset */
DMA2D->OOR &= ~(uint32_t)DMA2D_OOR_LO;
DMA2D->OOR |= (DMA2D_InitStruct->DMA2D_OutputOffset);spa

寄存器定義：3d

再看代碼那幾句：code

if(Direction == LCD_DIR_HORIZONTAL)
{
DMA2D_InitStruct.DMA2D_OutputOffset = 0;
DMA2D_InitStruct.DMA2D_NumberOfLine = 1;
DMA2D_InitStruct.DMA2D_PixelPerLine = Length;
}
else
{
DMA2D_InitStruct.DMA2D_OutputOffset = LCD_PIXEL_WIDTH - 1;
DMA2D_InitStruct.DMA2D_NumberOfLine = Length;
DMA2D_InitStruct.DMA2D_PixelPerLine = 1;
}orm

if裏很明白，在指定位置沒有offset畫一條length長的線blog

else是畫的豎線，因此每行只畫一個點，畫length條線，因此每行只畫一個點，offset的值就是：LCD_PIXEL_WIDTH - 1ip

發現不一樣MODE有不少不一樣理解故深化一下看看初始化函數內部操做的哪些寄存器進一步理解ci

 1 /**
 2   * @brief  Initializes the DMA2D peripheral according to the specified parameters
 3   *         in the DMA2D_InitStruct.
 4   * @note   This function can be used only when the DMA2D is disabled.
 5   * @param  DMA2D_InitStruct: pointer to a DMA2D_InitTypeDef structure that contains
 6   *         the configuration information for the specified DMA2D peripheral.
 7   * @retval None
 8   */
 9 void DMA2D_Init(DMA2D_InitTypeDef* DMA2D_InitStruct)
10 {
11 
12   uint32_t outgreen = 0;
13   uint32_t outred   = 0;
14   uint32_t outalpha = 0;
15   uint32_t pixline  = 0;
16 
17   /* Check the parameters */
18   assert_param(IS_DMA2D_MODE(DMA2D_InitStruct->DMA2D_Mode));
19   assert_param(IS_DMA2D_CMODE(DMA2D_InitStruct->DMA2D_CMode));
20   assert_param(IS_DMA2D_OGREEN(DMA2D_InitStruct->DMA2D_OutputGreen));
21   assert_param(IS_DMA2D_ORED(DMA2D_InitStruct->DMA2D_OutputRed));
22   assert_param(IS_DMA2D_OBLUE(DMA2D_InitStruct->DMA2D_OutputBlue));
23   assert_param(IS_DMA2D_OALPHA(DMA2D_InitStruct->DMA2D_OutputAlpha));
24   assert_param(IS_DMA2D_OUTPUT_OFFSET(DMA2D_InitStruct->DMA2D_OutputOffset));
25   assert_param(IS_DMA2D_LINE(DMA2D_InitStruct->DMA2D_NumberOfLine));
26   assert_param(IS_DMA2D_PIXEL(DMA2D_InitStruct->DMA2D_PixelPerLine));
27 
28   /* Configures the DMA2D operation mode */
29   DMA2D->CR &= (uint32_t)CR_MASK;
30   DMA2D->CR |= (DMA2D_InitStruct->DMA2D_Mode);
31 
32   /* Configures the color mode of the output image */
33   DMA2D->OPFCCR &= ~(uint32_t)DMA2D_OPFCCR_CM;
34   DMA2D->OPFCCR |= (DMA2D_InitStruct->DMA2D_CMode);
35 
36   /* Configures the output color */
37 
38   if (DMA2D_InitStruct->DMA2D_CMode == DMA2D_ARGB8888)
39   {
40     outgreen = DMA2D_InitStruct->DMA2D_OutputGreen << 8;
41     outred = DMA2D_InitStruct->DMA2D_OutputRed << 16;
42     outalpha = DMA2D_InitStruct->DMA2D_OutputAlpha << 24;
43   }
44   else
45   
46     if (DMA2D_InitStruct->DMA2D_CMode == DMA2D_RGB888)
47     {
48       outgreen = DMA2D_InitStruct->DMA2D_OutputGreen << 8;
49       outred = DMA2D_InitStruct->DMA2D_OutputRed << 16;
50       outalpha = (uint32_t)0x00000000;
51     }
52      
53   else
54 
55     if (DMA2D_InitStruct->DMA2D_CMode == DMA2D_RGB565)
56     {
57       outgreen = DMA2D_InitStruct->DMA2D_OutputGreen << 5;
58       outred = DMA2D_InitStruct->DMA2D_OutputRed << 11;
59       outalpha = (uint32_t)0x00000000;
60     }
61 
62   else
63 
64     if (DMA2D_InitStruct->DMA2D_CMode == DMA2D_ARGB1555)
65     {  
66       outgreen = DMA2D_InitStruct->DMA2D_OutputGreen << 5;
67       outred = DMA2D_InitStruct->DMA2D_OutputRed << 10;
68       outalpha = DMA2D_InitStruct->DMA2D_OutputAlpha << 15;
69     }
70 
71   else /* DMA2D_CMode = DMA2D_ARGB4444 */
72   {
73     outgreen = DMA2D_InitStruct->DMA2D_OutputGreen << 4;
74     outred = DMA2D_InitStruct->DMA2D_OutputRed << 8;
75     outalpha = DMA2D_InitStruct->DMA2D_OutputAlpha << 12;
76   }  
77   DMA2D->OCOLR |= ((outgreen) | (outred) | (DMA2D_InitStruct->DMA2D_OutputBlue) | (outalpha));
78 
79   /* Configures the output memory address */
80   DMA2D->OMAR = (DMA2D_InitStruct->DMA2D_OutputMemoryAdd);
81 
82   /* Configure  the line Offset */
83   DMA2D->OOR &= ~(uint32_t)DMA2D_OOR_LO;
84   DMA2D->OOR |= (DMA2D_InitStruct->DMA2D_OutputOffset);
85 
86   /* Configure the number of line and pixel per line */
87   pixline = DMA2D_InitStruct->DMA2D_PixelPerLine << 16; 
88   DMA2D->NLR &= ~(DMA2D_NLR_NL | DMA2D_NLR_PL);
89   DMA2D->NLR |= ((DMA2D_InitStruct->DMA2D_NumberOfLine) | (pixline));

DMA2D_Init

DMA2D_InitStruct.DMA2D_Mode = DMA2D_R2M; // DMA2D->CR
DMA2D_InitStruct.DMA2D_CMode = DMA2D_RGB565; // DMA2D->OPFCCR
DMA2D_InitStruct.DMA2D_OutputGreen = Green_Value; // DMA2D->OCOLR
DMA2D_InitStruct.DMA2D_OutputBlue = Blue_Value; //   DMA2D->OCOLR
DMA2D_InitStruct.DMA2D_OutputRed = Red_Value; //   DMA2D->OCOLR
DMA2D_InitStruct.DMA2D_OutputAlpha = 0x0F; //   DMA2D->OCOLR
DMA2D_InitStruct.DMA2D_OutputMemoryAdd = Xaddress; // DMA2D->OMAR

DMA2D_InitStruct.DMA2D_OutputOffset = 0; // DMA2D->OOR
DMA2D_InitStruct.DMA2D_NumberOfLine = 1; // DMA2D->NLR
DMA2D_InitStruct.DMA2D_PixelPerLine = Length; // DMA2D->NLR

沒有FG（foreground）和 BG（background）直接輸出image到Memory

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