DMA2D_Copy_YCbCr_To_RGB

//使用时注意第62行的g_LcdWidth是表示显示屏的宽度
//以及输出是RGB565格式还是ARGB8888格式。

/*

---

• 函 数 名: DMA2D_Copy_YCbCr_To_RGB
• 功能说明: YCbCr转RGB输出
• 形 参: pSrc: 数据源地址
• pDst: 数据目的地址
• x: X轴首地址
• y: Y轴首地址
• xsize: 目的区域的X轴大小，即每行像素数
• ysize: 目的区域的Y轴大小，即行数
• PixelFormat： 目标区颜色格式
• ChromaSampling : YCbCr Chroma sampling : 4:2:0, 4:2:2 or 4:4:4

• 返 回 值: 无

  ---

  /
  static void DMA2D_Copy_YCbCr_To_RGB(uint32_t pSrc,
  uint32_t *pDst,
  uint16_t x,
  uint16_t y,
  uint16_t xsize,
  uint16_t ysize,
  uint32_t PixelFormat,
  uint32_t ChromaSampling)
  {
  uint32_t cssMode = DMA2D_CSS_420;
  uint32_t inputLineOffset = 0;
  uint32_t destination = 0;

  /* 处理输入行偏移 */
  if(ChromaSampling == JPEG_420_SUBSAMPLING)
  {
          cssMode = DMA2D_CSS_420;
  
          inputLineOffset = xsize % 16;
          if(inputLineOffset != 0)
          {
                  inputLineOffset = 16 - inputLineOffset;
          }   
  }
  else if(ChromaSampling == JPEG_444_SUBSAMPLING)
  {
          cssMode = DMA2D_NO_CSS;
  
          inputLineOffset = xsize % 8;
          if(inputLineOffset != 0)
          {
                  inputLineOffset = 8 - inputLineOffset;
          }   
  }
  else if(ChromaSampling == JPEG_422_SUBSAMPLING)
  {
          cssMode = DMA2D_CSS_422;
  
          inputLineOffset = xsize % 16;
          if(inputLineOffset != 0)
          {
                  inputLineOffset = 16 - inputLineOffset;
          }      
  }  
  
  /* 输出地址，特别注意末尾乘以2的对RGB565，如果输出格式是ARGB8888，需要乘以4 */
  destination = (uint32_t)pDst + ((y * g_LcdWidth) + x) * 2;
  
  /* DMA2D采用存储器到存储器模式，并且执行FPC颜色格式转换, 这种模式是前景层作为DMA2D输入 */  
  DMA2D->CR      = 0x00010000UL | (1 << 9);
  DMA2D->OOR     = g_LcdWidth - xsize;
  
  /* 输出格式 */
  DMA2D->OPFCCR  = PixelFormat
                   | (DMA2D_REGULAR_ALPHA << 20)
                   | (DMA2D_RB_REGULAR << 21);  
  
  /* 前景层输入格式 */        
  DMA2D->FGPFCCR = DMA2D_INPUT_YCBCR
                   | (DMA2D_REPLACE_ALPHA << 16)
                   | (DMA2D_REGULAR_ALPHA << 20)
                   | (DMA2D_RB_REGULAR << 21)   
                   | (0xFFU << 24)              
                   | (cssMode << 18);               
  
  DMA2D->FGOR    = inputLineOffset;
  DMA2D->NLR     = (uint32_t)(xsize << 16) | (uint16_t)ysize;      
  DMA2D->OMAR    = (uint32_t)destination;
  DMA2D->FGMAR   = (uint32_t)pSrc;  
  
  /* 启动传输 */
  DMA2D->CR   |= DMA2D_CR_START;   
  
  /* 等待DMA2D传输完成 */
  while (DMA2D->CR & DMA2D_CR_START) {}

  }