关于DMA2D填充色块的问题

发布于 2023-08-16 17:45:13 浏览：409 订阅该版

我使用的硬件设备是ART-Pi加正点原子的7寸RGB分辨率为1024*600，今天在进行DMA2D填充色块实验的时候不知道为啥我照着原子的代码写的但是我的只能设置色块的宽度设置高度不起效果，这是为啥？求助社区大佬帮忙?我把我LTDC初始化的代码贴出来

```c
/* LTDC init function */
这是初始LTDC的
void MX_LTDC_Init(void)
{

/* USER CODE BEGIN LTDC_Init 0 */

/* USER CODE END LTDC_Init 0 */

LTDC_LayerCfgTypeDef pLayerCfg = {0};

/* USER CODE BEGIN LTDC_Init 1 */

/* USER CODE END LTDC_Init 1 */
  hltdc.Instance = LTDC;
  hltdc.Init.HSPolarity = LTDC_HSPOLARITY_AL;
  hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AL;
  hltdc.Init.DEPolarity = LTDC_DEPOLARITY_AL;
  hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
  hltdc.Init.HorizontalSync = 1;
  hltdc.Init.VerticalSync = 1;
  hltdc.Init.AccumulatedHBP = 47;
  hltdc.Init.AccumulatedVBP = 24;
  hltdc.Init.AccumulatedActiveW = 1071;
  hltdc.Init.AccumulatedActiveH = 624;
  hltdc.Init.TotalWidth = 1261;
  hltdc.Init.TotalHeigh = 646;
  hltdc.Init.Backcolor.Blue = 0;
  hltdc.Init.Backcolor.Green = 0;
  hltdc.Init.Backcolor.Red = 0;
  if (HAL_LTDC_Init(&hltdc) != HAL_OK)
  {
    Error_Handler();
  }
  pLayerCfg.WindowX0 = 0;
  pLayerCfg.WindowX1 = 1024;
  pLayerCfg.WindowY0 = 0;
  pLayerCfg.WindowY1 = 600;
  pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB888;
  pLayerCfg.Alpha = 255;
  pLayerCfg.Alpha0 = 0;
  pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
  pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
  pLayerCfg.FBStartAdress = 0xC0000000;
  pLayerCfg.ImageWidth = 0;
  pLayerCfg.ImageHeight = 0;
  pLayerCfg.Backcolor.Blue = 0;
  pLayerCfg.Backcolor.Green = 0;
  pLayerCfg.Backcolor.Red = 0;
  if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN LTDC_Init 2 */

/* USER CODE END LTDC_Init 2 */

}
下面是填充色块的代码
uint16_t framebuf[1280][800] __attribute__((at(0xC0000000)));	//定义最大屏分辨率时,LCD所需的帧缓存数组大小

void dma2d_file(uint16_t sx,uint16_t sy,uint16_t ex,uint16_t ey,uint32_t color)
{
	
	uint32_t addr;
	uint32_t offlien=0;
	addr=(uint32_t)framebuf+2*(1024*sy+sx);
	
	offlien=1024-(ex-sx+1);
	
	DMA2D->CR	  	 &=	~(DMA2D_CR_START);						// 停止DMA2D
	DMA2D->CR				=	DMA2D_R2M;										// 寄存器到SDRAM
	DMA2D->OPFCCR		=	LTDC_PIXEL_FORMAT_RGB888;			// 设置颜色格式
	
	DMA2D->OMAR			=	addr ;								// 地址
	DMA2D->OOR      = offlien;
	
	DMA2D->NLR      =((ex-sx+1)<<16)|(ey-sy+1);
	
	DMA2D->OCOLR		=	color;												// 颜色
	
	DMA2D->CR	  	|=	DMA2D_CR_START;								// 启动DMA2D
		
	while ((DMA2D->ISR & DMA2D_FLAG_TC)==0) ;						// 等待传输完成
	DMA2D->IFCR |= DMA2D_FLAG_TC;
}

dma2d_file(0,0,200,200,0xff00ff00);

```
最后的效果是这样的

![微信图片_20230816174444.jpg](https://oss-club.rt-thread.org/uploads/20230816/d67674c9f8c3a69a561bdb6e312f4587.jpg.webp)