STM32H7B芯片JPEG硬解以及DMA2D转换的问题
我想使用STM32H7B0进行JPEG图片的硬解，然后通过DMA2D将格式转为RGB565，缓存是初始化一个数组存储，然后使用SPI通讯ST7789芯片的显示屏传输缓存，显示图片。现在已经硬解完成了，卡在DMA2D格式转为RGB565这一步，想问问这个的路线可以实现吗?
static void DMA2D_CopyBuffer(uint32_t *pSrc, uint32_t *pDst, uint16_t x, uint16_t y, uint16_t xsize, uint16_t ysize, uint32_t ChromaSampling)
{
uint32_t cssMode = DMA2D_CSS_420, inputLineOffset = 0;
uint32_t destination = 0;
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;
}
}
/*##-1- Configure the DMA2D Mode, Color Mode and output offset #############*/
DMA2D_Handle.Init.Mode = DMA2D_M2M;
DMA2D_Handle.Init.ColorMode = DMA2D_OUTPUT_RGB565;
DMA2D_Handle.Init.OutputOffset = 240 - xsize;
DMA2D_Handle.Init.AlphaInverted = DMA2D_REGULAR_ALPHA;/* No Output Alpha Inversion*/
DMA2D_Handle.Init.RedBlueSwap = DMA2D_RB_REGULAR; /* No Output Red & Blue swap */
/*##-2- DMA2D Callbacks Configuration ######################################*/
DMA2D_Handle.XferCpltCallback= NULL;
/*##-3- Foreground Configuration ###########################################*/
DMA2D_Handle.LayerCfg.AlphaMode = DMA2D_REPLACE_ALPHA;
DMA2D_Handle.LayerCfg.InputAlpha = 0xFF;
DMA2D_Handle.LayerCfg.InputColorMode = DMA2D_INPUT_YCBCR;
DMA2D_Handle.LayerCfg.ChromaSubSampling = cssMode;
DMA2D_Handle.LayerCfg.InputOffset = inputLineOffset;
DMA2D_Handle.LayerCfg.RedBlueSwap = DMA2D_RB_REGULAR; /* No ForeGround Red/Blue swap */
DMA2D_Handle.LayerCfg.AlphaInverted = DMA2D_REGULAR_ALPHA; /* No ForeGround Alpha inversion */
DMA2D_Handle.Instance = DMA2D;
/*##-4- DMA2D Initialization ###########################################*/
HAL_DMA2D_Init(&DMA2D_Handle);
HAL_DMA2D_ConfigLayer(&DMA2D_Handle, 1);
/*##-5-copy the new decoded frame to the LCD Frame buffer ################*/
destination = (uint32_t)pDst + ((y *320) + x) * 2 ;// + ((y *320) + x) * 4
HAL_DMA2D_Start(&DMA2D_Handle, (uint32_t)pSrc, destination, xsize, ysize);
HAL_DMA2D_PollForTransfer(&DMA2D_Handle, 25);/* wait for the previous DMA2D transfer to ends */
这个是我使用例程的函数
由于我不是通过LTDC直接缓存刷入，这个函数是否需要修改？
整理了一个STM32H7的寄存器方式YCbCr转RGB函数并DMA2D到显示屏，支持采样比4:4:4，4:2:2和4:2:0
https://www.armbbs.cn/forum.php?mod=viewthread&tid=93536
C:\Users\rose\Desktop\1
运行之后目标地址的值还是0，DMA2D寄存器的值 还是0:'( 大佬，用这个函数运行之后目标地址的数值还是0，:'( Rose980 发表于 2024-1-31 16:38
大佬，用这个函数运行之后目标地址的数值还是0，
这个是完整的例子，供参考。
基于V7开发板的裸机和各种RTOS版本的emWin程序模板，支持硬件JPEG，已发布（2019-05-26）
https://www.armbbs.cn/forum.php?mod=viewthread&tid=93843&fromuid=58
(出处: 硬汉嵌入式论坛)
大佬，启动DMA2D之后寄存器的值还都是0，会不会是这个芯片和这个库函数有点差异啊，我直接用的HAL库的例程，和你的例程都是这样，JEPG可以解码，DMA2D寄存器都是0
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