LCD+JPEG 解码记忆体空间问题

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hans5966 提问时间：2019-12-25 09:37 /

各位好！

想与各位请教，目前我正在使用JPEG解码器将图片从SD卡解码后显示到LCD，同时有显示问题，程序参考STM32H7官方JPEG，检查过后扩大Chunk值后有一点改善，可是仍然部分少图。

/* Private define ------------------------------------------------------------*/
#define CHUNK_SIZE_IN ((uint32_t)(64 * 1024))//(4096)) //
#define CHUNK_SIZE_OUT ((uint32_t)(64 * 1024))//(64 * 1024))
#define JPEG_BUFFER_EMPTY 0
#define JPEG_BUFFER_FULL 1
#define NB_OUTPUT_DATA_BUFFERS 2
#define NB_INPUT_DATA_BUFFERS 2
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
FIL *pFile; /* pointer to File object */
uint8_t JPEG_Data_InBuffer0[CHUNK_SIZE_IN];
uint8_t JPEG_Data_InBuffer1[CHUNK_SIZE_IN];
JPEG_Data_BufferTypeDef Jpeg_IN_BufferTab[NB_INPUT_DATA_BUFFERS] =
{
{JPEG_BUFFER_EMPTY , JPEG_Data_InBuffer0, 0},
{JPEG_BUFFER_EMPTY , JPEG_Data_InBuffer1, 0}
};

复制代码

uint32_t JPEG_Decode_DMA(JPEG_HandleTypeDef *hjpeg, FIL *file, uint32_t DestAddress)
{
uint32_t i;
pFile = file;
FrameBufferAddress = DestAddress;
/* Read from JPG file and fill input buffers */
for(i = 0; i < NB_INPUT_DATA_BUFFERS; i++)
{
if(f_read (pFile, Jpeg_IN_BufferTab[i].DataBuffer , CHUNK_SIZE_IN, (UINT*)(&Jpeg_IN_BufferTab[i].DataBufferSize)) == FR_OK)
{
Jpeg_IN_BufferTab[i].State = JPEG_BUFFER_FULL;
}
else
{
Error_Handler();
}
}
/* Start JPEG decoding with DMA method */
HAL_JPEG_Decode_DMA(hjpeg ,Jpeg_IN_BufferTab[0].DataBuffer ,Jpeg_IN_BufferTab[0].DataBufferSize ,(uint8_t *)FrameBufferAddress ,CHUNK_SIZE_OUT);
return 0;
}