使用st官网的硬件 解码 jpg，只能解码一次是神马情况？
本帖最后由 hpdell 于 2017-5-20 16:43 编辑使用st官网的硬件 解码 jpg，只能解码一次是神马情况？
使用的是st官网提供的中断模式 解码 jpg
具体如下：
uint8_tJPEG_Display(char*_path)
{
uint32_t TimeBegin, TimeEnd;
uint32_t xPos = 0, yPos = 0;
FRESULTres;
FATFS * _jpeg_fs = 0;
DIR picdir; //图片目录
TimeBegin = HAL_GetTick();
_jpeg_fs= (FATFS *)mymalloc(SRAMIN, sizeof(FATFS));
if( (!_jpeg_fs) )
return 0xff;
/*##-4- Register the file system object to the FatFs module ##############*/
res = f_mount(_jpeg_fs, (TCHAR const*)"0:", 0); // == FR_OK)
if(res == FR_OK )
{
res = f_opendir(&picdir,(const TCHAR*)"0:Picture"); //打开目录
if(res != FR_OK)
return 3;
/*##-5- Open the JPG file with read access #############################*/
res = f_open(&JPEG_File, (TCHAR const*)_path, FA_READ);
if(res == FR_OK )
{
/*##-6- JPEG decoding with IT (Not Blocking ) Method ################*/
JPEG_Decode_IT(&JPEG_Handle, &JPEG_File, JPEG_OUTPUT_DATA_BUFFER);
/*##-7- Wait till end of JPEG decoding and perfom Input/Output Processing in BackGround#*/
do
{
JPEG_InputHandler(&JPEG_Handle);
JpegProcessing_End = JPEG_OutputHandler(&JPEG_Handle);
}while(JpegProcessing_End == 0); // 程序解码第二次时，会死在这个地方 ？？？
/*##-8- Get JPEG Info###############################################*/
HAL_JPEG_GetInfo(&JPEG_Handle, &JPEG_Info);
printf("JPEG_Info.ImageWidth = %d\r\n", JPEG_Info.ImageWidth);
printf("JPEG_Info.ImageHeight = %d\r\n", JPEG_Info.ImageHeight);
/*##-9- Copy RGB decoded Data to the display FrameBuffer############*/
if(( g_LcdDirection == 0) || (g_LcdDirection == 2))// 竖屏，竖屏180
{
xPos = (BSP_LCD_GetXSize() - JPEG_Info.ImageWidth)/ 2;
yPos = (BSP_LCD_GetYSize() - JPEG_Info.ImageHeight) / 2;
}
else// 横屏，横屏180
{
xPos = (BSP_LCD_GetYSize() - JPEG_Info.ImageWidth)/ 2;
yPos = (BSP_LCD_GetXSize() - JPEG_Info.ImageHeight) / 2;
}
JPEG_DMA2D_CopyBuffer((uint32_t *)JPEG_OUTPUT_DATA_BUFFER, (uint32_t *)JPEG_LCD_FRAME_BUFFER,
xPos , yPos,
JPEG_Info.ImageWidth, JPEG_Info.ImageHeight);
/*##-10- Close the JPG file ##########################################*/
// f_close(&JPEG_File);
}
else
{
printf("JPEG_Display f_open Error \r\n");
}
}
else
{
printf("JPEG_Display f_mount Error \r\n");
}
TimeEnd = HAL_GetTick();
printf("JPEGDisplayEnd ... ... %dms\r\n" ,TimeEnd - TimeBegin);
f_mount(NULL, (TCHAR const*)"0:", 0);
// 显示文件名
BSP_LTDC_DispStringAt(240, 1280/2-230, LCD_COLOR_BLUE,// 显示的文本颜色
LCD_COLOR_TRANSPARENT, // 显示的背景颜色
&FontAscii16x24,
(uint8_t *)_path); //
return 0;
}
int main(void)
{
... ...
JPEG_Display("0:dfdfd.jpg"); // 第一次能够正常解码并显示
JPEG_Display("0:dfdfd.jpg"); // 第二次就死在了上面的 do while里面了这是为何啊 ？？？？
}
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