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Problems showing more than one JPG image with 746D

Question asked by mich.lei on Jun 7, 2018
Latest reply on Jun 11, 2018 by mich.lei

I modified \STM32Cube\Repository\STM32Cube_FW_F7_V1.11.0\Projects\STM32746G-Discovery\Applications\LibJPEG example to show several images, see the code below, but images don't show. Only the first one is there whole. It looks like they may be kind on stacked top of each other.

 

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
FATFS SDFatFs;  /* File system object for SD card logical drive */
FIL MyFile;     /* File object */
char SDPath[4]; /* SD card logical drive path */
RGB_typedef *RGB_matrix; 
uint8_t   _aucLine[2048];
uint32_t  offset = 0;
uint32_t line_counter = 239;

/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void LCD_Config(void);
static uint8_t Jpeg_CallbackFunction(uint8_t* Row, uint32_t DataLength);
static void CPU_CACHE_Enable(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */

int main(void)
{
  /* Enable the CPU Cache */
  CPU_CACHE_Enable();

  /* STM32F7xx HAL library initialization:
       - Configure the Flash ART accelerator on ITCM interface
       - Systick timer is configured by default as source of time base, but user
         can eventually implement his proper time base source (a general purpose
         timer for example or other time source), keeping in mind that Time base
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
         handled in milliseconds basis.
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */

  HAL_Init();
 
  /* Configure the system clock to 200 MHz */
  SystemClock_Config();
 
  /*##-1- LCD Configuration ##################################################*/  
  LCD_Config();

  if(FATFS_LinkDriver(&SD_Driver, SDPath) == 0)
  {
     if(f_mount(&SDFatFs, (TCHAR const*)SDPath, 0) == FR_OK)
    {
 
               if(f_open(&MyFile, "ima_01.jpg", FA_READ) == FR_OK)
       {
       }
  jpeg_decode(&MyFile, IMAGE_WIDTH, _aucLine, Jpeg_CallbackFunction);
  f_close(&MyFile);
  BSP_LCD_DisplayStringAtLine(2, (uint8_t*)"f_close1");
     HAL_Delay(1000);

  if(f_open(&MyFile, "ima_02.jpg", FA_READ) == FR_OK)
       {
       }
  jpeg_decode(&MyFile, IMAGE_WIDTH, _aucLine, Jpeg_CallbackFunction);
  f_close(&MyFile);
  BSP_LCD_DisplayStringAtLine(2, (uint8_t*)"f_close2");
     HAL_Delay(1000);

  if(f_open(&MyFile, "ima_03.jpg", FA_READ) == FR_OK)
       {
       }
  jpeg_decode(&MyFile, IMAGE_WIDTH, _aucLine, Jpeg_CallbackFunction);
  f_close(&MyFile);
  BSP_LCD_DisplayStringAtLine(2, (uint8_t*)"f_close3");               
  HAL_Delay(1000);

if(f_open(&MyFile, "ima_04.jpg", FA_READ) == FR_OK)
       {
       }
   jpeg_decode(&MyFile, IMAGE_WIDTH, _aucLine, Jpeg_CallbackFunction);
   f_close(&MyFile);
   BSP_LCD_DisplayStringAtLine(2, (uint8_t*)"f_close4");
               

    }
    }
     

 
  /* Infinite loop */
  while (1)
  {
  }
}

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