Hlo Everyone, Hope youare doing well !! I wanna ask one thing about Fatfs in stm32.

[SGoel.2]

I have written a program for write a data in SD card and after that read it. but in my program F_open function returns Fr_DISK_ERROR error and jumps outside the loop and terminates the execution whereas i have declared and defined all the necessary things and files. My card is connected with SPI and i have declared it.

Anyone tell me how can it works....

[SGoel.2]

I have attached the complete main code of our programme in which i am not getting ny output.

Please check this code also !!

void check_SD_interface(void)

// Reads & writes config.txt file on SD card

{

 U8 au8Key_pressed, au8StoredVolume;

 UINT aupN_bytes_rwPtr[1];

 short aNBytes_to_write;

 tKeyinfo_t atpKeyPressedInfo[1];

 FRESULT aFResult;

 send_str_to_debugUART_n_wait_till_sent("\r\nChecking SDC interface");

 // Read / create config.txt file from SDC

 f_mount(&USERFatFs, "" ,0) ; // Returns FR_OK even if there is no SD card!

 // Mounting the file system forcefully does not return FR_OK even when SD card is present!!

 aFResult = f_open(&USERFile, "config.txt", FA_READ);

  if(aFResult != FR_OK)

  {

   // may be it is the first power on for this SD card

   // Try to open file for WRITE

   aFResult = f_open(&USERFile, "config.txt", (FA_WRITE | FA_CREATE_NEW));

   if(aFResult == FR_OK)

   {

    // config file opened for writing

    // Write {"Vol":5}

    // f_write (FIL* fp, const void* buff, UINT btw, UINT* bw); // Write data to the file

    //                01 2345 678

    strcpy((char *)gu8pSdd_rw_buffer,"{\"Vol\":");

    strcat((char *)gu8pSdd_rw_buffer, num_string(INIT_VOLUME_SETTING, UNSIGNED, 1, NO_DECIMAL));

    strcat((char *)gu8pSdd_rw_buffer, "}");

    aNBytes_to_write = strlen((char *)gu8pSdd_rw_buffer);

    // Write data to the file

    aFResult = f_write (&USERFile, (const void *)gu8pSdd_rw_buffer, aNBytes_to_write, aupN_bytes_rwPtr);

    if(aFResult == FR_OK)

    {

     gB_sd_card_present = TRUE;

    }

    f_close(&USERFile);

   }  // config.txt file opened for writing

  }  // f_open() returned error

  else

  {

   // config.txt file opened for reading

   f_read(&USERFile, gu8pSdd_rw_buffer, SDD_SECTOR_SIZE, aupN_bytes_rwPtr);

   if (*aupN_bytes_rwPtr >= 8)

   {

    // At least one config parm is there

    if (strncmp((char *)(gu8pSdd_rw_buffer + 2), "Vol", 3) == 0)

    {

     // It is "Vol" parm, read gu8Set_volume value

     gu8Set_volume = gu8Stored_volume = gu8pSdd_rw_buffer[7] - 0x30;

     // ASSUMED that it is within limits

    } // It is "Vol" parm

    gB_sd_card_present = TRUE;

   }  // 8 or more char in config.txt file

  }  // config.txt file opened for reading

  f_close(&USERFile);  // Checking of SD card & reading/creating config.txt file is over

  au8StoredVolume = INIT_VOLUME_SETTING;

  if (gB_sd_card_present)

  {

   send_str_to_debugUART_n_wait_till_sent("\r\nSuccessfully read/created config.txt file on SDC");

  }

  else

  {

   send_str_to_debugUART_n_wait_till_sent("\r\nUnable to read/created config.txt file on SDC");

   return;

  }

 while (1)

 {

  send_str_to_debugUART_n_wait_till_sent("\r\nPress Incr volume / Decrement volume key" \

   "to read storedVolume from config.txt file on SDC and write it back");

// Remove any pending keys in the key Q

while (BSP_check_for_key_press(atpKeyPressedInfo)) osDelay(100);

  // Wait for Incr vol / decr vol key   

  while (!BSP_check_for_key_press(atpKeyPressedInfo))

  {

   // No key pressed

   // Check if user pressed Enter on debug terminal

   if ((osEventFlagsGet(debugUartEventHandle) & EVT_ENTER_PRESSED) == EVT_ENTER_PRESSED)

   {

    osEventFlagsClear ( debugUartEventHandle,

           (EVT_ESC_PRESSED | EVT_ENTER_PRESSED | EVT_Y_ENTER_PRESSED | EVT_N_ENTER_PRESSED));

    // Start receiving char from index 0

    return;  // Test over

   }

   osDelay(10);

  }

  // A key pressed

  aFResult = f_open(&USERFile, "config.txt", FA_READ);

  if( aFResult == FR_OK)

  {

   f_read(&USERFile, (void *)gu8pSdd_rw_buffer, SDD_SECTOR_SIZE, aupN_bytes_rwPtr);  // Assumed it returns FR_OK

   au8StoredVolume = gu8pSdd_rw_buffer[7] - 0x30;

   f_close(&USERFile);

  }

  au8Key_pressed = atpKeyPressedInfo->fu8Kb_val;

  switch (au8Key_pressed)

  {

  case KBVAL_KEY_INCR_VOLUME:

   if (gu8Set_volume < MAX_VOLUME) gu8Set_volume++;

   copy_str_to_debugUart_tx_buffer("\r\nVolume: ");

   cat_str_to_debugUart_tx_buffer(BSP_u16_to_str((U16)gu8Set_volume, REMOVE_LEADING_ZEROES));

   break;

  case KBVAL_KEY_DECR_VOLUME:

   if (gu8Set_volume > MIN_VOLUME) gu8Set_volume--;

   copy_str_to_debugUart_tx_buffer("\r\nVolume: ");

   cat_str_to_debugUart_tx_buffer(BSP_u16_to_str((U16)gu8Set_volume, REMOVE_LEADING_ZEROES));

   break;

  }  // switch (au8Key_pressed)

  send_debug_tx_line_n_wait_till_sent();

  // Write the modified gu8Set_volume to SDC

  aFResult = f_open(&USERFile, "config.txt", FA_WRITE);

  if(aFResult != FR_OK)

  {

   // File write error!

   f_close(&USERFile);

   send_str_to_debugUART_n_wait_till_sent("\r\nFile write error!");

   return;

  }

  else

  {

   // config file opened for writing

   // Write {"Vol":au8StoredVolume}

   // f_write (FIL* fp, const void* buff, UINT btw, UINT* bw); // Write data to the file

   //                01 2345 678

   strcpy((char *)gu8pSdd_rw_buffer,"{\"Vol\":");

   strcat((char *)gu8pSdd_rw_buffer, num_string(au8StoredVolume, UNSIGNED, 1, NO_DECIMAL));

   strcat((char *)gu8pSdd_rw_buffer, "}");

   aNBytes_to_write = strlen((char *)gu8pSdd_rw_buffer);

   // Write data to the file

   aFResult = f_write (&USERFile, (const void *)gu8pSdd_rw_buffer, aNBytes_to_write, aupN_bytes_rwPtr);

   f_close(&USERFile);

   if (aFResult == FR_OK)

   {

    send_str_to_debugUART_n_wait_till_sent("\r\nFile written successfully");

   }

   else

   {

    send_str_to_debugUART_n_wait_till_sent("\r\nFile write error!");

    return;

   }

  }  // config.txt file opened for writing

 }  // while (1)

}

// ----- end of check_SD_interface() -----

I have found error in the [[[aFResult = f_open(&USERFile, "config.txt", (FA_WRITE | FA_CREATE_NEW));

   if(aFResult == FR_OK)]]] function and after getting the error execution goes to the end of the else statement.

[Tesla DeLorean]

Instrument DISKIO layer, understand why it fails. The file system is dependent on it functioning correctly. ​

[SGoel.2]

@Community member​ But How Can I Check it ??

[Mshar.2]

@SGoel.2​ have you found the answer? can you attach your stm32 project here. I'm having same problem