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

SGoel.2
Associate III

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....

4 REPLIES 4
SGoel.2
Associate III

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 >= 😎

   {

    // 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.

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

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

Mshar.2
Associate II

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