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Original question:

CC3220: Checking for SD card is inserted when not using card detection pin

RTOS/MSP432P4111: RTOS/MSP432P4111

user5724612
Intellectual 340 points

Part Number: MSP432P4111

Tool/software: TI-RTOS

I had the same problem and your solution works. The problem is that f_mount returns FR_OK only if the first time is called there is a microSD in the shueld. If there is not one and f_mount is called once, the seocnd time is called (now with a microSD inside the shuield) it does not return FR_OK.

Does this have any solution?

Thank you.

  • 0
    TI__Mastermind 22580 points
    Hello,

    The "fatsd" example uses the SDFatFS driver. It looks like this driver is written to be called only once by the application.

    I will do some more tests and get back.

    Thanks,
    Sai
  • 0 in reply to Sai Reddy
    Intellectual 340 points

    Good morning, 

    Do you have any good news on this topic?

    Thank you.

  • 0 in reply to user5724612
    TI__Mastermind 22580 points

    I was able to try the following scenario successfully by modifying "fatsd" example.

    • SD card not inserted
      • Call "SDFatFS_open" (returns valid handle)
      • Call fopen in "w+" mode (returns NULL handler)
      • Call "SDFatFS_close" (with the handle returned by SDFatFS_open)
    • SD card inserted
      • Call "SDFatFS_open" (returns valid handle)
      • Call fopen (returns valid handler)

    The following is the code snippet to run with the above scenario. This code snippet is a modification of the fatsd.c file.

        bool bFirst = true;
    
    /* Run a loop till fopen returns a valid handle */
    while(sdfatfsHandle == NULL)
    {
        /* Mount and register the SD Card */
        sdfatfsHandle = SDFatFS_open(Board_SDFatFS0, DRIVE_NUM);
        if (sdfatfsHandle == NULL) {
            Display_printf(display, 0, 0, "Error starting the SD card\n");
            while(1);
        }

        /* Try to open the source file */
        /* Open file for both reading and writing */
        src = fopen(inputfile, "w+");
        if (!src) {
            if(bFirst)
            {
                Display_printf(display, 0, 0, "SD card not found.\nPlease "
                        "insert SD Card\n");
                bFirst = false;
            }

            /* SD card might not have been inserted. Unmount and unregister
             * the SD card. */
            SDFatFS_close(sdfatfsHandle);

            /* Clear the handle to try to mount the SD card again in the hope
             * that SD card is inserted. */
            sdfatfsHandle = NULL;
        }
        else{
            /* If we reached here, it means the SD card is inserted and a file
             *  has been opened for reading and writing */
            Display_printf(display, 0, 0, "SD Card is inserted\n");
        }
    }

    fwrite(textarray, 1, strlen(textarray), src);
    fflush(src);

    /* Reset the internal file pointer */
    rewind(src);

    Display_printf(display, 0, 0, "New file created\n");

    This code snippet should be included between the following lines in the file fatsd.c

        Display_printf(display, 0, 0,
        "You will get errors if your SD card is not formatted with a filesystem.\n");

    /* Now output the outputfile[] contents onto the console */
    dst = fopen(outputfile, "r");
    if (!dst) {

    Hope this helps!

    Thanks,

    Sai

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