Kinetis Microcontrollers中的主题 Re: anyone have

anyone have

randyseedle — Tue, 09 Jul 2019 20:04:52 GMT

Anyone have an example of f_size. The file size function on the Kinetic 64 board (Freescale) . The reference manual doesn't want download over my phone .

Re: anyone have

randyseedle — Wed, 10 Jul 2019 20:24:26 GMT

The f_stat function doesn't seem to work either. Drilling down into the file info shows that the size is always zero.

Re: anyone have

danielchen — Thu, 11 Jul 2019 06:08:35 GMT

Hi Randy:

You refer to below code for the usage of f_size

middleware/fatfs/documents/res/app1.c

FRESULT open_append (
    FIL* fp,            /* [OUT] File object to create */
    const char* path    /* [IN] File name to be opened */
)
{
    FRESULT fr;

    /* Opens an existing file. If not exist, creates a new file. */
    fr = f_open(fp, path, FA_WRITE | FA_OPEN_ALWAYS);
    if (fr == FR_OK) {
        /* Seek to end of the file to append data */
        fr = f_lseek(fp, f_size(fp));
        if (fr != FR_OK)
            f_close(fp);
    }
    return fr;
}

Regards

Daniel

Re: anyone have

danielchen — Thu, 11 Jul 2019 06:13:33 GMT

For f_stat, you can refer to usb_examples

/usb_host_msd_fatfs/bm/host_msd_fatfs.c

...

fatfsCode = f_stat(_T("1:/dir_1"), &fileInfo);

...

I did a quick check and it could work on my side.

Regards

Daniel

Re: anyone have

randyseedle — Thu, 11 Jul 2019 20:11:58 GMT

After making some changes to my f_stat function I got a FR_NOT_ENABLED. What do you suppose that means ?

Randy

Re: anyone have

danielchen — Fri, 12 Jul 2019 05:18:18 GMT

Hi Randy:

Please refer to the error code

/* File function return code (FRESULT) */

typedef enum {
   FR_OK = 0,               /* (0) Succeeded */
   FR_DISK_ERR,           /* (1) A hard error occurred in the low level disk I/O layer */
   FR_INT_ERR,               /* (2) Assertion failed */
   FR_NOT_READY,           /* (3) The physical drive cannot work */
   FR_NO_FILE,               /* (4) Could not find the file */
   FR_NO_PATH,               /* (5) Could not find the path */
   FR_INVALID_NAME,       /* (6) The path name format is invalid */
   FR_DENIED,               /* (7) Access denied due to prohibited access or directory full */
   FR_EXIST,               /* (8) Access denied due to prohibited access */
   FR_INVALID_OBJECT,       /* (9) The file/directory object is invalid */
   FR_WRITE_PROTECTED,       /* (10) The physical drive is write protected */
   FR_INVALID_DRIVE,       /* (11) The logical drive number is invalid */
   FR_NOT_ENABLED,           /* (12) The volume has no work area */
   FR_NO_FILESYSTEM,       /* (13) There is no valid FAT volume */
   FR_MKFS_ABORTED,       /* (14) The f_mkfs() aborted due to any problem */
   FR_TIMEOUT,               /* (15) Could not get a grant to access the volume within defined period */
   FR_LOCKED,               /* (16) The operation is rejected according to the file sharing policy */
   FR_NOT_ENOUGH_CORE,       /* (17) LFN working buffer could not be allocated */
   FR_TOO_MANY_OPEN_FILES,   /* (18) Number of open files > FF_FS_LOCK */
   FR_INVALID_PARAMETER   /* (19) Given parameter is invalid */
} FRESULT;

Regards

Daniel