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f_write

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The f_write writes data to a file.

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-FRESULT f_write (
-  FIL* fp,          /* [IN] Pointer to the file object structure */
-  const void* buff, /* [IN] Pointer to the data to be written */
-  UINT btw,         /* [IN] Number of bytes to write */
-  UINT* bw          /* [OUT] Pointer to the variable to return number of bytes written */
-);
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Parameters

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fp
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Pointer to the open file object structure.
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buff
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Pointer to the data to be written.
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btw
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Specifies number of bytes to write in range of UINT type.
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bw
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Pointer to the UINT variable to return the number of bytes written. The value is always valid after the function call regardless of the result.
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Return Values

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-FR_OK, -FR_DISK_ERR, -FR_INT_ERR, -FR_NOT_READY, -FR_INVALID_OBJECT, -FR_TIMEOUT -

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Description

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The read/write pointer of the file object advances number of bytes written. After the function succeeded, *bw should be checked to detect the disk full. In case of *bw is less than btw, it means the volume got full during the write operation. The function can take a time when the volume is full or close to full.

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QuickInfo

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Available when _FS_READONLY == 0.

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See Also

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f_open, f_read, fputc, fputs, fprintf, f_close, FIL

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Return

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