SD card file rename?

Rayman

Anybody figured out how to rename a FAT16 file using fsrw or Femtofsrw?

It would be very convenient to have this ability right now for me...

Mike Green

It can't be done without modifying fsrw or Femtofsrw and writing a special routine to do it.

First you have to make sure there isn't a file already with the new name, then you have to
open the file under the old name, change the directory entry, and write it back. It's not too
different from deleting a file, but somebody has to do the work.

Oldbitcollector (Jeff)

Why not do this in two steps, and I think they are already there...

First copy the file to the new filename, then delete the old file.

IIRC, there is an example of copy & delete in Femto.

OBC


EDIT: yup thought I saw it in there... These could be adapted readily..

Copy

                 ' COPY [noparse][[/noparse]<expr>],"<file>" or COPY "<file>",[noparse][[/noparse]<expr>] or
                 ' COPY [noparse][[/noparse]<expr>],[noparse][[/noparse]<expr>] where <expr> are different
               if spaces == quote
                  scanFileName(@f0)
                  if spaces <> ","
                     abort @syn
                  skipspaces
                  b := getAddress(",") & !$7FFF
                  ifnot fsrw.checkPresence(b)
                     abort string("No EEPROM there")
                  if \fsrw.mount(spiDO,spiClk,spiDI,spiCS) < 0
                     abort string("Can't mount SD card")
                  if \fsrw.popen(@f0,"r")
                     abort string("Can't open file")
                  if fsrw.pread(@f0,32) <> 32
                     abort string("Can't read program")
                  if \fsrw.pclose < 0
                     abort string("Error closing file")
                  \fsrw.unmount
               else
                  a := getAddress(",") & !$7FFF
                  ifnot fsrw.checkPresence(a)
                     abort string("No EEPROM there")
                  if spaces <> ","
                     abort @syn
                  skipspaces
                  if spaces == quote
                     scanFileName(@f0)
                     if \fsrw.mount(spiDO,spiClk,spiDI,spiCS) < 0
                        abort string("Can't mount SD card")
                     if \fsrw.popen(@f0,"w")
                        abort string("Can't create file")
                     b := 0
                     if \fsrw.pclose < 0
                        abort string("Error closing file")
                     \fsrw.unmount

Delete

              ' DELETE " <file> "
               if spaces <> quote
                  abort @syn
               scanFilename(@f0)
               if \fsrw.mount(spiDO,spiClk,spiDI,spiCS) < 0
                  abort string("Can't mount SD card")
               if \fsrw.popen(@f0,"d")
                  abort string("Can't delete file")
               if \fsrw.pclose < 0
                  abort string("Error deleting file")
               \fsrw.unmount

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Post Edited (Oldbitcollector) : 12/1/2007 5:39:21 PM GMT

Rayman

This may be naive, but can't one just change characters in the FAT table?· Aren't all the filenames stored there?

Mike: Is this what you are saying?

Mike Green

Rayman,
That's essentially what I'm saying. It's just that you have to do it properly with the right error checking.