S35390A_SD-MMC_FatEngine Help - change dir and list files

Mike G · 2011-06-11 10:07

I'm moving from Kye's FAT 2.0 to the new S35390A_SD-MMC_FatEngine. I invoke the changeDirectory method then listEntries("N") but keep getting the root directory listing. What is the proper syntax to change directory then list the files in the current working directory?

   pst.str(string(13, "CD Style> "))
   pst.str(SDCard.changeDirectory(string("style")))
   pst.char(13)

   repeat 10
    pst.str(string("SDCard.listEntries(N)> "))
    pst.str(SDCard.listEntries("N"))
    pst.char(13)

Mike G · 2011-06-11 10:11

Figures... I was messing with this for a while last night and this morning. Then I post - then I figure it out... I think anyway. I'm not sure why you have to invoke listEntries("W") first.

W = Wrap
N = Next

   pst.str(string(13, "CD Style> "))
   pst.str(SDCard.changeDirectory(string("style")))
   pst.char(13)
   pst.str(SDCard.listEntries("W"))
   repeat 10
    pst.str(string("SDCard.listEntries(N)> "))
    pst.str(SDCard.listEntries("N"))
    pst.char(13)

Kye · 2011-06-11 18:24

Unlike in the old driver the "listEntries" function now is not linked to the directory pointer shared by all other file system rountines. This allows for advanced features like "deleting all files ina direcotry" or "opening all files in a directory".

Before you couldn't do that because the file system pointers would reset themselves after executing a different file system function.

I think it's a small price to pay for more functionality.

Thanks,

S35390A_SD-MMC_FatEngine Help - change dir and list files

Comments