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fopen cannot write memroy card

Kenmux Lee

I use lpc4357, and config file system & usb0 following the demo code of MCB4300.
The usb seems work, for I can read/write file via the usb interface.
When I create file failed by calling

fopen("TEXT.txt","w")

, it failed;
but, calling

fopen("TEXT.txt","rb")

seems ok (the return file handler not null if the file exist).
I just wander, what went wrong? Any idea is welcome!

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  • 0 in reply to edPer Westermark

    Thanks for your reply, Per Westermark!

    The device we are developing, will power up when plugging into usb port.
    And, it allows user to enter mass storage mode manually.

    So, the user may do some options (create/delete/rename/...) during the usb0 is on.
    If, I say if, the file system in the MDK does not allow to do that, then we will try to add some prompt to tell the user avoid a try.

Reply
  • 0 in reply to edPer Westermark

    Thanks for your reply, Per Westermark!

    The device we are developing, will power up when plugging into usb port.
    And, it allows user to enter mass storage mode manually.

    So, the user may do some options (create/delete/rename/...) during the usb0 is on.
    If, I say if, the file system in the MDK does not allow to do that, then we will try to add some prompt to tell the user avoid a try.

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