6 years, 4 months ago.

MBED SD Card File system not compiling on VisualGDB

Hi

I am using VisualGDB with MBED STM32L476 (DISCO L476).

I want to interface the CPU to a SD card. I imported the SD Card File system

https://os.mbed.com/cookbook/SD-Card-File-System

Which is debugged, compiles and works great on MBED compiler.

The problem is I get these bugs in FATFileHandle.h after compilation in VisualGDB:

conflicting return type specified for ‘virtual off_t FATFileHandle::size()’

1. ifndef MBED_FATFILEHANDLE_H
2. define MBED_FATFILEHANDLE_H

1. include “FileHandle.h”

using namespace mbed;

class FATFileHandle : public FileHandle { public:

FATFileHandle(FIL fh); virtual int close(); virtual ssize_t write(const void* buffer, size_t length); virtual ssize_t read(void* buffer, size_t length); virtual int isatty(); virtual off_t lseek(off_t position, int whence); virtual int fsync(); virtual off_t flen();

virtual off_t seek(off_t position, int whence) { return lseek(position, whence); } virtual off_t size() { return flen(); }

protected:

FIL _fh;

};

1. endif

and also in FileHandle.h:

overriding ‘virtual size_t mbed::FileHandle::size()’

1. ifndef MBED_FILEHANDLE_H
2. define MBED_FILEHANDLE_H

typedef int FILEHANDLE;

1. include <stdio.h>
2. include “platform/platform.h”

namespace mbed { / \addtogroup drivers */ / @{*/

/ Class FileHandle

• An abstract interface that represents operations on a file-like
• object. The core functions are read, write, and seek, but only
• a subset of these operations can be provided.
• @note to create a file, @see File
• @note Synchronization level: Set by subclass
• / class FileHandle { public: virtual FileHandle() {}

/ Read the contents of a file into a buffer

• @param buffer The buffer to read in to
• @param size The number of bytes to read
• @return The number of bytes read, 0 at end of file, negative error on failure
• / virtual ssize_t read(void *buffer, size_t size) = 0;

/ Write the contents of a buffer to a file

• @param buffer The buffer to write from
• @param size The number of bytes to write
• @return The number of bytes written, negative error on failure
• / virtual ssize_t write(const void *buffer, size_t size) = 0;

/ Move the file position to a given offset from from a given location

• @param offset The offset from whence to move to
• @param whence The start of where to seek
• SEEK_SET to start from beginning of file,
• SEEK_CUR to start from current position in file,
• SEEK_END to start from end of file
• @return The new offset of the file
• / virtual off_t seek(off_t offset, int whence = SEEK_SET) = 0;

/ Close a file

• @return 0 on success, negative error code on failure
• / virtual int close() = 0;

/ Flush any buffers associated with the file

• @return 0 on success, negative error code on failure
• / virtual int sync() { return 0; }

/ Check if the file in an interactive terminal device

• @return True if the file is a terminal
• / virtual int isatty() { return false; }

/ Get the file position of the file

• @note This is equivalent to seek(0, SEEK_CUR)
• @return The current offset in the file
• / virtual off_t tell() { return seek(0, SEEK_CUR); }

/ Rewind the file position to the beginning of the file

• @note This is equivalent to seek(0, SEEK_SET)
• / virtual void rewind() { seek(0, SEEK_SET); }

/ Get the size of the file

• @return Size of the file in bytes
• / virtual size_t size() { off_t off = tell(); size_t size = seek(0, SEEK_END); seek(off, SEEK_SET); return size; }

/ Move the file position to a given offset from a given location.

• @param offset The offset from whence to move to
• @param whence SEEK_SET for the start of the file, SEEK_CUR for the
• current file position, or SEEK_END for the end of the file.
• @returns
• new file position on success,
• -1 on failure or unsupported
• / MBED_DEPRECATED_SINCE(“mbed-os-5.4”, “Replaced by FileHandle::seek”) virtual off_t lseek(off_t offset, int whence) { return seek(offset, whence); }

/ Flush any buffers associated with the FileHandle, ensuring it

• is up to date on disk
• @returns
• 0 on success or un-needed,
• -1 on error
• / MBED_DEPRECATED_SINCE(“mbed-os-5.4”, “Replaced by FileHandle::sync”) virtual int fsync() { return sync(); }

/ Find the length of the file

• @returns
• Length of the file
• / MBED_DEPRECATED_SINCE(“mbed-os-5.4”, “Replaced by FileHandle::size”) virtual off_t flen() { return size(); } };

/ @}*/ } namespace mbed

1. endif

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