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Check the directory and parent directory access mode, and mount options for the flash (just run mount). Linux will remount the filesystem read-only if there are problems writing to it; if that has...

Here are the three POSIX.1-2008 C functions I would use for something like this:

error = verify_directory(parent, directory);

This function verifies that directory exists, relative to parent.
...

Just realized that this:

creates a directory with access mode d------rwx, which denies access to both the user and the group. Please use
mkdir(mStoredFreqIntervalDetails, 0777);
The 0777 means...

If you modify your code to


#define FREQINTDIR "/htvclnsvc/"

static Bool mWritetoFlashFreqInt(void)
{
FILE *fptr;

memset(mStoredFreqIntervalDetails, '\0', MAX_URISIZE);