FreeRTOS+FAT is still in the lab
FreeRTOS+FAT is already in use in commercial products
and we encourage you to try it yourself. Be aware however that
FreeRTOS+FAT was acquired by Real Time Engineers Ltd., and is
still being documented and updated to
ensure it meets our strict quality standards.
Please use the forum for support,
or contact us directly if you have a specific business interest.
File related functions in the standard C library often return 0 for pass,
and -1 for fail. If -1 is returned then the reason for the failure is
stored in a variable called errno, which must be inspected separately.
FreeRTOS+FAT's standard stdio style interface maintains an errno variable
for each RTOS task. ff_errno() returns the errno value for the calling
The file system's native API
has a more sophisticated error code system, and
returns error codes directly from its API functions.
void vAFunction( FF_FILE *pxFile, long lOffset, int iWhence )
/* Attempt to seek a file using the parameters passed into this function. */
iReturned = ff_fseek( pxFile, lOffset, iWhence );
if( iReturned == 0 )
/* The call to ff_fseek() passed. */
/* The call to ff_fseek() failed. Obtain the errno to see why. */
iReturned = ff_errno();
if( iReturned == pdFREERTOS_ERRNO_ESPIPE )
/* The seep position was illegal - outside of the file's space. */
else if( iReturned == pdFREERTOS_ERRNO_EINVAL )
/* The value of iWhence was not legal. */