Hi Ahmed,
[quote user="Ahmed Mokhtar"]1-While i am trying the example of fatsdraw which is provided with TI RTOS package it can only creates the file and doesn't write to it [/quote]
Can you elaborate on that? The example reads from input.txt (it creates it if it doesn't exist) and copies it to output.txt.
Also, by the way, when writing/reading less than 512 bytes (sector size), you'll have to call f_sync() or f_close before the data is actually written to the SD Card. FatFs "caches" a sector in the FIL data structure.
[quote user="Ahmed Mokhtar"]2- i'd like to ask if the file operations functions like f_open,f_write......etc are thread safe functions(i.e are they reentrant) [/quote]
Yes. The FatFs module has semaphore locks for reentrancy.
