I used a double PING_PONG DMA to increase the speed of the recording.
I compared text and binary: File = FS_FOpen (sdFile, "wb"); or pFile = FS_FOpen (sdFile, "w+"); and have not noticed any difference in speed of the recording.
I gave a link to my project here:
Even though the data bytes are in integer format we will need 8 bytes extra to convert to string and write it......But I dont know how to write so much of data at once.......
Say I have 100 bytes of data coverted to string so, 800 bytes ......but how to write all these bytes t once.....any method or example....