sd card problem

i use DE1 board i want to realize an audio project which i want to recorder my voice with the microphone in the sd card and then i want to listen to the voice which is recorder in the sd card

please any help i want a code in vhdl

i have a proposition that allows to speack in the mic and in the same time i listen to my self with the headphone . this part works very well but i want to recorder the voice in the sd card if i press to key1 and then if i press key2 i listen to the voice from the sd card

ANY HELP