i need to interface a keypad 4x4 to xilinx spartan 3 starter kit board. the problem is that i need to use VHDL code so that the signal from the keypad will convert to ASCII code for the FPGA to read.

example

if i press button 1, the VHDL code will convert it to 0110001 (ASCII code for 1).

help me. its my school project.

 

Keypads are usually implemented as pushbutton switches located in a row and column matrix. The location of any key on the keypad can be based on two coordinates: the row and column position for that key. Then you can use a look-up table​

 

thnks for the reply. =)