Interfacing 4x4 keypad with 16x2 LCD on FPGA using VHDL

Sebastian M. (n30) OP 2021-10-07 23:05 #6841204

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Hello all! I have recently dived into the world of FPGA, and have 
challenged my self to see if you are able to take an input from a 4x4 
keypad and display the output on an 16x2 LCD utilizing the DE-10 LITE 
FPGA board on quartus. I have found out how to send the keypad inputs to 
seven segment display and how to utilize the LCD on it's own.. although 
now putting the two together is where I have hit a brick wall. As you 
all know there is not much VHDL resources online so if anyone has 
accomplished this please feel free to respond and lend a helping hand 
thank you!

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Duke Scarring Guest 2021-10-08 08:08 #6841327

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Can you show the internal interfaces of your keypad controller and your 
lcd controller?
Maybe you need a state machine to connect both things together.

My lcd controller looks like this:

entity lcd_controller is
    generic
        clk_frequency : integer := 10_000_000
    port 
        clk     : in  std_ulogic;
        line1   : std_ulogic_vector( 127 downto 0)   := ( others => '0');
        line2   : std_ulogic_vector( 127 downto 0)   := ( others => '0');
        update  : std_ulogic                         := '0';
        db      : out std_ulogic_vector(7 downto 0);
        rs      : out std_ulogic;
        rw      : out std_ulogic;
        en      : out std_ulogic
end entity lcd_controller;


Duke

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