LCD Display

DIO2 Board CPLD

DIO2 Board

• CPLD Interface

• LCD Display

DIO2 circuit board block diagram

FC16

clkclrTP

M

mclkbn

ProgramROM

P

M

DIO2main

clkdivcclk

IBUFG

clr clkled

oewe

cs

LCD_RW

LCD_RS

LCD_E

T(5:0) addr(5:0)

N

E1

Data(7:0)buff3

Top Level Design

library IEEE;use IEEE.STD_LOGIC_1164.all;

entity buff3 isgeneric (width:positive);port(

input : in STD_LOGIC_vector(width-1 downto 0); en : in STD_LOGIC; output : out STD_LOGIC_vector(width-1 downto 0)

);end buff3;

architecture buff3 of buff3 isbegin

output <= input when en = '1' else (others => 'Z');end buff3;

buff3.vhden

outputinput

DIO2 CPLD VHDL Codelibrary IEEE;use IEEE.STD_LOGIC_1164.ALL;use IEEE.STD_LOGIC_ARITH.ALL;use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity d2io is Port ( btns : in std_logic_vector(14 downto 0); switchs : in std_logic_vector(7 downto 0); leds : out std_logic_vector(15 downto 0); data : inout std_logic_vector(7 downto 0); addr : in std_logic_vector(5 downto 0); sseg : out std_logic_vector(6 downto 0); ssegdp : out std_logic; ssegsel : out std_logic_vector(3 downto 0); cs : in std_logic; we : in std_logic; oe : in std_logic; clk256 : in std_logic);end d2io;

architecture rtl of d2io is

signal data_out : std_logic_vector(7 downto 0);signal sseg_reg : std_logic_vector(15 downto 0);signal digit : std_logic_vector(3 downto 0);signal count : unsigned(1 downto 0);signal leds_i : std_logic_vector(15 downto 0);

signal strobe : std_logic;

begin

ssegdp <= '1';

data <= data_out when (oe = '1' and cs = '1') else (others => 'Z');

data_out <= btns(7 downto 0) when addr(1 downto 0) = "00" else '0'& btns(14 downto 8) when addr(1 downto 0) = "01" else switchs;

strobe <= cs and we;

leds <= not(leds_i);

process(strobe)begin

if(falling_edge(strobe)) thencase addr is

when "000100" =>leds_i(7 downto 0) <= data;

when "000101" =>leds_i(15 downto 8) <= data;

when "000110" =>sseg_reg(15 downto 8) <= data;

when "000111" =>sseg_reg(7 downto 0) <= data;

when others => NULL;end case;

end if;end process;

process(clk256)begin

if(rising_edge(clk256)) thencount <= count + 1;

end if;end process;

with count selectdigit <= sseg_reg(7 downto 4) when "00",

sseg_reg(3 downto 0) when "01", sseg_reg(15 downto 12) when "10", sseg_reg(11 downto 8) when others;

process(count)begin

ssegsel <= (others => '0');ssegsel(conv_integer(count)) <= '1';

end process;

with digit select sseg <= "1001111" when "0001", --1

"0010010" when "0010", --2"0000110" when "0011", --3"1001100" when "0100", --4"0100100" when "0101", --5"0100000" when "0110", --6"0001111" when "0111", --7"0000000" when "1000", --8"0000100" when "1001", --9"0001000" when "1010", --A"1100000" when "1011", --b"0110001" when "1100", --C"1000010" when "1101", --d"0110000" when "1110", --E"0111000" when "1111", --F"0000001" when others; --0

end rtl;

DIO2 Board

• CPLD Interface

• LCD Display

DIO2 circuit board block diagram

when LCDistore =>LCD_RW <= '0'; LCD_RS <= '0';pinc <= '0';

if ccycle < 7 then LCD_E <= '1';else tload <= '1'; nload <= '1';

tsel <= "111"; nsel <= "01"; dpop <= '1';

end if;

when LCDdstore =>LCD_RW <= '0'; LCD_RS <= '1';pinc <= '0';

if ccycle < 7 then LCD_E <= '1';else tload <= '1'; nload <= '1';

tsel <= "111"; nsel <= "01"; dpop <= '1';

end if;

In wc16_control add….

LCDinst! ( data 0 .. )

LCDdata! ( data 0 .. )

Lcd3.whp\ LCD for Digilab DIO2\ LCD3.WHP HEX : 1ms_Delay ( -- )

30D1 FOR NEXT ; : 30ms.Delay ( -- ) 1E FOR 1ms_Delay NEXT ; : hex2asc ( n -- asc ) 0F AND \ mask upper nibble DUP 9 > \ if n > 9 IF 37 + \ add $37 ELSE 30 + \ else add $30 THEN ;

Lcd3.whp

: lcd.init ( -- )30ms.delay

3C 0 LCDinst! \ 2 x 40 display1ms_Delay

0f 0 LCDinst! \ display on1ms_Delay

1 0 LCDinst! \ display clear 1ms_Delay 1ms_Delay 6 0 LCDinst! \ entry cursor shift off

1ms_Delay ;

: hex>lcd ( hex -- ) HEX2ASC 0 LCDdata!

30ms.delay; : u.lcd ( u -- ) \display T on LCD

DUP C RSHIFThex>lcdDUP 8 RSHIFThex>lcdDUP 4 RSHIFThex>lcdhex>lcd ;

Lcd3.whp

: MAIN ( -- ) lcd.init BEGIN waitB4 S@ \ get high byte

DUP DIG!DUP hex>lcd8 LSHIFTwaitB4 S@ \ get low byteORDUP DIG!DUP hex>lcdwaitB4 u.lcd \ display on lcd

AGAIN ;

Lcd3.whp