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LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.all;
USE IEEE.STD_LOGIC_ARITH.all;
USE IEEE.STD_LOGIC_UNSIGNED.all;
-- This code displays time in the UP3's LCD Display
-- SW8 (GLOBAL RESET) resets time
ENTITY UP3_CLOCK IS
PORT(reset, clk_48Mhz,D ,K,D3,D4 : IN STD_LOGIC;--復位，時鐘信號，按鍵輸入定義
LCD_RS, LCD_E, RESET_LED, SEC_LED,Q_LED : OUT STD_LOGIC;--使能端，LED指示燈輸出定義
LCD_RW ,Q : BUFFER STD_LOGIC;--
DATA_BUS : INOUT STD_LOGIC_VECTOR(7 DOWNTO 0);--1602數據端口
SW3 : IN STD_LOGIC_VECTOR(3 DOWNTO 0));--
END UP3_CLOCK;
ARCHITECTURE a OF UP3_CLOCK IS
TYPE STATE_TYPE IS (HOLD, FUNC_SET, DISPLAY_ON, MODE_SET, WRITE_CHAR1,
WRITE_CHAR2,WRITE_CHAR3,WRITE_CHAR4,WRITE_CHAR5,WRITE_CHAR6,WRITE_CHAR7,
WRITE_CHAR8, WRITE_CHAR9, WRITE_CHAR10, RETURN_HOME, TOGGLE_E, RESET1, RESET2,
RESET3, DISPLAY_OFF, DISPLAY_CLEAR);
TYPE CNT IS RANGE 0 TO 9;
SIGNAL state, next_command: STATE_TYPE;
SIGNAL DATA_BUS_VALUE: STD_LOGIC_VECTOR(7 DOWNTO 0);
SIGNAL CLK_COUNT_100HZ,CLK_COUNT_400HZ: STD_LOGIC_VECTOR(19 DOWNTO 0);
SIGNAL CLK_COUNT_2HZ,B1,B2,B3: STD_LOGIC_VECTOR(7 DOWNTO 0);
SIGNAL BCD_SECD0,BCD_SECD1,BCD_MIND0,BCD_MIND1: STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL BCD_HRD0,BCD_HRD1,BCD_TSEC,S1,S2,BCD_3CAI: STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL CLK_400HZ, CLK_100HZ,D1 ,D0,CLK_2HZ: STD_LOGIC;
SIGNAL COUNT:INTEGER RANGE 0 TO 200;
SIGNAL COUNT1,COUNT2:INTEGER RANGE 0 TO 40;
BEGIN
--1602數據總線
DATA_BUS <= DATA_BUS_VALUE WHEN LCD_RW = '0' ELSE "ZZZZZZZZ";
PROCESS
BEGIN
WAIT UNTIL CLK_48MHZ'EVENT AND CLK_48MHZ = '1';
IF RESET = '0' THEN
CLK_COUNT_400HZ <= X"00000";
CLK_400HZ <= '0';
ELSE
IF CLK_COUNT_400HZ < X"0EA60" THEN
CLK_COUNT_400HZ <= CLK_COUNT_400HZ + 1;
ELSE
CLK_COUNT_400HZ <= X"00000";
CLK_400HZ <= NOT CLK_400HZ;
END IF;
IF CLK_COUNT_100HZ < 240000 THEN
CLK_COUNT_100HZ <= CLK_COUNT_100HZ + 1;
ELSE
CLK_COUNT_100HZ <= X"00000";
CLK_100HZ <= NOT CLK_100HZ;
END IF;
END IF;
END PROCESS;
PROCESS (CLK_400HZ, reset)
BEGIN
IF reset = '0'OR D1='1'OR K='1' THEN
state <= RESET1;
DATA_BUS_VALUE <= X"38";
next_command <= RESET2;
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
ELSIF CLK_400HZ'EVENT AND CLK_400HZ = '1' THEN
-- 產生1秒時鐘信號
IF CLK_COUNT_2HZ < 99 THEN
CLK_COUNT_2HZ <= CLK_COUNT_2HZ + 1;
ELSE
CLK_COUNT_2HZ <= X"00";
CLK_2HZ <= NOT CLK_2HZ;
END IF;
-- 發送時間到液晶顯示器
CASE state IS
-- 將8位數據轉換成1602的一個5X8字體大小
WHEN RESET1 =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"38";
state <= TOGGLE_E;
next_command <= RESET2;
WHEN RESET2 =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"38";
state <= TOGGLE_E;
next_command <= RESET3;
WHEN RESET3 =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"38";
state <= TOGGLE_E;
next_command <= FUNC_SET;
-- EXTRA STATES ABOVE ARE NEEDED FOR RELIABLE PUSHBUTTON RESET OF LCD
WHEN FUNC_SET =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"38";
state <= TOGGLE_E;
next_command <= DISPLAY_OFF;
-- Turn off Display and Turn off cursor
WHEN DISPLAY_OFF =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"08";
state <= TOGGLE_E;
next_command <= DISPLAY_CLEAR;
-- Turn on Display and Turn off cursor
WHEN DISPLAY_CLEAR =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"01";
state <= TOGGLE_E;
next_command <= DISPLAY_ON;
-- Turn on Display and Turn off cursor
WHEN DISPLAY_ON =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"0C";
state <= TOGGLE_E;
next_command <= MODE_SET;
-- Set write mode to auto increment address and move cursor to the right
WHEN MODE_SET =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"06";
state <= TOGGLE_E;
next_command <= WRITE_CHAR1;
-- Write ASCII hex character in first LCD character location
WHEN WRITE_CHAR1 =>
LCD_E <= '1';
LCD_RS <= '1';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3" & BCD_SECD1;
state <= TOGGLE_E;
next_command <= WRITE_CHAR2;
-- Write ASCII hex character in second LCD character location
WHEN WRITE_CHAR2 =>
LCD_E <= '1';
LCD_RS <= '1';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3" & BCD_SECD0;
state <= TOGGLE_E;
next_command <= WRITE_CHAR3;
-- Write ASCII hex character in third LCD character location
WHEN WRITE_CHAR3 =>
LCD_E <= '1';
LCD_RS <= '1';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3A" ;
state <= TOGGLE_E;
next_command <= WRITE_CHAR4;
-- Write ASCII hex character in fourth LCD character location
WHEN WRITE_CHAR4 =>
LCD_E <= '1';
LCD_RS <= '1';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3" & BCD_TSEC;
state <= TOGGLE_E;
next_command <= WRITE_CHAR5;
-- Write ASCII hex character in fifth LCD character location
WHEN WRITE_CHAR5 =>
LCD_E <= '1';
LCD_RS <= '1';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3" & BCD_3CAI;
state <= TOGGLE_E;
next_command <= WRITE_CHAR6;
-- Write ASCII hex character in sixth LCD character location
WHEN WRITE_CHAR6 =>
LCD_E <= '0';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3A" ;
state <= TOGGLE_E;
next_command <= WRITE_CHAR7;
-- Write ASCII hex character in seventh LCD character location
WHEN WRITE_CHAR7 =>
LCD_E <= '0';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3" & BCD_SECD1;
state <= TOGGLE_E;
next_command <= WRITE_CHAR8;
-- Write ASCII hex character in eighth LCD character location
WHEN WRITE_CHAR8 =>
LCD_E <= '0';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3" & BCD_SECD0;
state <= TOGGLE_E;
next_command <= WRITE_CHAR9;
WHEN WRITE_CHAR9 =>
LCD_E <= '0';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"2E";
state <= TOGGLE_E;
next_command <= WRITE_CHAR10;
WHEN WRITE_CHAR10 =>
LCD_E <= '0';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"3" & BCD_TSEC;
state <= TOGGLE_E;
next_command <= RETURN_HOME;
-- Return write address to first character postion
WHEN RETURN_HOME =>
LCD_E <= '1';
LCD_RS <= '0';
LCD_RW <= '0';
DATA_BUS_VALUE <= X"80";
state <= TOGGLE_E;
next_command <= WRITE_CHAR1;
-- The next two states occur at the end of each command to the LCD
-- Toggle E line - falling edge loads inst/data to LCD controller
WHEN TOGGLE_E =>
LCD_E <= '0';
state <= HOLD;
-- Hold LCD inst/data valid after falling edge of E line
WHEN HOLD =>
state <= next_command;
END CASE;
END IF;
END PROCESS;
PROCESS (Clk_100hz, reset)
BEGIN
IF reset = '0' OR D1='1'THEN
BCD_HRD1 <= X"0";
BCD_HRD0 <= X"0";
BCD_MIND1 <= X"0";
BCD_MIND0 <= X"0";
BCD_SECD1 <= X"0";
BCD_SECD0 <= X"0";
BCD_TSEC <= X"0";
BCD_3CAI<=X"0";
SEC_LED<='0';
RESET_LED<='0';
Q_LED<='0';
IF K='0' THEN B2<=X"00";ELSE NULL;END IF;
ELSIF clk_100HZ'EVENT AND clk_100HZ = '1' THEN
IF COUNT1<20 THEN
COUNT1<=COUNT1+1;ELSE COUNT1<=0;
IF COUNT2<=8 THEN IF D3='0' THEN COUNT2<=COUNT2+1;ELSE
COUNT2<=COUNT2; END IF;ELSE COUNT2<=1;END IF;END IF ;
IF BCD_3CAI<9 THEN
BCD_3CAI<=BCD_3CAI+1;
IF K='0' THEN B2<=B2+1;
ELSE NULL;
IF D3='0' THEN SEC_LED<='0';
RESET_LED<='0';Q_LED<='0';ELSE
IF K='1'AND D0='1' THEN
IF B2<=15 THEN SEC_LED<='1';
ELSE SEC_LED<='0';
IF B2>15 AND B2<=23 THEN RESET_LED<='1';
ELSE RESET_LED<='0';
IF B2>23 AND B2<=31 THEN Q_LED<='1';
ELSE Q_LED<='0';
IF B2>31 THEN
SEC_LED<='1';
RESET_LED<='1';Q_LED<='1';
ELSE SEC_LED<='0';
RESET_LED<='0';Q_LED<='0';
END IF;END IF;END IF;END IF;END IF;
END IF;END IF;
ELSE
BCD_3CAI<=X"0";
-- TENTHS OF SECONDS
IF BCD_TSEC < 9 THEN
BCD_TSEC <= BCD_TSEC + 1;
ELSE
BCD_TSEC <= X"0";
-- SECONDS
IF BCD_SECD0 < 9 THEN
BCD_SECD0 <= BCD_SECD0 + 1;
ELSE
-- TENS OF SECONDS
BCD_SECD0 <= "0000";
IF BCD_SECD1 < 5 THEN
BCD_SECD1 <= BCD_SECD1 + 1;
ELSE
-- MINUTES
BCD_SECD1 <= "0000";
IF BCD_MIND0 < 9 THEN
BCD_MIND0 <= BCD_MIND0 + 1;
ELSE
-- TENS OF MINUTES
BCD_MIND0 <= "0000";
IF BCD_MIND1 < 5 THEN
BCD_MIND1 <= BCD_MIND1 + 1;
ELSE
-- HOURS
BCD_MIND1 <= "0000";
IF BCD_HRD0 < 9 AND NOT((BCD_HRD1 = 2) AND (BCD_HRD0 = 3))THEN
BCD_HRD0 <= BCD_HRD0 + 1;
ELSE
-- TENS OF HOURS
IF NOT((BCD_HRD1 = 2) AND (BCD_HRD0 = 3)) THEN
BCD_HRD1 <= BCD_HRD1 + 1;
BCD_HRD0 <= "0000";
ELSE
-- NEW DAY
BCD_HRD1 <= "0000";
BCD_HRD0 <= "0000";
END IF;
END IF;
END IF;
END IF;
END IF;
END IF;
END IF;
END IF;
END IF;
END PROCESS;
PROCESS(CLK_100HZ)
BEGIN
CASE SW3 IS
WHEN "0000"=>S1<=X"0";
WHEN "0001"=>S1<=X"1";
WHEN "0010"=>S1<=X"2";
WHEN "0011"=>S1<=X"3";
WHEN "0100"=>S1<=X"4";
WHEN "0101"=>S1<=X"5";
WHEN "0110"=>S1<=X"6";
WHEN "0111"=>S1<=X"7";
WHEN "1000"=>S1<=X"8";
WHEN "1001"=>S1<=X"9";
WHEN "1010"=>S1<=X"A";
WHEN "1011"=>S1<=X"B";
WHEN "1100"=>S1<=X"C";
WHEN "1101"=>S1<=X"D";
WHEN "1110"=>S1<=X"E";
WHEN OTHERS=>S1<=X"F";
END CASE;
IF reset='0'OR D1='1' THEN
B1<=X"00";B3<=X"00";D1<='0';
ELSIF clk_100HZ'EVENT AND clk_100HZ = '1' THEN
IF B1<99 THEN B1<=B1+1;
ELSE B1<=X"00";
IF B3<16 THEN B3<=B3+1;
IF B3=S1 THEN D0<='1';D1<='1';ELSE D0<='0';END IF;
ELSE B3<=X"00";
END IF;END IF;END IF;
END PROCESS;
PROCESS(CLK_100HZ)
BEGIN
IF reset='0' THEN COUNT<=0;Q<='0';
ELSIF D0='1' OR D4='0' THEN
IF CLK_400HZ'EVENT AND CLK_400HZ='1' THEN
IF COUNT<=COUNT2 THEN Q<='1';COUNT<=COUNT+1;
ELSIF COUNT=8 THEN Q<='0';COUNT<=0;
ELSE Q<='0';COUNT<=COUNT+1;
END IF;END IF;ELSE NULL;END IF;END PROCESS;
END a;

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