up3_clock.vhd

用VHDL语言编写的一个闹钟程序

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,SET_TIME,SET_CHANGE,SET_ADD,CLOSE_ALARM,SET_MOD,SET_ALARM,GIVE_TIME,ALARM : IN	STD_LOGIC;
		 LCD_RS, LCD_E, RESET_LED, SEC_LED,ALARM_LED,GIVE_TIME_LED		: OUT	STD_LOGIC;
		 LCD_RW						: BUFFER STD_LOGIC;
		 DATA_BUS				: INOUT	STD_LOGIC_VECTOR(7 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, 
	-----
	WRITE_CHAR11,WRITE_CHAR12,WRITE_CHAR13,WRITE_CHAR14,WRITE_CHAR15,WRITE_CHAR16,WRITE_CHAR17,WRITE_CHAR18,
	-----
	RETURN_HOME, GOTO_NEXTLINE,TOGGLE_E, RESET1, RESET2, 
	RESET3, DISPLAY_OFF, DISPLAY_CLEAR,DISPLAY_SET,WRITE_DISPLAY_CHAR1,
	WRITE_DISPLAY_CHAR2,WRITE_DISPLAY_CHAR3,WRITE_DISPLAY_CHAR4,WRITE_DISPLAY_CHAR5,
	WRITE_DISPLAY_CHAR6,WRITE_DISPLAY_CHAR7,WRITE_DISPLAY_CHAR8,WRITE_DISPLAY_CHAR9,WRITE_DISPLAY_CHAR10);
	TYPE STATE2_TYPE IS (HOLD2,ALARM_HOUR,ALARM_MIN,ALARM_SEC,TOGGLE_E2);
	TYPE STATE1_TYPE IS (HOLD1,WRITE_HOUR,WRITE_MIN,WRITE_SEC,TOGGLE_E1);
	SIGNAL state, next_command: STATE_TYPE;
	SIGNAL state1, next_command1: STATE1_TYPE;
	SIGNAL DATA_BUS_VALUE: STD_LOGIC_VECTOR(7 DOWNTO 0);
	SIGNAL CLK_COUNT_400HZ: STD_LOGIC_VECTOR(19 DOWNTO 0);
	SIGNAL CLK_COUNT_10HZ: 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: STD_LOGIC_VECTOR(3 DOWNTO 0);
	------------------------------
	SIGNAL BCD_YEAR1,BCD_YEAR0,BCD_MONTH1,BCD_MONTH0,BCD_DAY0,BCD_DAY1    : STD_LOGIC_VECTOR(3 DOWNTO 0);
    ----------------------
    SIGNAL BCD_S1,BCD_S0,BCD_M1,BCD_M0,BCD_H0,BCD_H1: STD_LOGIC_VECTOR(3 DOWNTO 0);
	SIGNAL CLK_400HZ, CLK_10HZ,ALARM_LABEL : STD_LOGIC;
	SIGNAL state2, next_command2: STATE2_TYPE;
	SIGNAL TIME : INTEGER;
BEGIN
	RESET_LED <= NOT RESET;
	SEC_LED <= BCD_SECD0(0);
-- BIDIRECTIONAL TRI STATE LCD DATA BUS
	DATA_BUS <= DATA_BUS_VALUE WHEN LCD_RW = '0' ELSE "ZZZZZZZZ";
--MAKE CLK_COUNT_400HZ:60000CLK_400HZ0.1
	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;
		END IF;
	END PROCESS;
	
	
	--CLK_400HZstate <=next_command
	PROCESS (CLK_400HZ, reset)
	BEGIN
		IF reset = '0' THEN
			state <= RESET1;
			DATA_BUS_VALUE <= X"38";
			next_command <= RESET2;
			LCD_E <= '1';
			LCD_RS <= '0';
			LCD_RW <= '0';
--CLK_400HZ'EVENT
--CLK_COUNT_10HZ < 19
--CLK_10HZ <= NOT CLK_10HZ;
		ELSIF CLK_400HZ'EVENT AND CLK_400HZ = '1' THEN
-- GENERATE 1 SEC CLOCK SIGNAL FOR SECOND COUNT PROCESS
			IF CLK_COUNT_10HZ < 19 THEN
				CLK_COUNT_10HZ <= CLK_COUNT_10HZ + 1;
			ELSE
				CLK_COUNT_10HZ <= X"00";
				CLK_10HZ <= NOT CLK_10HZ;
			END IF;
-- SEND TIME TO LCD			
			CASE state IS
-- Set Function to 8-bit transfer and 2 line display with 5x8 Font size
-- see Hitachi HD44780 family data sheet for LCD command and timing details
				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 <= DISPLAY_SET;
-- Write ASCII hex character in first LCD character location
                WHEN DISPLAY_SET =>
					   IF ALARM = '0' OR (SET_TIME = '0' AND SET_MOD = '1') THEN
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR1;
					   ELSE
					    state <= TOGGLE_E;
					    next_command <= WRITE_CHAR1;
					   END IF;										
				        
---ALARM
                WHEN WRITE_DISPLAY_CHAR1 =>						
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_H1;
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR2;
-- Write ASCII hex character in second LCD character location
				WHEN WRITE_DISPLAY_CHAR2 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_H0;
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR3;
-- Write ASCII hex character in third LCD character location
				WHEN WRITE_DISPLAY_CHAR3 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3A" ;
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR4;
-- Write ASCII hex character in fourth LCD character location
				WHEN WRITE_DISPLAY_CHAR4 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_M1;
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR5;
-- Write ASCII hex character in fifth LCD character location
				WHEN WRITE_DISPLAY_CHAR5 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_M0;
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR6;
-- Write ASCII hex character in sixth LCD character location
				WHEN WRITE_DISPLAY_CHAR6 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3A" ;
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR7;
-- Write ASCII hex character in seventh LCD character location
				WHEN WRITE_DISPLAY_CHAR7 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_S1;
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR8;
-- Write ASCII hex character in eighth LCD character location
				WHEN WRITE_DISPLAY_CHAR8 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_S0;
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR9;
				WHEN WRITE_DISPLAY_CHAR9 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"2E";
						state <= TOGGLE_E;
						next_command <= WRITE_DISPLAY_CHAR10;
				WHEN WRITE_DISPLAY_CHAR10 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"30";
						state <= TOGGLE_E;
						next_command <= RETURN_HOME;

----ALARM_END
					
				
				WHEN WRITE_CHAR1 =>						
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_HRD1;
						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_HRD0;
						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_MIND1;
						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_MIND0;
						state <= TOGGLE_E;
						next_command <= WRITE_CHAR6;
-- Write ASCII hex character in sixth LCD character location
				WHEN WRITE_CHAR6 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						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 <= '1';
						LCD_RS <= '1';
						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 <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_SECD0;
						state <= TOGGLE_E;
						next_command <= WRITE_CHAR9;
				WHEN WRITE_CHAR9 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"2E";
						state <= TOGGLE_E;
						next_command <= WRITE_CHAR10;
				WHEN WRITE_CHAR10 =>
						LCD_E <= '1';
						LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_TSEC;
						state <= TOGGLE_E;
						next_command <= GOTO_NEXTLINE;
---------------
						
				WHEN WRITE_CHAR11 =>
						LCD_E <='1';
                                         LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_YEAR1;
						state<= TOGGLE_E;
						next_command <= WRITE_CHAR12;

				WHEN WRITE_CHAR12 =>
						LCD_E <='1';
                                         LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_YEAR0;
						state<= TOGGLE_E;
						next_command <= WRITE_CHAR13;
				WHEN WRITE_CHAR13 =>
						LCD_E <='1';
                                         LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"2D";  		--显示"-"
						state<= TOGGLE_E;			
						next_command <= WRITE_CHAR14;


				WHEN WRITE_CHAR14 =>
						LCD_E <='1';
                                         LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_MONTH1;
						state<= TOGGLE_E;
						next_command <= WRITE_CHAR15;

				WHEN WRITE_CHAR15 =>
						LCD_E <='1';
                                         LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"3" & BCD_MONTH0;
						state<= TOGGLE_E;
						next_command <= WRITE_CHAR16;

				WHEN WRITE_CHAR16 =>
						LCD_E <='1';
                                         LCD_RS <= '1';
						LCD_RW <= '0';
						DATA_BUS_VALUE <= X"2D";  		--显示"-"
						state<= TOGGLE_E;			
						next_command <= WRITE_CHAR17;