library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_unsigned.all;

entity table is
	port(reset:in std_logic;					--重置
		 clk_5:in std_logic;					--5Hz
		 music_begin:in std_logic;				--音樂開始
		 count:out integer range 0 to 1300);	--發生控制	
end table;

architecture body_table of table is
--音符常量
	constant mid_1:integer:=954;constant mid_2:integer:=850;
	constant mid_3:integer:=757;constant mid_6:integer:=568;
	constant mid_5:integer:=638;constant mid_4:integer:=715;
	constant stop: integer:=0;
	--constant mid_6:integer:=568;
	--constant low_6:integer:=1100;constant low_5:integer:=1210;
	

	signal counter: integer range 32 downto 0;

	begin
		process(clk_5,music_begin,counter)
		begin
			if(reset='1') then counter<=0;
			elsif(clk_5'event and clk_5='1') then
				if(music_begin='1') then
				counter<=counter+1;				
				else counter<=0;
				end if;
			end if;
		end process;

		process(counter)
		begin
			case counter is
		--樂譜
				when 00=>count<=stop;
				when 01=>count<=mid_3;when 02=>count<=mid_3;
				when 03=>count<=mid_4;when 04=>count<=mid_5;
				when 05=>count<=mid_5;when 06=>count<=mid_4;
				when 07=>count<=mid_3;when 08=>count<=mid_2;
				when 09=>count<=mid_1;when 10=>count<=mid_1;
				when 11=>count<=mid_2;when 12=>count<=mid_3;
				when 13=>count<=mid_3;when 14=>count<=mid_2;
				when 15=>count<=mid_2;when 16=>count<=stop;
				when 17=>count<=mid_3;when 18=>count<=mid_3;
				when 19=>count<=mid_4;when 20=>count<=mid_5;
				when 21=>count<=mid_5;when 22=>count<=mid_4;
				when 23=>count<=mid_3;when 24=>count<=mid_2;
				when 25=>count<=mid_1;when 26=>count<=mid_1;
				when 27=>count<=mid_2;when 28=>count<=mid_3;
				when 29=>count<=mid_2;when 30=>count<=mid_1;
				when 31=>count<=mid_1;when 32=>count<=stop;
			end case;
		end process;
	end body_table;