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            自動售貨機VHDL程序

            時間:2024-10-18 18:22:56 通信工程畢業論文 我要投稿
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            自動售貨機VHDL程序

            (1)自動售貨機VHDL程序如下:
            --文件名:pl_auto1.vhd。
            --功能:貨物信息存儲,進程控制,硬幣處理,余額計算,顯示等功能。
            --說明:顯示的錢數coin的 以5角為單位。
            --最后修改日期:2004.3.23。
            library ieee;
            use ieee.std_logic_arith.all;
            use ieee.std_logic_1164.all;
            use ieee.std_logic_unsigned.all;
            entity PL_auto1 is
            port ( clk:in std_logic;                              --系統時鐘
             set,get,sel,finish: in std_logic;                   --設定、買、選擇、完成信號
             coin0,coin1: in std_logic;                      --5角硬幣、1元硬幣
             price,quantity  :in std_logic_vector(3 downto 0);   --價格、數量數據
             item0 , act:out std_logic_vector(3 downto 0);       --顯示、開關信號
             y0,y1 :out std_logic_vector(6 downto 0);          --錢數、商品數量顯示數據
             act10,act5   :out std_logic);                   --1元硬幣、5角硬幣
            end PL_auto1;
            architecture behav of PL_auto1 is
            type  ram_type is array(3 downto 0)of std_logic_vector(7 downto 0);
            signal ram :ram_type;                                      --定義RAM
            signal item: std_logic_vector(1 downto 0);                      --商品種類
            signal coin: std_logic_vector(3 downto 0);                      --幣數計數器
            signal pri,qua:std_logic_vector(3 downto 0);                    --商品單價、數量
            signal clk1: std_logic;                                      --控制系統的時鐘信號
            begin
            com:process(set,clk1)
            variable quan:std_logic_vector(3 downto 0);
            begin
              if set='1' then ram(conv_integer(item))<=price & quantity;act<="0000";
             --把商品的單價、數量置入到RAM
              elsif clk1'event and clk1='1' then  act5<='0'; act10<='0';
                  if coin0='1' then    
                  if coin<"1001"then coin<=coin+1;            --投入5角硬幣,coin自加1
               else coin<="0000";
               end if;
                  elsif coin1='1' then
               if coin<"1001"then coin<=coin+2;            --投入1元硬幣,coin自加2
               else coin<="0000";
               end if;
                  elsif sel='1' then item<=item+1;                  --對商品進行循環選擇
             elsif get='1' then                              --對商品進行購買
             if qua>"0000" and coin>=pri then coin<=coin-pri;quan:=quan-1;
             ram(conv_integer(item))<=pri & quan;
                        if   item="00" then act<="1000";  --購買時,自動售貨機對4種商品的操作
               elsif item="01" then act<="0100";
                  elsif item="10" then act<="0010";
                  elsif item="11" then act<="0001";
               end if;
              end if;
                  elsif  finish='1' then                            --結束交易,退幣(找幣)
                     if coin>"0001" then act10<='1';coin<=coin-2;     --此IF語句完成找幣操作
                     elsif coin>"0000" then act5<='1'; coin<=coin-1;
                     else act5<='0'; act10<='0';
                     end if;
                  elsif get='0' then act<="0000";                 
                     for i in 4 to 7 loop                   
                     pri(i-4)<=ram (conv_integer(item))(i);           --商品單價的讀取
                     end loop;
                     for i in 0 to 3 loop
                     quan(i):=ram(conv_integer(item))(i);            --商品數量的讀取
                     end loop;
                  end if;
              end if;
             qua<=quan;
            end process com;

            m32:process(clk)                            --此進程完成對32Mhz的脈沖分頻
            variable q: std_logic_vector( 24 downto 0);
            begin
               if clk'event and clk='1' then q:=q+1;
               end if;
               if q="111111111111111111111111" then clk1<='1';
               else clk1<='0';
               end if;
            end process m32;

            code0:process(item)                          --商品指示燈譯碼
            begin
             case item is
             when "00"=>item0<="0111";
             when "01"=>item0<="1011";
             when "10"=>item0<="1101";
             when others=>item0<="1110";
             end case;
            end process;

            code1: process (coin)                       --錢數的BCD到七段碼的譯碼
            begin
              case coin is
                  when "0000"=>y0<="0000001";
                  when "0001"=>y0<="1001111";
                  when "0010"=>y0<="0010010";
                  when "0011"=>y0<="0000110";
                  when "0100"=>y0<="1001100";
                  when "0101"=>y0<="0100100";
                  when "0110"=>y0<="0100000";
                  when "0111"=>y0<="0001111";
                  when "1000"=>y0<="0000000";
                  when "1001"=>y0<="0000100";
                  when others=>y0<="1111111";
              end case;
            end process;

            code2: process (qua)                       --單價的BCD到七段碼的譯碼
            begin
              case qua is
                  when "0000"=>y1<="0000001";
                  when "0001"=>y1<="1001111";
                  when "0010"=>y1<="0010010";
                  when "0011"=>y1<="0000110";
                  when "0100"=>y1<="1001100";
                  when "0101"=>y1<="0100100";
                  when "0110"=>y1<="0100000";
                  when "0111"=>y1<="0001111";
                  when "1000"=>y1<="0000000";
                  when "1001"=>y1<="0000100";
                  when others=>y1<="1111111";
              end case;
            end process;
            end behav;

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