自动售货机代码vhdl
时间: 2023-12-20 11:30:09 浏览: 48
以下是一个简单的自动售货机代码的VHDL实现,其中包括了货物的选择、投币、找零等功能。具体实现细节可以根据实际需求进行修改。
```vhdl
entity vending_machine is
Port ( clk : in STD_LOGIC;
reset : in STD_LOGIC;
coin : in STD_LOGIC_VECTOR (1 downto 0);
selection : in STD_LOGIC_VECTOR (1 downto 0);
dispense : out STD_LOGIC_VECTOR (1 downto 0);
change : out STD_LOGIC_VECTOR (1 downto 0));
end vending_machine;
architecture Behavioral of vending_machine is
type state_type is (idle, select, coin_inserted, dispense_item, dispense_change);
signal current_state, next_state : state_type;
signal item_price : STD_LOGIC_VECTOR (1 downto 0);
signal coin_total : STD_LOGIC_VECTOR (1 downto 0);
signal coin_inserted : STD_LOGIC_VECTOR (1 downto 0);
signal change_total : STD_LOGIC_VECTOR (1 downto 0);
begin
process (clk, reset)
begin
if reset = '1' then
current_state <= idle;
coin_total <= "00";
change_total <= "00";
coin_inserted <= "00";
dispense <= "00";
change <= "00";
elsif rising_edge(clk) then
current_state <= next_state;
end if;
end process;
process (current_state, coin, selection)
begin
case current_state is
when idle =>
if selection /= "00" then
item_price <= selection;
next_state <= select;
else
next_state <= idle;
end if;
when select =>
if coin /= "00" then
coin_inserted <= coin;
coin_total <= coin_total + coin_inserted;
next_state <= coin_inserted;
else
next_state <= select;
end if;
when coin_inserted =>
if coin_total >= item_price then
change_total <= coin_total - item_price;
next_state <= dispense_item;
else
next_state <= coin_inserted;
end if; when dispense_item =>
dispense <= item_price;
if change_total /= "00" then
next_state <= dispense_change;
else
next_state <= idle;
end if;
when dispense_change =>
change <= change_total;
next_state <= idle;
end case;
end process;
end Behavioral;
```