Keypad 4*4 FPGA

การทดลองที่ 5

Keypad 4*4  FPGA 

อุปกรณ์

1. บอร์ด Altena Cyclone III                                                                                                        1 บอร์ด

2. สายดาวน์โหลด ByteBlaster II Cable หรือ สายดาวน์โหลดUSB Blaster Cable                                1 ชุด

3. เครื่องคอมพิวเตอร์(Quatus II web edition)                                                                           

4. ออสซิลโลสโคป                                                                                                                      1 เครื่อง

5. Keypad 4*4                                                                                                                                      1 ชุด

โจทย์

 สร้างวงจรดิจิทัลเพื่ออ่านค่าจาก 4x4 keypad แล้วแสดงผลด้วย LEDs 

Source Code VHDL

โค๊ด  com_fsm_keypad 

library ieee; library work; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.numeric_std.all; entity com_fsm_keypad is generic( keyNumber : integer := 16; keyLoop : integer := 4; keyPressed : integer := 16 ); port( CLK ,input_reset,input_loop_change : in std_logic; input_detect : in std_logic_vector (keyLoop-1 downto 0); input_loop_out : out std_logic_vector(keyLoop-1 downto 0); -- data_out : out std_logic_vector (keyPressed-1 downto 0):=x"0000"; data_bin : out std_logic_vector (keyLoop-1 downto 0):=x"0" ); end com_fsm_keypad; architecture FSM of com_fsm_keypad is type key_loop is array (0 to keyLoop-1) of std_logic_vector(keyLoop-1 downto 0); constant row_loop : key_Loop :=( 0 => b"0111" , 1 => b"1011", 2 => b"1101" , 3 => b"1110"); type key_pressed is array (0 to keyPressed-1) of std_logic_vector(keyLoop-1 downto 0); constant data_out_t : key_pressed :=( 0 => b"0000" , 1 => b"0001" , 2 => b"0010" , 3 => b"0011" , 4 => b"0100" , 5 => b"0101" , 6 => b"0110" , 7 => b"0111" , 8 => b"1000" , 9 => b"1001" , 10=> b"1010" , 11=> b"1011" , 12=> b"1100" , 13=> b"1101" , 14=> b"1110" , 15=> b"1111" ); -- type key_detected is array (0 to keyPressed-1) of std_logic_vector(keyPressed-1 downto 0); -- constant key_detected_t : key_detected :=( -- 0 => b"0000" , -- 1 => b"0001" , 2 => b"0010" , 3 => b"0100" ,4 => b"1000" , -- 5 => b"0011" , 6 => b"0101" , 7 => b"0110" ,8=> b"1010" , 9 => b"1001" , 10=> b"1100" , -- 11 => b"0111" , 12=> b"1011" , 13=> b"1101" ,14=> b"1110" , -- 15=> b"1111" ); type state_type is (S0,S1,S2,S3); signal state : state_type :=S0; signal row_loop_t: std_logic_vector(keyLoop-1 downto 0):=row_loop(0); signal data_t : std_logic_vector(keyPressed-1 downto 0):= x"0000"; signal delay : integer := 0; signal data_bin_t:std_logic_vector (keyLoop-1 downto 0):=x"0"; signal pressed,state_pressed,loop_changed: std_logic :='1'; begin process (CLK, input_detect,input_reset) begin if input_reset = '0' then state <= S0; delay <=0; row_loop_t <= b"0111"; elsif rising_edge(CLK) then case state is when S0 => row_loop_t <= row_loop(0); loop_changed <='0'; if delay > 100000 then delay <= 0; pressed <= '0'; loop_changed <='1'; state <= S1; else delay <= delay + 1; end if; if loop_changed = '0' then if input_detect(3) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(0); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(2) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(1); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(1) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(2); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(0) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(3); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; end if; when S1 => row_loop_t <= row_loop(1); loop_changed <='0'; if delay > 100000 then delay <= 0; pressed <= '0'; loop_changed <='1'; state <= S2; else delay <= delay + 1; end if; if loop_changed = '0' then if input_detect(3) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(4); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(2) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(5); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(1) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(6); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(0) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(7); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; end if; when S2 => row_loop_t <= row_loop(2); loop_changed <='0'; if delay > 100000 then delay <= 0; pressed <= '0'; loop_changed <='1'; state <= S3; else delay <= delay + 1; end if; if loop_changed = '0' then if input_detect(3) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(8); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(2) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(9); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(1) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(10); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(0) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(11); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; end if; when S3 => row_loop_t <= row_loop(3); loop_changed <='0'; if delay > 100000 then delay <= 0; pressed <= '0'; loop_changed <='1'; state <= S0; else delay <= delay + 1; end if; if loop_changed = '0' then if input_detect(3) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(12); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(2) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(13); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(1) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(14); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; if input_detect(0) = '0' and state_pressed = '0' then --data_t(0) <= '1'; state_pressed <= '1'; data_bin_t <= data_out_t(15); else state_pressed <= '0'; data_t(0) <= '0'; -- data_bin_t <= data_out_t(0); end if; end if; end case; if(input_loop_change ='0')then if delay > 100000 then delay <= 0; pressed <= '0'; else delay <= delay + 1; end if; end if; end if; end process; input_loop_out <= row_loop_t; -- data_out <= data_t; data_bin <= data_bin_t; end FSM;

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