紅綠燈控制電路VHDL20240608_RYG
完成一個十字路口紅綠燈控制電路
https://youtube.com/shorts/F2PGvyhlvCQ
有RYG1與RYG2共兩組紅綠燈，紅綠燈的週期是10秒，綠燈4秒，黃燈1秒，紅燈5秒。
電源打開時起始狀態是RYG1亮綠燈，RGY2亮紅燈
設rst鈕，按下回到RYG1亮綠燈，RGY2亮紅燈繼續
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;
use ieee.numeric_std.all;
entity VHDL20240608_RYG is
port(
clk_4M:in std_logic;
rst:in std_logic;
RYG:out std_logic_vector(7 downto 0));
end VHDL20240608_RYG;
architecture aa of VHDL20240608_RYG is
signal cnt1:integer range 0 to 1999999:=0;
signal clk_sec:std_logic:='0';
signal cnt2:integer range 0 to 9:=0;
begin
process(clk_4M)
begin
if rising_edge(clk_4M) then
if cnt1=1999999 then
cnt1<=0;
clk_sec<=not clk_sec;
else
cnt1<=cnt1+1;
end if;
end if;
end process;
process(clk_sec)
begin
if rst='0' then
cnt2<=0;
elsif rising_edge(clk_sec) then
if cnt2=9 then
cnt2<=0;
else
cnt2<=cnt2+1;
end if;
end if;
end process;
RYG<= "00010100" when cnt2=0 else
"00010100" when cnt2=1 else
"00010100" when cnt2=2 else
"00010100" when cnt2=3 else
"00100100" when cnt2=4 else
"01000001" when cnt2=5 else
"01000001" when cnt2=6 else
"01000001" when cnt2=7 else
"01000001" when cnt2=8 else
"01000010" when cnt2=9 else
"00000000";
end aa;
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