专题九红绿交通灯控制系统.pptx

专题九：红绿交通灯控制系统专题九：红绿交通灯控制系统(一）时钟发生电路（一）时钟发生电路（CLK_GEN）1KHzRESETCLK_1HzFLSH_1Hz（二）红绿黄灯秒计数选择控制电路（二）红绿黄灯秒计数选择控制电路（traffic_mux）8LOADRESETCLK_1HzRECOUNTSIGN_STATE1.0traffic_muxSING_STATE:00 绿灯绿灯20秒（横向路口）秒（横向路口）01 黄灯黄灯5秒（横向路口）秒（横向路口）10 绿灯绿灯20秒（直向路口）秒（直向路口）11 黄灯黄灯5秒（直向路口）秒（直向路口）RECOUNT:重新计数信号。重新计数信号。，发送倒计时时间数据；，发送倒计时时间数据；，正常倒计时；，正常倒计时；LIBRARY IEEE;USE IEEE.std_logic_1164.all;USE IEEE.std_logic_unsigned.all;USE IEEE.std_logic_arith.all;entity traffic_mux is port(reset,clk_1Hz,recount:in std_logic;sign_state:in std_logic_vector(1 downto 0);load:out integer range 255 downto 0);end;begin process(reset,clk_1s)begin if reset=1 then load load load load load null;END CASE;end if;end if;end process;end BEHAVIOR;（三）倒计时控制电路（三）倒计时控制电路（count_down）Clk_1Hzresetrecountload倒计时初值倒计时初值cnt_ff倒计时输出倒计时输出Next_state计时完毕，输出一个脉计时完毕，输出一个脉冲信号，控制电路进入冲信号，控制电路进入下一个计时状态。下一个计时状态。count_down倒倒计计时时存存储储器器、计计数数器器倒计时初值装倒计时初值装入控制信号入控制信号译码器译码器SEG715.0七段显示器七段显示器cnt_ff：内部存储器：内部存储器library IEEE;use IEEE.std_logic_1164.all;use IEEE.std_logic_arith.all;use IEEE.std_logic_unsigned.all;entity count_down is port(reset,clk_1Hz:in std_logic;recount:in std_logic;load:in integer range 255 downto 0;seg7:out std_logic_vector(15 downto 0);next_state:out std_logic);end;architecture BEHAVIOR of count_down is signal cnt_ff:integer range 255 downto 0;begin process(clk_1Hz,reset)begin if(reset=1)then cnt_ff=00000000;seg7=0000000000000000;elsif(clk_1Hzevent and clk_1Hz=1)then if recount=1 then cnt_ff=load-1;else cnt_ffseg7seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7 seg7=0011111100111111;end case;end process;next_state=1 when cnt_ff=1 else 0;end BEHAVIOR;（四）红绿灯信号控制电路（四）红绿灯信号控制电路（traffic_fsm）recountSing_state0Sing_state1RED0RED1GREEN0GREEN1YELLOW0YELLOW1CLK_1HzRESETFLASH_1HZNEXT_STATEtraffic_fsmLIGHT:红绿灯红绿灯状态状态A_MLIGH组合方式：组合方式：RED1RED0 YELLOW1 YELOOW0 GREEN1 GREEN0RED0 YELOOW0 GREEN0RED1 YELLOW1 GREEN1REDYELLOWGREEN红绿灯状态：红绿灯状态：STATE状态状态LIGHT状态状态0红红0，绿，绿1R0G1010010状态状态1红红0，黄，黄1R0Y1011000状态状态2绿绿0，红，红1G0R1100001状态状态3黄黄0，红，红1Y0R1100100状态状态4黄黄0，黄，黄1Y0Y1110000状态状态5黄黄0，绿，绿1Y0G1110000状态状态6绿绿0，黄，黄1G0Y1110000状态状态7红红0，红，红1R0R1110000LIGH组合方式：组合方式：RED1RED0 YELLOW1 YELOOW0 GREEN1 GREEN0LIBRARY IEEE;USE IEEE.std_logic_1164.all;USE IEEE.std_logic_arith.all;USE IEEE.std_logic_unsigned.all;entity traffic_FSM is port(reset,clk,clk_1Hz,flash_1Hz:in std_logic;a_m:in std_logic;next_state:in std_logic;recount:out std_logic;sign_state:out std_logic_vector(1 downto 0);red:out std_logic_vector(1 downto 0);green:out std_logic_vector(1 downto 0);yellow:out std_logic_vector(1 downto 0);end;architecture BEHAVIOR of traffic_FSM is type Sreg0_type is(r0g1,r0y1,g0r1,y0r1,y0y1,y0g1,g0y1,r0r1);signal state:Sreg0_type;signal light:std_logic_vector(5 downto 0);begin if(reset=1)then state=r0g1;-设定当前为横向红灯亮，竖向绿灯亮设定当前为横向红灯亮，竖向绿灯亮 sign_state=“01”;-选择选择20秒倒计时秒倒计时 recount if(a_m=1 and clk_1Hz=1)then if(next_state=1)then-当前计数完毕，转入下一种计时当前计数完毕，转入下一种计时 recount=1;state=r0y1;sign_state=01;else recount=0;state -now state:red0 on yellow1 flash if(a_m=1 and clk_1Hz=1)then if(next_state=1)then recount=1;state=g0r1;sign_state=10;else recount=0;state -now state:green0 on red1 on if(a_m=1 and ena_1Hz=1)then if(next_state=1)then recount=1;state=y0r1;sign_state=11;else recount=0;state -now state:green0 on red1 on if(a_m=1 and ena_1Hz=1)then if(next_state=1)then recount=1;state=r0g1;sign_state=00;else recount=0;state state=r0g1;recount=0;sign_state=00;end case;end if;end if;end process;-light:r(10)y(10)g(10)light=010010 when(state=r0g1)else 011000 when(state=r0y1)else 100001 when(state=g0r1)else 100100 when(state=y0r1)else 110000;red=light(5 downto 4);yellow=light(3 downto 2)and(flash_1Hz&flash_1Hz);green=light(1 downto 0);end BEHAVIOR;