專題九：紅綠交通燈控制系統(tǒng)課件

專題九：紅綠交通燈控制系統(tǒng)(一）時鐘發(fā)生電路（CLK_GEN）1KHzRESETCLK_1HzFLSH_1Hz（二）紅綠黃燈秒計數(shù)選擇控制電路（traffic_mux）8LOADRESETCLK_1HzRECOUNTSIGN_STATE[1..0]traffic_muxSING_STATE:

00綠燈20秒（橫向路口）

01黃燈5秒（橫向路口）

10綠燈20秒（直向路口）

11黃燈5秒（直向路口）RECOUNT:重新計數(shù)信號。＝‘１’，發(fā)送倒計時時間數(shù)據(jù)；＝‘０’，正常倒計時；LIBRARYIEEE;USEIEEE.std_logic_1164.all;USEIEEE.std_logic_unsigned.all;USEIEEE.std_logic_arith.all;entitytraffic_muxisport(reset,clk_1Hz,recount:instd_logic;sign_state:instd_logic_vector(1downto0);load:outintegerrange255downto0);end;（三）倒計時控制電路（count_down）Clk_1Hzresetrecountload倒計時初值cnt_ff倒計時輸出Next_state計時完畢，輸出一個脈沖信號，控制電路進(jìn)入下一個計時狀態(tài)。count_down倒計時存儲器、計數(shù)器倒計時初值裝入控制信號譯碼器SEG7[15..0]七段顯示器cnt_ff：內(nèi)部存儲器libraryIEEE;useIEEE.std_logic_1164.all;useIEEE.std_logic_arith.all;useIEEE.std_logic_unsigned.all;entitycount_downisport(reset,clk_1Hz:instd_logic;recount:instd_logic;load:inintegerrange255downto0;seg7:outstd_logic_vector(15downto0);next_state:outstd_logic);end;

architectureBEHAVIORofcount_downissignalcnt_ff:integerrange255downto0;beginprocess(clk_1Hz,reset)beginif(reset='1')thencnt_ff<="00000000";seg7<="00000";elsif(clk_1Hz'eventandclk_1Hz='1')thenifrecount='1‘thencnt_ff<=load-1;elsecnt_ff<=cnt_ff-1;endif;endif;

endprocess;（四）紅綠燈信號控制電路（traffic_fsm）recountSing_state0Sing_state1RED0RED1GREEN0GREEN1YELLOW0YELLOW1CLK_1HzRESETFLASH_1HZNEXT_STATEtraffic_fsmLIGHT:紅綠燈狀態(tài)A_MLIGH組合方式：RED1

RED0

YELLOW1

YELOOW0

GREEN1

GREEN0RED0YELOOW0GREEN0RED1YELLOW1GREEN1REDYELLOWGREEN紅綠燈狀態(tài)：STATE狀態(tài)LIGHT狀態(tài)0紅0，綠1R0G1010010狀態(tài)1紅0，黃1R0Y1011000狀態(tài)2綠0，紅1G0R1100001狀態(tài)3黃0，紅1Y0R1100100狀態(tài)4黃0，黃1Y0Y1110000狀態(tài)5黃0，綠1Y0G1110000狀態(tài)6綠0，黃1G0Y1110000狀態(tài)7紅0，紅1R0R1110000LIGH組合方式：RED1

RED0

YELLOW1

YELOOW0

GREEN1

GREEN0LIBRARYIEEE;USEIEEE.std_logic_1164.all;USEIEEE.std_logic_arith.all;USEIEEE.std_logic_unsigned.all;entitytraffic_FSMisport(reset,clk,clk_1Hz,flash_1Hz:instd_logic;a_m:instd_logic;next_state:instd_logic;recount:outstd_logic;sign_state:outstd_logic_vector(1downto0);red:outstd_logic_vector(1downto0);green:outstd_logic_vector(1downto0);yellow:outstd_logic_vector(1downto0));end;whenr0y1=>--nowstate:red0onyellow1flashif(a_m='1'andclk_1Hz='1')thenif(next_state='1')thenrecount<='1';state<=g0r1;sign_state<="10";elserecount<='0';state<=r0y1;endif;wheng0r1=>--nowstate:green0onred1onif(a_m='1'andena_1Hz='1')thenif(next_state='1')thenrecount<='1';state<=y0r1;sign_state<="11";elserecount<='0';state<=g0r1;--red=2'b10;green=2'b01;yellow=2'b00;endif;

wheny0r1=>--nowstate:green0onred1onif(a_m='1'andena_1Hz='1')thenif(next_state='1')thenrecount<='1';state<=r0g1;sign_state<="00";elserecount<='0';state<=y0r1;--red=2'b10;green=2'b00;yellow=2'b01;endif;

whenothers=>state<=r0g1;recount<='0';sign_state<="00";endcase;endif;endif;endprocess;

--light:r(10)y(10)g(10)light<="010010"when(state=r0g1)else"011000"when(state=r0y1)else