EDA專業(yè)課程設(shè)計鍵盤掃描電路設(shè)計

電子課程設(shè)計—鍵盤掃描電路設(shè)計學(xué)院：班級：姓名：學(xué)號：指導(dǎo)老師：12月目錄1.設(shè)計任務(wù)和要求……………12.功效模塊……………………23.選擇器件……………………34.功效模塊……………………55.設(shè)計總體電路圖……………86.心得體會…………………10設(shè)計任務(wù)和要求1、鍵盤按鈕數(shù)為4，系統(tǒng)時鐘10MHz；2、能識別出所按按鈕；3、按鈕被按下后，視為此按鈕輸入一次，若按鈕長時間不松，（時限1S）后每隔0.5S視為再次輸入，直至按鈕松開；4、要求能對按鈕按下時指令抖動能正確處理。對連續(xù)時間小于50ms輸入不作響應(yīng)；5、各鍵設(shè)置不一樣優(yōu)先級，多鍵同時按下時，視為優(yōu)先級較高按鍵被按下；功效模塊圖3模塊delta其VHDL語言以下：libraryieee;useieee.std_logic_1164.all;useieee.std_logic_unsigned.all;useieee.std_logic_unsigned.all;entitykeyboard4_4isport(rst:instd_logic;clk_in:instd_logic;keyin:instd_logic_vector(3downto0);scan:outstd_logic_vector(3downto0);leds:outstd_logic_vector(3downto0); state : outstd_logic; VGA:outstd_logic_vector(3downto0));endkeyboard4_4;architecturekeyboard4_4_archofkeyboard4_4is----********************************************* componentdebouncing port( key :INSTD_LOGIC; clk,clr:INSTD_LOGIC; dly_out:OUTSTD_LOGIC); endcomponent;--*********************************************--signalclkfrq:std_logic;signalcntscn:std_logic_vector(1downto0);signalscnlin:std_logic_vector(3downto0);signalcntfrq:std_logic_vector(14downto0);--signalcntfrq:std_logic_vector(3downto0);signallednum:std_logic_vector(7downto0); signalkey_tmp : std_logic_vector(3downto0); signalclk : std_logic; signalcntfrq1:std_logic_vector(5downto0);begin VGA<="0101"; --鍵盤功效選擇 scan<=notscnlin; lednum<=scnlin&(notkey_tmp);-- key_tmp<=keyin;--debounuingcktdebounuing:blockbegin U1:debouncingPORTMAP( KEY=>keyin(0), DLY_OUT=>key_tmp(0), clr=>rst, clk=>CLK ); U2:debouncingPORTMAP( KEY=>keyin(1), dly_out=>key_tmp(1), clr=>rst, clk=>CLK ); U3:debouncingPORTMAP( key=>keyin(2), dly_out=>key_tmp(2), clr=>rst, clk=>CLK ); U4:debouncingPORTMAP( key=>keyin(3), dly_out=>key_tmp(3), clr=>rst, clk=>CLK );ENDblockdebounuing;----******************************************************--process(rst,clk_in)--晶振為40MHz，進行40000分頻產(chǎn)生去抖時鐘（1000Hz)beginifrst='0'thencntfrq<=(others=>'0');elsifrising_edge(clk_in)thenif(cntfrq="111"ornot(key_tmp="1110"orkey_tmp="1101"orkey_tmp="1011"orkey_tmp="0111"))then--if(cntfrq="111"orkey_tmp="1111")then--ifcntfrq="1111"thencntfrq<=(others=>'0');clk<=notclk;--去抖時鐘elsecntfrq<=cntfrq+1;endif;endif;endprocess; process(rst,clk) --去抖時鐘,50分頻,形成掃描時鐘 begin ifrst='0'then clkfrq<='0'; cntfrq1<=(others=>'0'); elsifrising_edge(clk)then ifcntfrq1="11000"then cntfrq1<=(others=>'0'); clkfrq<=notclkfrq; else cntfrq1<=cntfrq1+1; endif; endif; endprocess;process(rst,clkfrq)--依據(jù)掃描時鐘產(chǎn)生掃描線beginifrst='0'thencntscn<="00";elsifrising_edge(clkfrq)thenifcntscn="11"thencntscn<="00";elsecntscn<=cntscn+1;endif;casecntscniswhen"00"=>scnlin<="0001";when"01"=>scnlin<="0010";when"10"=>scnlin<="0100";when"11"=>scnlin<="1000";whenothers=>null;endcase;endif;endprocess;process(rst,clkfrq)--依據(jù)按鍵點亮對應(yīng)ledsbeginif(rst='0')thenleds<=not"1111";elsifclkfrq'eventandclkfrq='0'thencaselednumiswhen"00010001"=>leds<=not"0001"; --1when"00010010"=>leds<=not"0010"; --2when"00010100"=>leds<=not"0011"; --3when"00011000"=> leds<=not"1010"; --Awhen"00100001"=>leds<=not"0100"; --4when"00100010"=> leds<=not"0101"; --5when"00100100"=>leds<=not"0110"; --6 when"00101000"=>leds<=not"1011"; --Bwhen"01000001"=>leds<=not"0111"; --7when"01000010"=>leds<=not"1000"; --8when"01000100"=>leds<=not"1001"; --9when"01001000"=>leds<=not"1100"; --Cwhen"10000001"=>leds<=not"1110"; --*when"10000010"=>leds<=not"0000"; --0when"10000100"=>leds<=not"1111"; --#when"10001000"=>leds<=not"1101"; --D