基于FPGA的温度显示系统剖析

1、生产实习报告基于FPGA的温度显示系统现代电子系统质量提高工程报告专业：电子科学与技术班级：电子12-1姓名：学号：1206040124一、生广实习任务极其完成情况1 .设计任务设计了一种基于FPGAf口LM75刖勺温度测量系统。硬件设计上，系统以EP4CE6E22C8N为主控芯片，采用数字温度传感器LM75A检测环境温度，并利用LM75A自带的IIC总线接口传输数据，通过数码管将温度实时显示出来；软件设计上，采用自顶向下模块化设计思想，先设计出IIC通信模块、温度显示模块，然后再编写顶层模块，将2个模块整合。2 .电路图aCt3 .程序流程图开始（结束4 .编与的程序（一）功能模块：libr

2、aryieee;useieee.std_logic_1164.all;useieee.std_logic_unsigned.all;useieee.std_logic_arith.all;-实体-entityat24c08isport(clkinstd_logic;rst:instd_logic;scloutstd_logic;sdainoutstd_logic;urv_1instd_logic;urv_2instd_logic;sel:outstd_logic_vector(3downto0);seg:outstd_logic_vector(7downto0);beepoutstd_logi

3、c-时钟信号-复位信号-i2c时钟线-i2c数据线-上限值1-上限值2蜂鸣器输出信号线)；endat24c08;一结构体-architecturearch_at24c08ofat24c08issignaclk_sslowstd_logic;signacounterstd_logic_vector(23downto0);signareaddata_reg_bufstd_logic_vector(15downto0);signareaddata_tenintegerrange0to24564;signareaddata_stdstd_logic_vector(15downto0);signaqia

4、nstd_logic_vector(3downto0);signabaistd_logic_vector(3downto0);signashistd_logic_vector(3downto0);signagestd_logic_vector(3downto0);signaqian_0integerrange0to10;signabai_0integerrange0to10;signashi_0integerrange0to10;signage_0integerrange0to10;-数码管部分信号signal sel_0signal seg_0signal countsignal clk_s

5、lowsignal scan_numsignal seg_data_buf-i2c部分信号signal sda_bufsignal linksignal readdata_reg存器signal sda_0signal scl_0std_logic_vector(3downto0);std_logic_vector(7downto0);std_logic_vector(13downto0);std_logic;std_logic_vector(1downto0);std_logic_vector(3downto0);std_logic;-i2c输入/输出数据寄存器std_logic;-sda输

6、入输出方向寄存器std_logic_vector(15downto0);-i2c读回的数据寄std_logic;-与sda端口连接信号std_logic;-与scl端口连接信号-按键消抖部分信号signaldelay_cntsignalstart_delaystd_logic_vector(19downto0);std_logic;-消抖延时计数器-按键延时开始-分频部分信号signalclk_div:std_logic_vector(12downto0);-分频计数器，5000分频，10khz-蜂鸣器部分信号signalbeep_en:std_logic;signalbeep_buf:std

7、_logic;-蜂鸣器使能信号-与beep端口连接的信号-时钟部分信号signallevel_highstd_logic;-高电平中间值，1249std_logic_vector(12 downto 0):="1001110001000"signallevel_lowsignallevel_hig_edgesignallevel_low_edge-状态机部分信号signalmain_statesignali2c_statesignali2c_per_state-分频部分常量constantdiv_parameter-分频系数，500-状态机部分常量-操作状态常量consta

8、ntread_init初始化constantread_high数据状态constantread_low数据状态-i2c每一步状态常量constantstart- -开始位constantfirst- -数据第一位constantsecond- -数据第二位constantthirdstd_logic;std_logic;std_logic;std_logic_vector(1downto0);std_logic_vector(2downto0);std_logic_vector(3downto0);std_logic_vector(2downto0)std_logic_vector(2down

9、to0)std_logic_vector(2downto0)std_logic_vector(3downto0)std_logic_vector(3downto0)std_logic_vector(3downto0)std_logic_vector(3downto0)- 低电平中间值，3749- -上升沿，4999- 下降沿，2499-状态机主状态-i2c状态-i2c每一步状态尸"000”;-EEPORM尸"001”;-读高位尸"010”;-读低位尸"0000"尸"0001”；尸"0010"尸"0011&

10、quot;-数据第三位constant fourth-数据第四位constant fifth-数据第五位constant sixth-数据第六位constant seventh-数据第七位constant eighth-数据第八位constant ack-应答位constant stop一停止位std_logic_vector(3downto0)k"0100"std_logic_vector(3downto0)k"0101"std_logic_vector(3downto0)k"0110"std_logic_vector(3downt

11、o0)k"0111"std_logic_vector(3downto0)k"1000"std_logic_vector(3downto0)k"1001"std_logic_vector(3downto0):="1010"-结构体开始beginscl<=scl_0;seg<=seg_0;sda_0<=sda_bufwhen(link)='1'else'Z'sda<=sda_0;sel<=sel_0;beep<=beep_buf;-按键消抖key:pr

12、ocess(clk,rst)beginif(notrst='1')thendelay_cnt<=(others=>'0');elsif(clk'eventandclk='1')thenifstart_delay='1'thenif(delay_cnt/="11110100001001000000")then-20ms延时delay_cnt<=delay_cnt+'1'elsedelay_cnt<=(others=>'0');endif;end

13、if;endif;endprocesskey;-分频部分div:process(rst,clk)beginif(notrst='1')thenclk_div<="0000000000000"level_high<='0'level_low<='0'level_hig_edge<='0'level_low_edge<='0'elsif(clk'eventandclk='1')thenif(clk_div/=div_parameter-'

14、1')thenclk_div<=clk_div+'1'elseclk_div<="0000000000000"endif;if(level_high='1')thenlevel_high<='0'elseif(clk_div="10011100001") thenlevel_high<='1'endif;endif;if(level_low_edge='1')thenlevel_low_edge<='0'elseif(cl

15、k_div="100111000011")thenlevel_low_edge<='1'endif;endif;if(level_low='1')thenlevel_low<='0'elseif(clk_div="111010100101")thenlevel_low<='1'endif;endif;if(level_hig_edge='1')thenlevel_hig_edge<='0'elseif(clk_div="100

16、1110000111")thenlevel_hig_edge<='1'endif;endif;endif;endprocessdiv;-EEPROMft作部分state:process(clk,rst)beginif(notrst='1')thenstart_delay<='0'scl_0<='1'sda_buf<='1'link<='0'readdata_reg<="0000000000000000"main_state<=&

17、quot;00"i2c_state<=read_init;i2c_per_state<=start;elsif(clk'eventandclk='1')thencasemain_stateis-初始化EEPROMwhen"00"=>-等待读写要求scl_0<='1'sda_buf<='1'link<='0'i2c_state<=read_init;i2c_per_state<=start;main_state<="10"

18、-读取EEPR做据when"10"=>if(level_hig_edge='1')thenscl_0<='1'elseif(level_low_edge='1')thenscl_0<='0'endif;endif;casei2cstateiswhenread_init=>-读命令地址casei2c_per_stateiswhenstart=>if(level_high='1')thensda_buf<='0'link<='1

19、9;endif;if(level_lowandlink)='1')thenlink<='1'sda_buf<='1'i2c_per_state<=first;endif;whenfirst=>if(level_low='1')thensda_buf<='0'link<='1'i2c_per_state<=second;endif;whensecond=>if(level_low='1')thensda_buf<='0

20、9;link<='1'i2c_per_state<=third;endif;whenthird=>if(level_low='1')thensda_buf<='1'i2c_per_state<=fourth;endif;whenfourth=>if(level_low='1')thensda_buf<='0'link<='1'i2c_per_state<=fifth;endif;whenfifth=>if(level_low='1&

21、#39;)thensda_buf<='0'link<='1'i2c_per_state<=sixth;endif;whensixth=>if(level_low='1')thensda_buf<='0'link<='1'i2c_per_state<=seventh;endif;whenseventh=>if(level_low='1')thensda_buf<='1'link<='1'i2c_per_stat

22、e<=eighth;endif;wheneighth=>if(level_low='1')thenlink<='0'i2c_per_state <= ack;end if;whenack=>if(level_hig_edge='1')thensda_buf<=sda;endif;if(level_high='1')thenif(sda_buf='1')thenmain_state<="00"endif;endif;if(level_low='1&

23、#39;)thenlink<='0'i2c_state<=read_high;i2c_per_state<=first;endif;whenothers=>null;endcase;whenread_high=>-读回数据casei2c_per_stateiswhenfirst=>if(level_hig_edge='1')thensda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(15downto9)<=readdata_reg(14down

24、to8);readdata_reg(8)<=sda;endif;if(level_low='1')thenwhensecond=>if(level_hig_edge='1')thensda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(14 downto 8);readdata_reg(14 downto 8);readdata_reg(15downto9)二readdata_reg(8) <= sda;end if;if(level_low='1')

25、theni2c_per_state <= third;end if;when third =>if(level_hig_edge='1') thensda_buf <= sda;end if;if(level_high='1') thenreaddata_reg(15 downto 9)<=readdata_reg(8)<=sda;endif;if(level_low='1')theni2c_per_state<=fourth;endif;whenfourth=>if(level_hig_edge=

26、9;1')thensda_buf<=sda;endif;if(level_high='1') thenreaddata_reg(15downto9)<=readdata_reg(14downto8);readdata_reg(8)<=sda;endif;if(level_low='1')theni2c_per_state<=fifth;endif;whenfifth=>if(level_hig_edge='1')thensda_buf<=sda;endif;if(level_high='1

27、9;)thenreaddata_reg(15downto9)<=readdata_reg(14downto8);readdata_reg(8)<=sda;endif;if(level_low='1')theni2c_per_state<=sixth;endif;whensixth=>if(level_hig_edge='1')thensda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(15downto9)<=readdata_reg(14downto8);

28、readdata_reg(8)<=sda;endif;if(level_low='1')theni2c_per_state<=seventh;end if;二二whenseventh=>if(level_hig_edge='1')thensda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(15downto9)readdata_reg(14downto8);readdata_reg(8)<=sda;endif;if(level_low='1')th

29、eni2c_per_state<=eighth;endif;wheneighth=>if(level_hig_edge='1')thensda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(15downto9)readdata_reg(14downto8);readdata_reg(8)<=sda;endif;if(level_low='1')theni2c_per_state<=ack;endif;whenack=>if(level_high='1

30、')thenlink<='1'sda_buf<='0'i2c_per_state<=first;i2c_state <= read_low;endif;whenothers=>null;endcase;whenreadlow=>casei2c_per_stateiswhenfirst=>if(level_hig_edge='1')thenlink<='0'sda_buf<=sda;endif;if(level_high='1')thenreaddata_

31、reg(7downto1)<=readdata_reg(6downto0);readdata_reg(0)<=sda;endif;if(level_low='1')theni2c_per_state<=second;endif;whensecond=>if(level_hig_edge='1')thenlink<='0'sda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(7downto1)<=readdata_reg(6downto0

32、);readdata_reg(0)<=sda;endif;if(level_low='1') theni2c_per_state<=third;endif;whenthird=>if(level_hig_edge='1')thenlink<='0'sda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(7downto1)<=readdata_reg(6downto0);readdata_reg(0)<=sda;endif;if(level

33、_low='1')theni2c_per_state<=fourth;endif;whenfourth=>if(level_hig_edge='1')thenlink<='0'sda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(7downto1)<=readdata_reg(6downto0);readdata_reg(0)<=sda;endif;if(level_low='1')theni2c_per_state<=

34、fifth;endif;whenfifth=>link<='0'sda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(7downto1)<=readdata_reg(6downto0);readdata_reg(0)<=sda;endif;if(level_low='1')theni2c_per_state<=sixth;endif;whensixth=>if(level_hig_edge='1')thenlink<='0

35、'sda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(7downto1)<=readdata_reg(6downto0);readdata_reg(0)<=sda;endif;if(level_low='1')theni2c_per_state<=seventh;endif;whenseventh=>if(level_hig_edge='1')thenlink<='0'sda_buf<=sda;endif;if(level_h

36、igh='1') thenreaddata_reg(7downto1)<=readdata_reg(6downto0);readdata_reg(0)<=sda;endif;if(level_low='1')theni2c_per_state<=eighth;endif;wheneighth=>if(level_hig_edge='1')thenlink<='0'sda_buf<=sda;endif;if(level_high='1')thenreaddata_reg(7down

37、to1)<=readdata_reg(6downto0);readdata_reg(0)<=sda;endif;if(level_low='1')theni2c_per_state<=ack;endif;whenack=>if(level_high='1')thenlink<='1'sda_buf<='1'-非应答位-i2c_per_state<=stop;endif;if(level_low='1')thenlink<='1'sda_buf<=

38、'0'i2c_per_state<=stop;endif;whenstop=>if(level_high='1')thenlink<='1'sda_buf<='1'-停止位endif;if(level_low='1')thenmain_state<="00"endif;whenothers=>null;endcase;whenothers=>null;endcase;whenothers=>null;endcase;endif;endprocess

39、state;-数据处理部分anly1:process(readdata_reg_buf)beginreaddata_ten<=conv_integer(readdata_reg_buf)*12;qian_0<=readdata_ten/1000;bai_0<=(readdata_ten/100)rem10;shi_0<=(readdata_ten/10)rem10;ge_0<=readdata_tenrem10;endprocessanly1;anly2:process(qian_0,bai_0,shi_0,ge_0)beginqian<=conv_std_

40、logic_vector(qian_0,4);bai<=conv_std_logic_vector(bai_0,4);shi<=conv_std_logic_vector(shi_0,4);ge<=conv_std_logic_vector(ge_0,4);endprocessanly2;-数码管显示部分scan:process(rst,clk)beginif(notrst='1')thencount<=(others=>'0');clk_slow<='0'elsif(clk'eventandclk=&

41、#39;1')thenif(count="11111011011111")thencount<=(others=>'0');clk_slow<=notclk_slow;elsecount<=count+'1'endif;endif;endprocessscan;seg1:process(clk_slow,rst)beginif(notrst='1')thenscan_num<="00"elsif(clk_slow'eventandclk_slow='1&

42、#39;)thenscan_num<="00"elsescan_num<=scan_num+'1'endif;endif;endprocesssegl;seg2:process(seg_data_buf)begincaseseg_data_bufiswhen"1111"=>seg_0<="10001110"when"1110"=>seg_0<="10000110"when"1101"=>seg_0<="

43、10100001"when"1100"=>seg_0<="11000110"when"1011"=>seg_0<="10000011"when"1010"=>seg_0<="10011000"when"1001"=>seg_0<="10010000"when"1000"=>seg_0<="10000000"when"0

44、111"=>seg_0<="11111000"when"0110"=>seg_0<="10000010"when"0101"=>seg_0<="10010010"when"0100"=>seg_0<="10011001"when"0011"=>seg_0<="10110000"when"0010"=>seg_0<=&

45、quot;10100100"when"0001"=>seg_0<="11111001"when"0000"=>seg_0<="11000000"whenothers=>seg_0<="11111111"endcase;endprocessseg2;seg0:process(scan_num)begincasescan_numiswhen"00"=>sel_0<="1110"seg_data_buf&

46、lt;=ge;when"01"=>sel_0<="1101"seg_data_buf<=shi;when"10"=>sel_0<="1011"seg_data_buf<=bai;when"11"=>sel_0<="0111"seg_data_buf<=qian;whenothers=>null;endcase;endprocessseg0;-数据缓存部分ss:process(clk,rst)beginif(notrs

47、t='1')thenclk_sslow<='0'counter<=(others=>'0');if(counter/="111111111111111111111110")thencounter<=counter+'1'elsecounter<=(others=>'0');clk_sslow<=notclk_sslow;endif;endif;endprocessss;buf:process(clk_sslow)beginif(clk_sslow'

48、;eventandclk_sslow='1')thenreaddata_reg_buf<=readdata_reg;elsereaddata_reg_buf<=readdata_reg_buf;endif;endprocessbuf;-蜂鸣器报警部分bep:process(clk,rst)variablecount:integerrange0to50000;-1KHz方波beginif(notrst='1')thencount:=0;beep_en<='0'elsif(clk'eventandclk='1'

49、;)thenif(beep_en='1')thencount:=count+1;if(count>50000) thencount:=0;beep_buf<=notbeep_buf;endif;elseif(noturv_1='1')thenif(readdata_reg>”0000000000000011")thenbeep_en<='1'endif;elsif(noturv_2='1')thenif(readdata_reg>”1111111111100000")thenbee

50、p_en<='1'endif;endif;endif;endif;endprocessbep;endarch_at24c08;(二)测试模块：libraryieee;useieee.std_logic_1164.all;useieee.std_logic_unsigned.all;useieee.std_logic_arith.all;entitytbis-null;endtb;architecturebehv_tboftbiscomponentat24c08clkinstd_logic;rst:instd_logic;scl:outstd_logic;sda :inou

51、tstd_logic;urv_1 :instd_logic;urv_2 :instd_logic;port(-时钟信号-复位信号-i2c时钟线-i2c数据线-上限值1-上限值2sel:outstd_logic_vector(3downto0);seg:outstd_logic_vector(7downto0);beep:outstd_logic-蜂鸣器输出信号线）；endcomponent;constantclockperiod:time:=20ns;signalclk_tb:std_logic:='0'signalrst_tb:std_logic;signalscl_tb:std_logic;signalsda_tb:std_logic;signalurv_1_tb:std_logic;signalurv_2_tb:std_logic;signalsel_tb:std_logic_vector(3downto0);signalseg_tb:std_logic_vector(7downto0);sign