实验五 数码管显示

1、实验五 数码管显示一、 实验目的1. 掌握用verilog HDL的编程方法七段数码管显示；2. 掌握七段数码管的使用；3. 掌握对设计电路进行仿真。二、 实验设备1. 安装Quartus II软件的计算机2. SmartEDA实验箱 三、 实验内容PART I : 数码管显示电路（基础）1. 实验原理数字钟电路的设计主要包含三个部分：1) 秒信号产生；2) 时钟计数，包括分和秒的计数；3) 数码管的动态显示，将分和秒同时用数码管显示出来。1) 秒信号的产生整个数字钟的基准时钟为核心板上所提供的48M晶振时钟，要将其转化成为秒时钟信号，需要对其进行计数分频。2) 时钟计数由秒信号作为计数时钟，

2、完成秒和分的计时。应分别由两个60进制的计数器来完成。3) 数码管的动态显示要将分和秒的信息用数码管显示出来。为了完整的显示信息，至少需要4根数码管。由于4 根数码管的段码是复用(共用)的，所以需要对数码管进行动态管理。即通过位码的选择，使得在某一时刻将段码用于某根数码管，另一时刻则将段码用于另一根数码管，经过一段时间后再重复刚才的步骤。则只要位码的切换速度足够快，由于人眼的视觉停留效应，相关的数码管在感觉上都是一直处于显示状态。2. 实验程序a) 秒信号的产生always (posedge clk) /定义clock上升沿触发begincount = count + 1b1;if(count

3、 = _)/0.5S到了吗？begincount = 25d0;/计数器清零sec = _;/置位秒标志endendb) 时钟计数always (negedge sec)/计时处理beginhour3:0 = _;/秒加1if(hour3:0 = 4ha)beginhour3:0 = _;hour7:4 = _;/秒的十位加一if(hour7:4 = _)beginhour7:4 = _;hour11:8 = hour11:8 + 1b1;/分个位加一if(hour11:8 = _)beginhour11:8 = _;hour15:12 = hour15:12 + 1b1;/分十位加一if(h

4、our15:12 = 4h6)hour15:12 =_;endendendendc) 数码管的动态显示/数码管动态扫描显示部分always (posedge clk) /count17:15大约1ms改变一次begincase(count17:15)/选择扫描显示数据3d0:disp_dat = _;/秒个位3d1:disp_dat = _;/秒十位3d2:disp_dat = 4ha;/显示-3d3:disp_dat = _;/分个位3d4:disp_dat = _;/分十位3d5:disp_dat = 4ha;/显示-3d6:disp_dat = 8h00;/时个位，本次实验不计小时3d7

5、:disp_dat = 8h00;/时十位，本次实验不计小时endcasecase(count17:15)/选择数码管显示位3d0:dig_r = _;/选择第一个数码管显示3d1:dig_r = _;/选择第二个数码管显示3d2:dig_r = _;/选择第三个数码管显示3d3:dig_r = _;/选择第四个数码管显示3d4:dig_r = _;/选择第五个数码管显示3d5:dig_r = 8b;/不显示3d6:dig_r = 8b;/不显示3d7:dig_r = 8b;/不显示endcaseendalways (posedge clk)begincase(_)4h0:seg_r = 8h

6、c0;/显示04h1:seg_r = 8hf9;/显示14h2:seg_r = 8ha4;/显示24h3:seg_r = 8hb0;/显示34h4:seg_r = 8h99;/显示44h5:seg_r = 8h92;/显示54h6:seg_r = 8h82;/显示64h7:seg_r = 8hf8;/显示74h8:seg_r = 8h80;/显示84h9:seg_r = 8h90;/显示94ha:seg_r = 8hbf;/显示-default:seg_r = 8hff;/不显示endcaseif(count17:15= 3d2)&sec)seg_r = 8hff;end3. 实验步骤a) 阅

7、读上述三部分代码，并完成空格处的代码填写。b) 将三部分代码组织在一起，再添加必要的代码段，完成完整的程序。c) 根据Quartus II的设计流程，实现数字钟，并观察现象。PART II : 音乐电路（兴趣）实验内容：解读所附代码，完成音乐演奏电路设计。/*/ 友谊地久天长乐曲 / 时钟：48MHz /*/音高与频率的对应关系/-/|1 | 2 | 3 | 4|5 | 6 | 7 |/|低音 |261.6Hz |293.7Hz |329.6Hz |349.2Hz | 392Hz | 440Hz |493.9Hz | /|中音 |523.3Hz |587.3Hz |659.3Hz |698.5

8、Hz | 784Hz | 880Hz |987.8Hz |/|高音 |1045.5Hz|1174.7Hz|1318.5Hz|1396.9Hz| 1568Hz | 1760Hz |1975.5Hz|/-modulesong(clk,beep);/模块名称songinputclk;/系统时钟48MHzoutputbeep;/蜂鸣器输出端reg beep_r;/寄存器reg7:0 state;/乐谱状态机reg15:0count,count_end;reg23:0count1;/乐谱参数:D=F/2K (D:参数,F:时钟频率,K:音高频率)parameter L_5 = 16d61224, /低音

9、5L_6 = 16d54545,/低音6M_1 = 16d45863,/中音1M_2 = 16d40865,/中音2M_3 = 16d36402,/中音3M_5 = 16d30612,/中音5M_6 = 16d27273,/中音6H_1 = 16d22956;/高音1parameterTIME = ;/控制每一个音的长短(250ms)assign beep = beep_r;/输出音乐always(posedge clk)begincount = count + 1b1;/计数器加1if(count = count_end)begincount = 16h0;/计数器清零beep_r = !b

10、eep_r;/输出取反endendalways (posedge clk)beginif(count1 TIME)/一个节拍250mScount1 = count1 + 1b1;elsebegincount1 = 24d0;if(state = 8d147)state = 8d0;elsestate = state + 1b1;case(state)8d0,8d1: count_end = L_5;/低音5,持续2个节拍8d2,8d3,8d4,8d5,8d6,8d7,8d8: count_end = M_1;/中音1,持续7个节拍8d9,8d10:count_end = M_3;/中音3,持续

11、2个节拍8d11,8d12,8d13,8d14: count_end = M_2;8d15: count_end = M_1;8d16,8d17: count_end = M_2;8d18,8d19: count_end = M_3;8d20,8d21,8d22,8d23,8d24: count_end = M_1;8d25,8d26: count_end = M_3;8d27,8d28: count_end = M_5;8d29,8d30,8d31,8d32,8d33:count_end = M_6;8d34,8d35,8d36,8d37,8d38: count_end = M_6;8d39

12、,8d40,8d41,8d42: count_end = M_5;8d43,8d44,8d45: count_end = M_3;8d46,8d47: count_end = M_1;8d48,8d49,8d50,8d51: count_end = M_2;8d52: count_end = M_1;8d53,8d54: count_end = M_2;8d55,8d56:count_end = M_3;8d57,8d58,8d59,8d60: count_end = M_1;8d61,8d62,8d63: count_end = L_6;8d64,8d65: count_end = M_5;

13、8d66,8d67,8d68,8d69:count_end = M_1;8d70,8d71,8d72,8d73: count_end = M_1;8d74,8d75: count_end = M_6;8d76,8d77,8d78,8d79: count_end = M_5;8d80,8d81,8d82: count_end = M_3;8d83,8d84: count_end = M_1;8d85,8d86,8d87,8d88: count_end = M_2;8d89: count_end = M_1;8d90,8d91: count_end = M_2;8d92,8d93: count_e

14、nd = M_6;8d94,8d95,8d96,8d97:count_end = M_5;8d98,8d99,8d100: count_end = M_3;8d101,8d102: count_end = M_5;8d103,8d104,8d105,8d106:count_end = M_6;8d107,8d108,8d109,8d110: count_end = M_6;8d111,8d112: count_end = H_1;8d113,8d114,8d115,8d116: count_end = M_5;8d117,8d118,8d119: count_end = M_3;8d120,8d121: count_end = M_1;8d122,8d123,8d124,8d125: count_end = M_2;8d126: count_end = M_1;8d127,8d128: count_end = M_2;8d129,8d130: count_end = M_3;8d131,8d132,8d133,8d134: count_end = M_1;8d135,8d136,8d137: co