本项目设计的目的在于提高组员自身对于verilog语言编写的能力提升，同时游戏功能的实现需要对多方面的有理解，每个模块的编写都能提升自身的能力。Flappy Bird作为一款当时风靡全球的游戏，其实现方式也较为简单，代码的编写灵活性也较大，实现方法多样。
项目想实现的功能是在1024*768分辨率下,游戏能基本实现图像的正常显示，能够正常从ROM中读取图片信息并通过VGA进行显示，通过key控制小鸟的飞行，当小鸟飞行碰到障碍物显示死亡，完成通关则显示通关，能够正常显示计分。需要编写合适的图像显示模块、积分模块、碰撞检测模块。
AX301开发板使用的是 ALERA 公司的 CYCLONE IV 系列 FPGA，型号为 EP4CE6F17C8，256个引脚的FBGA封装。
其中，主要的参数， 逻辑单元 LE：6272； 乘法器 LAB：392； RAM：276480bit； IO数量：179 个； 内核电压：1.15V-1.25V(推荐 1.2V); 工作温度：0-85℃ 图为整个系统的结构示意图：
VGA 接口是一种 D 型接口，上面共有 15 针孔，分成三排，每排五个。比较重要的是3根RGB彩色分量信号和2根扫描同步信号HSYNC和VSYNC针。
另外16bit 真彩色显示，可以显示 2^16=65536 种颜色，RGB 分别占的位数为 5：6：5 模式，也就是红色用 5 位、绿色用6 位、蓝色用5 位来表示
1. module VGA_Controller(
2. input clk,
3. input clr,
4. output reg vga_HS,
5. output reg vga_VS,
6. output reg [9:0] X,
7. output reg [9:0] Y,
8. output reg display
9. );
10.
11.
12. parameter H_color_scan=640;
13. parameter H_front_porch=16;
14. parameter H_synch_pulse=96;
15. parameter H_back_porch=48;
16. parameter H_scan_width=800;
17.
18.
19. parameter V_color_scan=480;
20. parameter V_front_porch=10;
21. parameter V_synch_pulse=2;
22. parameter V_back_porch=33;
23. parameter V_scan_width=525;
24.
25.
26. reg [9:0] V_pos,H_pos;
27.
28.
29. always @(posedge clk, negedge clr) begin
30. if (!clr) begin
31. H_pos <= 0;
32. V_pos <= 0;
33. end
34. else begin
35. if(H_pos < H_scan_width) begin
36. H_pos <= H_pos + 1;
37. end else begin
38. H_pos <= 0;
39.
40. if(V_pos < V_scan_width) begin
41. V_pos <= V_pos + 1;
42. end else begin
43. V_pos <= 0;
44. end
45.
46. end
47.
48.
49. if(H_pos > H_front_porch && H_pos < (H_front_porch+H_synch_pulse)) begin
50. vga_HS <= 1'b0;
51. end else begin
52. vga_HS <= 1'b1;
53. end
54.
55.
56. if(V_pos > V_front_porch && V_pos < (V_front_porch+V_synch_pulse)) begin
57. vga_VS <= 1'b0;
58. end else begin
59. vga_VS <= 1'b1;
60. end
61.
62.
63. if((H_pos > (H_front_porch + H_synch_pulse + H_back_porch))) begin
64. display <= 1'b1;
65. X <= H_pos - (H_front_porch + H_synch_pulse + H_back_porch -1) + 144;
66. Y <= V_pos - (V_front_porch + V_synch_pulse + V_back_porch -1);
67.
68. end else begin
69. display <= 1'b0;
70. X <= 0;
71. Y <= 0;
72. end
73. end
74.
75. end
76.
77. endmodule
此模块用于碰撞检测，当检测到像素重合则为碰撞，输出碰撞信号，为之后的模块控制提供判断信号。
通过if语句进行判断，若小鸟所占的像素在水管的像素内则说明发生了碰撞，输出game_end信号。
1. module Crash_Detect(
2. input clr,
3. input [9:0] bird_y_pos,
4. input [9:0] tube1_x_pos,
5. input [9:0] tube1_y_pos,
6. input [9:0] tube2_x_pos,
7. input [9:0] tube2_y_pos,
8. input [9:0] tube3_x_pos,
9. input [9:0] tube3_y_pos,
10. output game_end
11. );
12.
13. wire crash;
14.
15.
16. wire [9:0] bird_x_pos;
17. assign bird_x_pos = 10'd180;
18.
19. assign crash = (
20. (((bird_y_pos + 10'd15 >= tube1_y_pos + 10'd50) | (bird_y_pos - 10'd15 <= tube1_y_pos - 10'd50)) &
21. ((bird_x_pos + 10'd15 >= tube1_x_pos - 10'd30) & (bird_x_pos - 10'd15 <= tube1_x_pos + 10'd30))) |
22. (((bird_y_pos + 10'd15 >= tube2_y_pos + 10'd50) | (bird_y_pos -10'd15 <= tube2_y_pos - 10'd50)) &
23. ((bird_x_pos + 10'd15 >= tube2_x_pos - 10'd30) & (bird_x_pos - 10'd15 <= tube2_x_pos + 10'd30))) |
24. (((bird_y_pos + 10'd15 >= tube3_y_pos + 10'd50) | (bird_y_pos - 10'd15 <= tube3_y_pos - 10'd50)) &
25. ((bird_x_pos + 10'd15 >= tube3_x_pos - 10'd30) & (bird_x_pos - 10'd15 <= tube3_x_pos + 10'd30)))
26. );
27.
28.
29. assign game_end =
30. (!clr) ? 0:
31. (crash) ? 1:
32. 0;
33.
34. endmodule
此模块生成水管的位置信息，包括横坐标和纵坐标。
通过random模块的调用，实现随机初始纵坐标的生成，其横坐标会根据分频时钟的变化而以此向左移动，实现水管的左移。
1. module Draw_Tubes(
2. input clk10,
3. input clr,
4. input game_end,
5. output reg [9:0] tube1_y_pos,
6. output reg [9:0] tube2_y_pos,
7. output reg [9:0] tube3_y_pos,
8. output reg [9:0] tube1_x_pos,
9. output reg [9:0] tube2_x_pos,
10. output reg [9:0] tube3_x_pos,
11. output reg [7:0] score
12. );
13.
14. wire [6:0] rand;
15. reg [9:0] randconv;
16.
17. random_gen pipe_gen(
18. .clk(clk10),
19. .out(rand)
20. );
21.
22. always @ (posedge clk10, negedge clr) begin
23. if (!clr) begin
24. score <= 8'b0;
25. tube1_x_pos <= 10'd404;
26. tube2_x_pos <= 10'd664;
27. tube3_x_pos <= 10'd904;
28. tube1_y_pos <= 10'd240;
29. tube2_y_pos <= 10'd180;
30. tube3_y_pos <= 10'd200;
31. end
32. else if (~game_end) begin
33.
34. randconv <= rand + 10'd150;
35. tube1_x_pos <= tube1_x_pos - 10'd5;
36. tube2_x_pos <= tube2_x_pos - 10'd5;
37. tube3_x_pos <= tube3_x_pos - 10'd5;
38. if (tube1_x_pos <= 10'd114) begin
39. tube1_x_pos <= 10'd904;
40. tube1_y_pos <= randconv;
41. score <= score + 8'd1;
42. end
43. if (tube2_x_pos <= 10'd114) begin
44. tube2_x_pos <= 10'd904;
45. tube2_y_pos <= randconv;
46. score <= score + 8'd1;
47. end
48. if (tube3_x_pos <= 10'd114) begin
49. tube3_x_pos <= 10'd904;
50. tube3_y_pos <= randconv;
51. score <= score + 8'd1;
52. end
53. end
54. end
55.
56. endmodule
此模块用于生成一个随机数，用于Draw Tube模块的调用。
Rand初始值为~(20'b0),feed0和feed1通过rand的异或进行赋值，rand又进行左移，feed0和feed1补位，实现随机数的生成。
1. module random_gen(
2. input clk,
3. output reg [6:0] out
4. );
5.
6. reg [20:0] rand;
7. initial rand = ~(20'b0);
8. reg [20:0] rand_next;
9. wire feed0;
10. wire feed1;
11.
12. assign feed0 = rand[20] ^ rand[15];
13. assign feed1 = rand[0] ^ rand [8];
14.
15. always @ (posedge clk)
16. begin
17. rand <= rand_next;
18. out = rand[6:0];
19. end
20.
21. always @ (*)
22. begin
23. rand_next = {rand[18:0], feed0, feed1};
24. end
25.
26. endmodule
此模块用于Bird的位置信息生成。
Bird的横坐标不需要变化，因此只需对纵坐标进行变换，当检测到按键信息，bird的纵坐标就上移6个像素，否则下降6个像素。
1. module Draw_Bird(
2. input clk10,
3. input clr,
4. input game_end,
5. input up,
6. input down,
7. output reg [9:0] bird_y_pos
8. );
9.
10.
11. always @ (posedge clk10, negedge clr)
12. begin
13. if (!clr)
14. bird_y_pos <= 10'd70;
15. else if (~game_end)
16. begin
17. if ((up == 1) && (bird_y_pos >= 10'd15))
18. bird_y_pos <= bird_y_pos - 10'd6;
19. if ((down == 1) && (bird_y_pos <= 10'd465))
20. bird_y_pos <= bird_y_pos + 10'd6;
21. else if (bird_y_pos >=10'd466)
22. bird_y_pos <= 10'd465;
23. else if (bird_y_pos <=10'd14)
24. bird_y_pos <= 10'd15;
25. end
26. end
27.
28. endmodule
此模块用于在FPGA开发板上实时显示分数情况。
Score用于读取分数信息，通过计算得到各位数值进行赋值，sel作为数码管选择函数，数码管显示通过动态扫描的方式，再经过段选进行显示。
1. module SevenSegScoreDisplay(
2. input clk,
3. input [7:0] score,
4. output reg [2:0]sel,
5. output reg [6:0]DIG
6. );
7.
8.
9. wire [6:0] HEX2, HEX1, HEX0;
10. reg [3:0] dig_2;
11. reg [3:0] dig_1;
12. reg [3:0] dig_0;
13.
14. always @ (posedge clk)
15. begin
16. dig_2 <= score / 8'd100; // score/100
17. dig_1 <= (score / 8'd10) % 8'd10; // (score/10)%10
18. dig_0 <= score % 8'd10; // score%10
19. end
20.
21. reg [9:0] select = 0;
22. always@(posedge clk)
23. begin
24. if(select>=0&select<10'b0010000000)
25. begin
26. DIG=HEX0;
27. sel=3'b011;
28. select=select+1;
29. end
30.
31. if(select>=10'b0010000000&select<10'b0100000000)
32. begin
33. DIG=HEX1;
34. sel=3'b101;
35. select=select+1;
36. end
37. if(select>=10'b0100000000&select<10'b1000000000)
38. begin
39. DIG=HEX2;
40. sel=3'b110;
41. select=select+1;
42. end
43. if(select==10'b1000000000) select=0;
44.
45. end
46.
47. dec_decoder D0(
48. .dec_digit(dig_0),
49. .segments(HEX0)
50. );
51.
52. dec_decoder D1(
53. .dec_digit(dig_1),
54. .segments(HEX1)
55. );
56.
57. dec_decoder D2(
58. .dec_digit(dig_2),
59. .segments(HEX2)
60. );
61.
62.
63.
64. endmodule
65.
66. module dec_decoder(dec_digit, segments);
67. input [3:0] dec_digit;
68. output reg [6:0] segments;
69.
70. always @(*)
71. case (dec_digit)
72. 4'd0: segments = 7'b1000000;
73. 4'd1: segments = 7'b1111001;
74. 4'd2: segments = 7'b0100100;
75. 4'd3: segments = 7'b0110000;
76. 4'd4: segments = 7'b0011001;
77. 4'd5: segments = 7'b0010010;
78. 4'd6: segments = 7'b0000010;
79. 4'd7: segments = 7'b1111000;
80. 4'd8: segments = 7'b0000000;
81. 4'd9: segments = 7'b0011000;
82. default: segments = 7'b0;
83. endcase
84. endmodule
在屏幕上显示各个图像，包括水管、鸟、背景、死后分数
鸟通过调用BirdRom模块，每个像素读取一位，而显示出图像。
水管通过对对水管位置信息的调用，进行左右扩大，对输出赋值。
背景通过对不同区域的赋值产生不同的颜色。
死亡后分数显示通过读取score的值，计算得出各位数值，调用预设信息，在屏幕上显示分数。
1. module VGA_Bitgen(
2. input clk,
3. input bright,
4. input [9:0] x,
5. input [9:0] y,
6. input [9:0] bird_y_pos,
7. input [9:0] tube1_x_pos,
8. input [9:0] tube1_y_pos,
9. input [9:0] tube2_x_pos,
10. input [9:0] tube2_y_pos,
11. input [9:0] tube3_x_pos,
12. input [9:0] tube3_y_pos,
13. input game_end,
14. input [4:0]re,
15. input [5:0]gr,
16. input [4:0]bl,
17. output reg [10:0]add,
18. input [7:0] score,
19. output reg [4:0] red,
20. output reg [5:0] green,
21. output reg [4:0] blue
22. );
23.
24.
25. wire [9:0] bird_x_pos;
26. assign bird_x_pos = 10'd180;
27.
28. reg [5:0] flag=1;
29. reg [5:0] flagy=1;
30. reg [3:0] dig_2;
31. reg [3:0] dig_1;
32. reg [3:0] dig_0;
33. reg Dig0Seg0, Dig0Seg1, Dig0Seg2, Dig0Seg3, Dig0Seg4, Dig0Seg5, Dig0Seg6;
34. reg Dig1Seg0, Dig1Seg1, Dig1Seg2, Dig1Seg3, Dig1Seg4, Dig1Seg5, Dig1Seg6;
35. reg Dig2Seg0, Dig2Seg1, Dig2Seg2, Dig2Seg3, Dig2Seg4, Dig2Seg5, Dig2Seg6;
36. reg digit_display_2, digit_display_1, digit_display_0;
37.
38. always @ (posedge clk) begin
39.
40. if (~game_end)
41. begin
42. if (~bright)
43. begin
44. red = 5'b0;
45. green = 6'b0;
46. blue = 5'b0;
47. end
48. else if ((x == bird_x_pos - 10'd20+flag) && (y == bird_y_pos - 10'd20+flagy))
49. begin
50. add=40*(flagy-1)+flag;
51. red = re;
52. green = gr;
53. blue = bl;
54. if(flag<=40)
55. flag=flag+1;
56. else if(flagy<=40)
57. begin
58. flag=0;
59. flagy=flagy+1;
60. end
61. else flagy=0;
62. end
63. else if (
64. ((x >= tube1_x_pos - 10'd30) && (x <= tube1_x_pos + 10'd30) && ((y >= tube1_y_pos + 10'd50) || (y <= tube1_y_pos - 10'd50))) ||
65. ((x >= tube2_x_pos - 10'd30) && (x <= tube2_x_pos + 10'd30) && ((y >= tube2_y_pos + 10'd50) || (y <= tube2_y_pos - 10'd50))) ||
66. ((x >= tube3_x_pos - 10'd30) && (x <= tube3_x_pos + 10'd30) && ((y >= tube3_y_pos + 10'd50) || (y <= tube3_y_pos - 10'd50)))
67. )
68. begin
69. red = 5'b0;
70. green = 6'b111111;//绿色水管
71. blue = 5'b0;
72. end
73. else if (
74. ((x >= tube1_x_pos + 10'd39) && (x <= tube1_x_pos + 10'd80) && ((y >= 10'd30) && (y <= 10'd50))) ||
75. ((x >= tube2_x_pos + 10'd40) && (x <= tube2_x_pos + 10'd93) && ((y >= 10'd30) && (y <= 10'd45))) ||
76. ((x >= tube3_x_pos + 10'd37) && (x <= tube3_x_pos + 10'd85) && ((y >= 10'd12) && (y <= 10'd23)))
77. )
78. begin
79. red = 5'b00011;
80. green = 6'b111111;//白云1
81. blue = 5'b11111;
82. end
83. else if (
84. ((x >= tube1_x_pos + 10'd39) && (x <= tube1_x_pos + 10'd58) && ((y >= 10'd13) && (y <= 10'd30))) ||
85. ((x >= tube2_x_pos + 10'd60) && (x <= tube2_x_pos + 10'd77) && ((y >= 10'd15) && (y <= 10'd30))) ||
86. ((x >= tube3_x_pos + 10'd50) && (x <= tube3_x_pos + 10'd70) && ((y >= 10'd3) && (y <= 10'd12)))
87. )
88. begin
89. red = 5'b00011;
90. green = 6'b111111;//白云2
91. blue = 5'b11111;
92. end
93. else if(y>=400)
94. begin
95. red=5'b01001;
96. green=6'b0;
97. blue=5'b00010;//地面
98. end
99. else
100. begin
101. red = 5'b11111;
102. green = 6'b111111;
103. blue = 5'b11111;//蓝色背景
104. end
105. end
106.
107. else begin
108.
109. dig_2 = score / 8'd100;
110. dig_1 = (score / 8'd10) % 8'd10;
111. dig_0 = score % 8'd10;
112.
113.
114. Dig0Seg0 = ((x >= 10'd559) & (x <= 10'd609) & (y >= 10'd160) & (y <= 10'd170));
115. Dig0Seg1 = ((x >= 10'd614) & (x <= 10'd624) & (y >= 10'd160) & (y <= 10'd237));
116. Dig0Seg2 = ((x >= 10'd614) & (x <= 10'd624) & (y >= 10'd243) & (y <= 10'd320));
117. Dig0Seg3 = ((x >= 10'd559) & (x <= 10'd609) & (y >= 10'd310) & (y <= 10'd320));
118. Dig0Seg4 = ((x >= 10'd544) & (x <= 10'd554) & (y >= 10'd243) & (y <= 10'd320));
119. Dig0Seg5 = ((x >= 10'd544) & (x <= 10'd554) & (y >= 10'd160) & (y <= 10'd237));
120. Dig0Seg6 = ((x >= 10'd559) & (x <= 10'd609) & (y >= 10'd235) & (y <= 10'd245));
121.
122. Dig1Seg0 = ((x + 10'd120 >= 10'd559) & (x + 10'd120 <= 10'd609) & (y >= 10'd160) & (y <= 10'd170));
123. Dig1Seg1 = ((x + 10'd120 >= 10'd614) & (x + 10'd120 <= 10'd624) & (y >= 10'd160) & (y <= 10'd237));
124. Dig1Seg2 = ((x + 10'd120 >= 10'd614) & (x + 10'd120 <= 10'd624) & (y >= 10'd243) & (y <= 10'd320));
125. Dig1Seg3 = ((x + 10'd120 >= 10'd559) & (x + 10'd120 <= 10'd609) & (y >= 10'd310) & (y <= 10'd320));
126. Dig1Seg4 = ((x + 10'd120 >= 10'd544) & (x + 10'd120 <= 10'd554) & (y >= 10'd243) & (y <= 10'd320));
127. Dig1Seg5 = ((x + 10'd120 >= 10'd544) & (x + 10'd120 <= 10'd554) & (y >= 10'd160) & (y <= 10'd237));
128. Dig1Seg6 = ((x + 10'd120 >= 10'd559) & (x + 10'd120 <= 10'd609) & (y >= 10'd235) & (y <= 10'd245));
129.
130. Dig2Seg0 = ((x + 10'd240 >= 10'd559) & (x + 10'd240 <= 10'd609) & (y >= 10'd160) & (y <= 10'd170));
131. Dig2Seg1 = ((x + 10'd240 >= 10'd614) & (x + 10'd240 <= 10'd624) & (y >= 10'd160) & (y <= 10'd237));
132. Dig2Seg2 = ((x + 10'd240 >= 10'd614) & (x + 10'd240 <= 10'd624) & (y >= 10'd243) & (y <= 10'd320));
133. Dig2Seg3 = ((x + 10'd240 >= 10'd559) & (x + 10'd240 <= 10'd609) & (y >= 10'd310) & (y <= 10'd320));
134. Dig2Seg4 = ((x + 10'd240 >= 10'd544) & (x + 10'd240 <= 10'd554) & (y >= 10'd243) & (y <= 10'd320));
135. Dig2Seg5 = ((x + 10'd240 >= 10'd544) & (x + 10'd240 <= 10'd554) & (y >= 10'd160) & (y <= 10'd237));
136. Dig2Seg6 = ((x + 10'd240 >= 10'd559) & (x + 10'd240 <= 10'd609) & (y >= 10'd235) & (y <= 10'd245));
137.
138.
139. case (dig_2)
140. 8'd0: digit_display_2 = (Dig2Seg0 | Dig2Seg1 | Dig2Seg2 | Dig2Seg3 | Dig2Seg4 | Dig2Seg5);
141. 8'd1: digit_display_2 = (Dig2Seg1 | Dig2Seg2);
142. 8'd2: digit_display_2 = (Dig2Seg0 | Dig2Seg1 | Dig2Seg6 | Dig2Seg4 | Dig2Seg3);
143. 8'd3: digit_display_2 = (Dig2Seg0 | Dig2Seg1 | Dig2Seg6 | Dig2Seg2 | Dig2Seg3);
144. 8'd4: digit_display_2 = (Dig2Seg5 | Dig2Seg6 | Dig2Seg1 | Dig2Seg2);
145. 8'd5: digit_display_2 = (Dig2Seg0 | Dig2Seg5 | Dig2Seg6 | Dig2Seg2 | Dig2Seg3);
146. 8'd6: digit_display_2 = (Dig2Seg0 | Dig2Seg5 | Dig2Seg6 | Dig2Seg2 | Dig2Seg3 | Dig2Seg4);
147. 8'd7: digit_display_2 = (Dig2Seg0 | Dig2Seg1 | Dig2Seg2);
148. 8'd8: digit_display_2 = (Dig2Seg0 | Dig2Seg1 | Dig2Seg2 | Dig2Seg3 | Dig2Seg4 | Dig2Seg5 | Dig2Seg6);
149. 8'd9: digit_display_2 = (Dig2Seg0 | Dig2Seg5 | Dig2Seg6 | Dig2Seg1 | Dig2Seg2 | Dig2Seg3);
150. default: digit_display_2 = 1'b0;
151. endcase
152.
153. case (dig_1)
154. 8'd0: digit_display_1 = (Dig1Seg0 | Dig1Seg1 | Dig1Seg2 | Dig1Seg3 | Dig1Seg4 | Dig1Seg5);
155. 8'd1: digit_display_1 = (Dig1Seg1 | Dig1Seg2);
156. 8'd2: digit_display_1 = (Dig1Seg0 | Dig1Seg1 | Dig1Seg6 | Dig1Seg4 | Dig1Seg3);
157. 8'd3: digit_display_1 = (Dig1Seg0 | Dig1Seg1 | Dig1Seg6 | Dig1Seg2 | Dig1Seg3);
158. 8'd4: digit_display_1 = (Dig1Seg5 | Dig1Seg6 | Dig1Seg1 | Dig1Seg2);
159. 8'd5: digit_display_1 = (Dig1Seg0 | Dig1Seg5 | Dig1Seg6 | Dig1Seg2 | Dig1Seg3);
160. 8'd6: digit_display_1 = (Dig1Seg0 | Dig1Seg5 | Dig1Seg6 | Dig1Seg2 | Dig1Seg3 | Dig1Seg4);
161. 8'd7: digit_display_1 = (Dig1Seg0 | Dig1Seg1 | Dig1Seg2);
162. 8'd8: digit_display_1 = (Dig1Seg0 | Dig1Seg1 | Dig1Seg2 | Dig1Seg3 | Dig1Seg4 | Dig1Seg5 | Dig1Seg6);
163. 8'd9: digit_display_1 = (Dig1Seg0 | Dig1Seg5 | Dig1Seg6 | Dig1Seg1 | Dig1Seg2 | Dig1Seg3);
164. default: digit_display_1 = 1'b0;
165. endcase
166.
167. case (dig_0)
168. 8'd0: digit_display_0 = (Dig0Seg0 | Dig0Seg1 | Dig0Seg2 | Dig0Seg3 | Dig0Seg4 | Dig0Seg5);
169. 8'd1: digit_display_0 = (Dig0Seg1 | Dig0Seg2);
170. 8'd2: digit_display_0 = (Dig0Seg0 | Dig0Seg1 | Dig0Seg6 | Dig0Seg4 | Dig0Seg3);
171. 8'd3: digit_display_0 = (Dig0Seg0 | Dig0Seg1 | Dig0Seg6 | Dig0Seg2 | Dig0Seg3);
172. 8'd4: digit_display_0 = (Dig0Seg5 | Dig0Seg6 | Dig0Seg1 | Dig0Seg2);
173. 8'd5: digit_display_0 = (Dig0Seg0 | Dig0Seg5 | Dig0Seg6 | Dig0Seg2 | Dig0Seg3);
174. 8'd6: digit_display_0 = (Dig0Seg0 | Dig0Seg5 | Dig0Seg6 | Dig0Seg2 | Dig0Seg3 | Dig0Seg4);
175. 8'd7: digit_display_0 = (Dig0Seg0 | Dig0Seg1 | Dig0Seg2);
176. 8'd8: digit_display_0 = (Dig0Seg0 | Dig0Seg1 | Dig0Seg2 | Dig0Seg3 | Dig0Seg4 | Dig0Seg5 | Dig0Seg6);
177. 8'd9: digit_display_0 = (Dig0Seg0 | Dig0Seg5 | Dig0Seg6 | Dig0Seg1 | Dig0Seg2 | Dig0Seg3);
178. default: digit_display_0 = 1'b0;
179. endcase
180.
181.
182. if (digit_display_2 | digit_display_1 | digit_display_0)
183. begin
184.
185. red = 8'b11111111;
186. green = 8'b11111111;
187. blue = 8'b11111111;
188. end
189. else
190. begin
191.
192. red = 8'b00000000;
193. green = 8'b00000000;
194. blue = 8'b00000000;
195. end
196. end
197. end
198. //死亡后分数显示
199. endmodule
分频器模块，将50MHz的频率分频成20Hz的频率，用于按键控制的时钟信号。
通过计数器，将50MHz频率进行分频。
1. module SignalFrequency(
2.
3. input clk,
4. output reg clk10
5. );
6.
7. reg [22:0] count;
8.
9. initial
10. begin
11. count = 0;
12. clk10 = 1;
13. end
14.
15. always @ (posedge clk) begin
16. begin
17. count <= count + 1;
18. if (count == 2500000) begin
19. count <= 0;
20. clk10 <= ~clk10;
21. end
22. end
23. end
24.
25. endmodule
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